Life Sciences November Exam P1 (Hard)
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Questions and Answers

What is the primary purpose of photosynthesis?

  • Produce carbon dioxide
  • Convert light energy into glucose (correct)
  • Release oxygen into the atmosphere
  • Generate heat for the plant

Where do the light-dependent reactions of photosynthesis take place?

  • Thylakoids within chloroplasts (correct)
  • Nucleus
  • Mitochondria
  • Cytoplasm

What is the role of chlorophyll in photosynthesis?

  • To release oxygen into the atmosphere
  • To absorb and convert light energy into chemical energy (correct)
  • To provide heat for the plant
  • To store glucose in the plant

During photosynthesis, where are protons (H⁺ ions) pumped to during the light-dependent reactions?

<p>Protons are pumped into the thylakoid space (D)</p> Signup and view all the answers

What are the two main stages of photosynthesis?

<p>Light-dependent reactions and Light-independent reactions (A)</p> Signup and view all the answers

What happens to electrons in chlorophyll molecules during photosynthesis?

<p>They are excited and initiate the photosynthetic process (B)</p> Signup and view all the answers

Where does the synthesis of ATP occur in chloroplasts?

<p>Stroma (C)</p> Signup and view all the answers

Which structure within a chloroplast is responsible for capturing light energy?

<p>Thylakoid (D)</p> Signup and view all the answers

What is the primary end product of photosynthesis?

<p>Glucose (C)</p> Signup and view all the answers

Which organelle is responsible for conducting photosynthesis in plant cells?

<p>Chloroplast (C)</p> Signup and view all the answers

What is the role of NADPH in photosynthesis?

<p>Serve as a high-energy electron carrier (D)</p> Signup and view all the answers

Which enzyme is essential for fixing carbon dioxide during the light-independent reactions of photosynthesis?

<p>RuBisCO (B)</p> Signup and view all the answers

What is the primary function of grana in chloroplasts?

<p>Capture light energy (B)</p> Signup and view all the answers

What is the source of energy for converting carbon dioxide into carbohydrates during photosynthesis?

<p>Light energy (C)</p> Signup and view all the answers

Which component of chloroplasts provides structural support to thylakoid membranes?

<p>Lamella (C)</p> Signup and view all the answers

What is the role of chlorophyll in photosynthesis?

<p>Capture light energy (C)</p> Signup and view all the answers

What is the primary end product of photosynthesis?

<p>Glucose (A)</p> Signup and view all the answers

In which organelle does the light-independent phase of photosynthesis take place?

<p>Chloroplasts (D)</p> Signup and view all the answers

What happens to atmospheric oxygen levels if photosynthesis does not occur?

<p>They decrease, jeopardizing the survival of aerobic life forms (A)</p> Signup and view all the answers

What is the role of photosynthesis in maintaining the balance of atmospheric gases?

<p>Absorb carbon dioxide and release oxygen (D)</p> Signup and view all the answers

Which phase of photosynthesis requires radiant energy for its processes?

<p>Light-dependent phase (D)</p> Signup and view all the answers

What is the process through which carbon dioxide is converted into carbohydrates in plants?

<p>Photosynthesis (B)</p> Signup and view all the answers

Which molecules undergo a transformative journey leading to the production of carbohydrates in photosynthesis?

<p>Carbon dioxide and hydrogen ions (B)</p> Signup and view all the answers

What ecological implications are associated with the significance of photosynthesis in the biosphere?

<p>Balancing atmospheric gases (C)</p> Signup and view all the answers

What is the main function of excess glucose produced in photosynthesis?

<p>Store energy in the form of starch (B)</p> Signup and view all the answers

Which compound is considered the ultimate energy source for life on Earth according to the text?

<p>Glucose (D)</p> Signup and view all the answers

What environmental factors primarily influence the rate of photosynthesis?

<p>Intensity of light, concentration of carbon dioxide (CO2), and temperature (C)</p> Signup and view all the answers

What is the function of starch granules in chloroplasts?

<p>Store glucose produced during photosynthesis (B)</p> Signup and view all the answers

What happens to the rate of photosynthesis as light intensity increases?

<p>Increases until an optimal point is reached, then plateaus (A)</p> Signup and view all the answers

Which molecules serve as the primary receptors of sunlight energy in chloroplasts during photosynthesis?

<p>Chlorophyll pigments (B)</p> Signup and view all the answers

What is a consequence of excessive light intensity in photosynthesis?

<p>Damage to photosynthetic apparatus (D)</p> Signup and view all the answers

What is the main function of the double membrane surrounding chloroplasts?

<p>Protect the chloroplast from damage and regulate substance passage (D)</p> Signup and view all the answers

How does photosynthetic rate respond to increasing carbon dioxide (CO2) concentration?

<p>Increases until a certain point, then levels off (A)</p> Signup and view all the answers

Which phase of photosynthesis involves the assimilation of carbon dioxide and synthesis of carbohydrates?

<p>Calvin cycle (C)</p> Signup and view all the answers

What can happen if carbon dioxide concentrations exceed the optimum level for photosynthesis?

<p>Reduced photosynthetic efficiency due to limited gas exchange (D)</p> Signup and view all the answers

What is the significance of photolysis in photosynthesis?

<p>Generates oxygen and hydrogen ions (C)</p> Signup and view all the answers

Where does the synthesis of carbohydrates occur in chloroplasts?

<p>Stroma (D)</p> Signup and view all the answers

How does temperature influence photosynthetic rates?

<p>Leads to increased rates progressively until an optimal point (C)</p> Signup and view all the answers

What can occur if temperatures exceed the optimum level for photosynthesis?

<p>Impaired photosynthetic function and diminished rates (A)</p> Signup and view all the answers

What is the role of ATP in photosynthesis?

<p>Molecular reservoir of energy for biochemical processes (A)</p> Signup and view all the answers

What do greenhouses provide for optimal photosynthesis?

<p>Controlled environments (C)</p> Signup and view all the answers

Which structure within chloroplasts encodes essential genes for photosynthesis?

<p>Chloroplast DNA (D)</p> Signup and view all the answers

What do chlorophyll pigments capture during photosynthesis?

<p>Sunlight energy (C)</p> Signup and view all the answers

Which of the following is NOT a primary factor influencing the rate of photosynthesis?

<p>Concentration of oxygen (A)</p> Signup and view all the answers

At what point does photosynthetic rate reach an optimal level with increasing light intensity?

<p>At a point where maximal photosynthetic activity is achieved (A)</p> Signup and view all the answers

Which of the following is a key function of photosynthesis in plant cells?

<p>Converting radiant energy into chemical energy (D)</p> Signup and view all the answers

Which type of teeth in animals is specialized for catching, holding, tearing, and sometimes killing prey?

<p>Canines (C)</p> Signup and view all the answers

Which type of teeth are located behind canines and before molars?

<p>Premolars (C)</p> Signup and view all the answers

What is the function of carnassial teeth in animals?

<p>Used for cutting meat (C)</p> Signup and view all the answers

Which type of teeth are characterized by being flat and uneven and used for grinding and crushing food?

<p>Molars (C)</p> Signup and view all the answers

What does the human dental formula 2.1.2.3 indicate?

<p>2 incisors, 1 canine, 2 premolars, and 3 molars (D)</p> Signup and view all the answers

Which type of teeth are used for cutting plant material in herbivores?

<p>Incisors (D)</p> Signup and view all the answers

What type of diet is indicated by the presence of specialized carnassial teeth?

<p>Carnivorous diet (B)</p> Signup and view all the answers

In humans, what is the function of saliva released by the salivary glands in the mouth cavity?

<p>Chemically breaks down carbohydrates (C)</p> Signup and view all the answers

Which human digestive organ is responsible for carrying the bolus to the stomach through peristalsis?

<p>Oesophagus (A)</p> Signup and view all the answers

What is the primary function of premolars in animals?

<p>Grinding and crushing (C)</p> Signup and view all the answers

What is the primary function of the liver in the digestive system?

<p>Neutralization of stomach acid with the help of bile (D)</p> Signup and view all the answers

Which organ is responsible for the secretion of enzymes that digest carbohydrates, proteins, and lipids in the digestive system?

<p>Pancreas (B)</p> Signup and view all the answers

What is the function of the colon in the digestive process?

<p>Absorption of water and mineral salts (D)</p> Signup and view all the answers

Which process involves the physical breakdown of food primarily through mastication and peristalsis?

<p>Mechanical Digestion (D)</p> Signup and view all the answers

What occurs primarily in the small intestine where nutrients are absorbed into the bloodstream or lymphatic system?

<p>Assimilation (D)</p> Signup and view all the answers

Which statement describes how villi in the small intestine contribute to the digestive process?

<p>They absorb nutrients and increase surface area for absorption (C)</p> Signup and view all the answers

What is the purpose of destarching a plant before investigations into photosynthesis?

<p>To ensure accurate test results (A)</p> Signup and view all the answers

In the Starch Test investigation, why is the leaf subjected to boiling water and ethanol treatment?

<p>To extract chlorophyll (C)</p> Signup and view all the answers

What is the purpose of the aluminum foil in the Light Requirement investigation for photosynthesis?

<p>To obstruct light access to part of the leaf (B)</p> Signup and view all the answers

Which investigative approach demonstrates the importance of chlorophyll in photosynthesis?

<p>Investigation 4: Chlorophyll Requirement (C)</p> Signup and view all the answers

What occurs during the glowing splint test to confirm oxygen production in photosynthesis?

<p>The splint ignites again (C)</p> Signup and view all the answers

Why is sodium bicarbonate used in Investigation 3: Carbon Dioxide Requirement for Photosynthesis?

<p>To release carbon dioxide (A)</p> Signup and view all the answers

What does the blue-black coloration in the iodine-stained leaf indicate in the Starch Test investigation?

<p>Presence of starch (B)</p> Signup and view all the answers

How do investigations into photosynthesis provide insights into the biochemical processes involved?

<p>By analyzing plant responses to environmental variables (A)</p> Signup and view all the answers

What does the destarching process involve before investigations into photosynthesis?

<p>Subjecting the plant to darkness for 48 hours (D)</p> Signup and view all the answers

How does the destarching process ensure accurate results in investigating photosynthesis?

<p>By removing interfering variables (C)</p> Signup and view all the answers

What is the purpose of the absorption of radiant energy by chlorophyll in photosynthesis?

<p>To excite electrons within chlorophyll molecules (D)</p> Signup and view all the answers

In the light-dependent reactions of photosynthesis, where are protons (H⁺ ions) pumped to?

<p>Thylakoid space (A)</p> Signup and view all the answers

What fuels the pumping of protons (H⁺ ions) from the stroma into the thylakoid space in photosynthesis?

<p>Light energy absorbed by chlorophyll (A)</p> Signup and view all the answers

What is the fate of the energy released as electrons move along the electron transport chain during photosynthesis?

<p>It is utilized to pump protons across the thylakoid membrane (C)</p> Signup and view all the answers

What is the main function of the thylakoids in the process of photosynthesis?

<p>To provide a location for the light-dependent reactions (C)</p> Signup and view all the answers

How does the excited state of electrons contribute to the photosynthetic process?

<p>By facilitating the movement of protons across thylakoid membrane (D)</p> Signup and view all the answers

What is the primary function of grana in chloroplasts?

<p>Storage of ATP and NADPH (A)</p> Signup and view all the answers

During the light-independent reactions of photosynthesis, what is the role of the stroma?

<p>Energy conversion into carbohydrates (D)</p> Signup and view all the answers

In the chloroplast, which structure is responsible for the capture of light energy during photosynthesis?

<p>Lamella (A)</p> Signup and view all the answers

What are the primary end products of the light-dependent reactions during photosynthesis?

<p>Glucose and oxygen (A)</p> Signup and view all the answers

Which organelle facilitates the synthesis of adenosine triphosphate (ATP) and NADPH during photosynthesis?

<p>Lysosome (B)</p> Signup and view all the answers

What is the primary role of lamellae in a chloroplast?

<p>Fixation of carbon dioxide (A)</p> Signup and view all the answers

Which component of the chloroplast serves as the primary site for the light-dependent reactions of photosynthesis?

<p>Lamella (C)</p> Signup and view all the answers

What is the primary function of thylakoids in chloroplasts?

<p>Structural support to grana (A)</p> Signup and view all the answers

Which of the following structures within a chloroplast are essential for energy generation during photosynthesis?

<p>Stroma (C)</p> Signup and view all the answers

What is the primary role of a granum (grana) within a chloroplast?

<p>Facilitation of light capture (B)</p> Signup and view all the answers

What is the primary role of the double membrane surrounding chloroplasts?

<p>To regulate the passage of substances into and out of the chloroplast (C)</p> Signup and view all the answers

During the light-dependent phase of photosynthesis, what is the primary purpose of photolysis?

<p>To produce oxygen and hydrogen ions (C)</p> Signup and view all the answers

In which phase of photosynthesis does the Calvin cycle, also known as the light-independent phase, take place?

<p>Darkened phase (D)</p> Signup and view all the answers

What is the function of starch granules within the chloroplasts?

<p>To store glucose molecules from photosynthesis (A)</p> Signup and view all the answers

Which organelle contains its own circular DNA molecules and encodes essential genes for photosynthesis?

<p>Chloroplast (C)</p> Signup and view all the answers

What is the main purpose of the ATP generated during the light-dependent reactions of photosynthesis?

<p>To drive biochemical transformations in the light-independent phase (A)</p> Signup and view all the answers

During photosynthesis, where does the process of photophosphorylation occur?

<p>In the thylakoid membranes (D)</p> Signup and view all the answers

What is the primary function of chloroplast DNA in the process of photosynthesis?

<p>To encode essential genes involved in photosynthesis (D)</p> Signup and view all the answers

In photosynthesis, what is the purpose of the chlorophyll pigments within the thylakoid membranes?

<p>To absorb sunlight (C)</p> Signup and view all the answers

What is the primary source of energy for the synthesis of carbohydrates during photosynthesis?

<p>ATP and NADPH from the light-dependent reactions (B)</p> Signup and view all the answers

Which phase of photosynthesis occurs in the grana of chloroplasts?

<p>Light-dependent phase (C)</p> Signup and view all the answers

What is the primary function of excess glucose in photosynthesis?

<p>Storing energy (D)</p> Signup and view all the answers

Which compounds serve as the primary receptors of solar radiation in photosynthesis?

<p>Chlorophyll pigments (B)</p> Signup and view all the answers

What is the crucial role of the light-independent phase in photosynthesis?

<p>Assimilating carbon dioxide (D)</p> Signup and view all the answers

Which aspect of photosynthesis helps in the regulation of atmospheric carbon dioxide levels?

<p>Carbon assimilation (A)</p> Signup and view all the answers

What is the primary role of organic compound synthesis in photosynthesis?

<p>Synthesizing amino acids (C)</p> Signup and view all the answers

In photosynthesis, what serves as the primary fuel for metabolic processes in plants?

<p>Glucose (C)</p> Signup and view all the answers

What is the primary role of carbohydrate synthesis in photosynthesis?

<p>Storing energy (D)</p> Signup and view all the answers

How does photosynthesis contribute to atmospheric oxygen levels?

<p>Replenishing the O2 pool (A)</p> Signup and view all the answers

Which molecules undergo a transformative journey to produce carbohydrates in photosynthesis?

<p>Carbon dioxide and hydrogen ions (B)</p> Signup and view all the answers

Which organ in the digestive system produces a fluid that neutralizes stomach acid and emulsifies fats?

<p>Liver (C)</p> Signup and view all the answers

What is the primary function of villi in the small intestine in the digestive process?

<p>Increase surface area for absorption (D)</p> Signup and view all the answers

Which type of digestion is primarily responsible for breaking down food into smaller particles through chewing and peristalsis?

<p>Mechanical Digestion (A)</p> Signup and view all the answers

What is the primary function of the rectum in the digestive process?

<p>Storage of undigested waste (D)</p> Signup and view all the answers

Which process is responsible for controlling blood glucose levels within the body?

<p>Insulin production (C)</p> Signup and view all the answers

Where does the absorption of nutrients primarily occur before they are transported to cells for assimilation?

<p>Small Intestine (B)</p> Signup and view all the answers

What impact does excessive light intensity have on photosynthetic efficiency?

<p>Leads to photoinhibition and damage to photosynthetic apparatus (C)</p> Signup and view all the answers

How does low CO2 concentration affect photosynthetic activity?

<p>Constrains carbon availability (A)</p> Signup and view all the answers

What happens at temperatures beyond the optimal point for photosynthesis?

<p>Photoinhibition and protein structure disruption (A)</p> Signup and view all the answers

How are greenhouse environments beneficial for photosynthesis?

<p>Optimizing photosynthetic conditions (A)</p> Signup and view all the answers

What factor primarily influences the rate of photosynthesis by serving as a substrate for carbon fixation during the Calvin cycle?

<p>Carbon dioxide concentration (C)</p> Signup and view all the answers

At what light intensity does the rate of photosynthesis tend to be limited by the availability of radiant energy?

<p>Low light intensities (C)</p> Signup and view all the answers

What effect does CO2 concentration exceeding the optimum level have on photosynthetic efficiency?

<p>Leads to stomatal closure and reduced efficiency (D)</p> Signup and view all the answers

How does lower temperature impact enzymatic reactions in photosynthesis?

<p>Slows down enzymatic reactions (B)</p> Signup and view all the answers

What environmental factor modulates enzyme kinetics, membrane fluidity, and metabolic processes in photosynthesis?

<p>Temperature (D)</p> Signup and view all the answers

What impact does low CO2 concentration have on photosynthetic activity?

<p>Limits carbon availability (C)</p> Signup and view all the answers

What is the significance of examining the dentition of skulls in animals?

<p>Inferring an animal's dietary habits (D)</p> Signup and view all the answers

Why is the presence of carnassial teeth indicative of a carnivorous diet in animals?

<p>For cutting meat (C)</p> Signup and view all the answers

How does the dental formula for humans differ from that of carnivores?

<p>The presence of canines (C)</p> Signup and view all the answers

What is the primary difference between the dental formula of herbivores and carnivores?

<p>The development of canines (A)</p> Signup and view all the answers

Why is the human dental formula characterized by both incisors and molars?

<p>For omnivorous dietary habits (B)</p> Signup and view all the answers

What distinguishes the function of premolars from that of molars in animals?

<p>Cutting and crushing food (A)</p> Signup and view all the answers

What is the primary role of canines in animal dentition?

<p>Tearing prey (C)</p> Signup and view all the answers

Why are molars described as flat and uneven in the types of teeth found in animals?

<p>For grinding and crushing food (C)</p> Signup and view all the answers

In what way do the teeth of herbivores differ from those of carnivores?

<p>The size of canines (B)</p> Signup and view all the answers

What dietary habits do the presence of broad, flat molars typically indicate in animals?

<p>Plant-based diet (A)</p> Signup and view all the answers

Which investigative approach specifically aims to demonstrate the necessity of light for photosynthesis?

<p>Investigation 2: Light Requirement for Photosynthesis (A)</p> Signup and view all the answers

What is the purpose of destarching a plant before investigations related to photosynthesis?

<p>To ensure accurate results in subsequent investigations (B)</p> Signup and view all the answers

Which investigation highlights the significance of chlorophyll in photosynthesis through the use of variegated leaves?

<p>Investigation 4: Chlorophyll Requirement for Photosynthesis (B)</p> Signup and view all the answers

What is the main outcome of exposing a leaf to boiling water followed by ethanol treatment in the starch test investigation?

<p>Decolorization of the leaf (C)</p> Signup and view all the answers

What can be inferred from the outcome of the investigation related to carbon dioxide requirement for photosynthesis using sodium hydroxide and sodium bicarbonate solutions?

<p>CO2-releasing solutions are vital for carbon fixation (B)</p> Signup and view all the answers

What key function does the glowing splint test serve in investigations into photosynthesis?

<p>Demonstrating oxygen liberation during photosynthesis (A)</p> Signup and view all the answers

What is the primary purpose of applying iodine solution in the investigation regarding the starch test?

<p>To reveal the occurrence of starch in the leaf (C)</p> Signup and view all the answers

What practical purpose does the necessity of CO2 for photosynthetic carbon fixation serve in plant growth?

<p>Aiding in the synthesis of carbohydrates (D)</p> Signup and view all the answers

Which investigation conclusively indicates the absolute requirement of carbon dioxide for photosynthetic processes?

<p>Investigation 3: Carbon Dioxide Requirement for Photosynthesis (C)</p> Signup and view all the answers

What biological function of chlorophyll is highlighted by the outcome of the investigation using variegated leaves?

<p>Serving as the primary photosynthetic pigment (D)</p> Signup and view all the answers

What is the primary function of the Calvin cycle in photosynthesis?

<p>Producing glucose (D)</p> Signup and view all the answers

In photosynthesis, what initiates the photosynthetic process by exciting electrons within chlorophyll molecules?

<p>Absorption of radiant energy (A)</p> Signup and view all the answers

During photosynthesis, where does the absorption of light energy primarily occur?

<p>Thylakoid membrane (B)</p> Signup and view all the answers

What happens to protons during the light-dependent reactions of photosynthesis?

<p>They are pumped into the thylakoid space (B)</p> Signup and view all the answers

Which part of plant cells is primarily responsible for sustaining life on Earth by producing oxygen through the process of photosynthesis?

<p>Chloroplasts (D)</p> Signup and view all the answers

What drives plant growth and ecosystem productivity as a result of understanding the intricacies of photosynthesis?

<p>Providing chemical energy (B)</p> Signup and view all the answers

Which organ primarily regulates the entry and exit of food using sphincters?

<p>Stomach (D)</p> Signup and view all the answers

What is the main function of the gallbladder in the digestive process?

<p>Storing bile (A)</p> Signup and view all the answers

Which digestive organ plays a key role in controlling blood glucose levels?

<p>Liver (A)</p> Signup and view all the answers

What is the primary location for nutrient absorption in the human digestive system?

<p>Duodenum (B)</p> Signup and view all the answers

Which specific area in the small intestine has structures known as villi that increase the surface area for nutrient absorption?

<p>Jejunum (C)</p> Signup and view all the answers

What does the large intestine primarily absorb before feces are expelled through the anus?

<p>Mineral salts (C)</p> Signup and view all the answers

What is the primary biochemical phenomenon that unfolds within the chloroplasts of plant cells?

<p>Photosynthesis (D)</p> Signup and view all the answers

Which organelle encodes essential genes involved in photosynthesis and chloroplast function?

<p>Chloroplast DNA (D)</p> Signup and view all the answers

What is the primary function of the double membrane surrounding the chloroplast?

<p>Regulates substance passage (C)</p> Signup and view all the answers

Where do starch granules primarily store glucose molecules for plants?

<p>Stroma (A)</p> Signup and view all the answers

What serves as the primary receptor of sunlight within the chloroplast?

<p>Chlorophyll pigments (C)</p> Signup and view all the answers

Which phase of photosynthesis is characterized by the assimilation of carbon dioxide and the synthesis of carbohydrates?

<p>Calvin cycle (A)</p> Signup and view all the answers

What serves as a molecular reservoir of energy to power biochemical transformations in photosynthesis?

<p>Adenosine triphosphate (ATP) (C)</p> Signup and view all the answers

Which molecular process liberates oxygen and energy-rich hydrogen ions in the light-dependent phase of photosynthesis?

<p>Photolysis (C)</p> Signup and view all the answers

What source provides plants with a readily available energy source during low light intensity or photosynthetic activity?

<p>Starch granules (C)</p> Signup and view all the answers

Which part of the chloroplast is responsible for converting radiant energy from the sun into chemical energy?

<p>Thylakoid membrane (B)</p> Signup and view all the answers

What is the primary substrate for carbon fixation during the Calvin cycle?

<p>Carbon Dioxide (CO2) (A)</p> Signup and view all the answers

What effect does excessive light intensity have on photosynthetic efficiency?

<p>Leads to photoinhibition and damage (D)</p> Signup and view all the answers

What happens at low CO2 concentrations in terms of photosynthetic activity?

<p>Reduces carbon assimilation (B)</p> Signup and view all the answers

What is the impact of excessive temperatures on photosynthetic function?

<p>Induces enzyme denaturation (A)</p> Signup and view all the answers

How do CO2 concentrations above the optimum level affect photosynthetic efficiency?

<p>Cause stomatal closure and reduced efficiency (A)</p> Signup and view all the answers

What factor primarily influences the efficiency of light-dependent reactions in photosynthesis?

<p>Intensity of light (D)</p> Signup and view all the answers

In photosynthesis, what occurs when temperatures exceed the optimal range?

<p>Causes enzyme denaturation (A)</p> Signup and view all the answers

How do increases in light intensity beyond the optimal point affect photosynthetic rates?

<p>Result in reduced photosynthetic rates (C)</p> Signup and view all the answers

At which point do further increases in CO2 concentration yield diminishing returns in photosynthetic rates?

<p>Above the optimal level (D)</p> Signup and view all the answers

What is the effect of low light intensities on the rate of photosynthesis?

<p>Subdued photosynthetic activity (D)</p> Signup and view all the answers

What is the primary role of NADPH in photosynthesis?

<p>Electron carrier (A)</p> Signup and view all the answers

Where does the synthesis of ATP primarily occur within the chloroplast?

<p>Thylakoid lumen (D)</p> Signup and view all the answers

What is the primary function of lamellae in a chloroplast?

<p>Structural support (A)</p> Signup and view all the answers

Which organelle is responsible for conducting photosynthesis?

<p>Chloroplast (A)</p> Signup and view all the answers

What process facilitates the release of oxygen gas in photosynthesis?

<p>Photolysis of water (B)</p> Signup and view all the answers

Which pigment is responsible for capturing light energy in photosynthesis?

<p>Chlorophyll (B)</p> Signup and view all the answers

What is the primary outcome of the reduction phase during photosynthesis?

<p>Glucose production (B)</p> Signup and view all the answers

Where do the light-independent reactions of photosynthesis occur?

<p>Stroma (A)</p> Signup and view all the answers

What is the main role of grana in a chloroplast?

<p>Facilitating light absorption (A)</p> Signup and view all the answers

What is the primary role of RuBisCO in photosynthesis?

<p>Carbon fixation (C)</p> Signup and view all the answers

What is the purpose of destarching a plant before investigating photosynthesis?

<p>To ensure the accuracy of results in testing photosynthesis (C)</p> Signup and view all the answers

Why is the glowing splint test considered a significant investigative tool in photosynthesis experiments?

<p>To establish the necessity of oxygen in photosynthetic processes (B)</p> Signup and view all the answers

What is the conclusive evidence of oxygen liberation during photosynthesis?

<p>The re-ignition or intensified burning of a wooden splint (A)</p> Signup and view all the answers

Why is chlorophyll important in photosynthesis?

<p>To capture light energy for the conversion into chemical energy (C)</p> Signup and view all the answers

What is the impact of covering a portion of a leaf with aluminum foil during the investigation on light requirements for photosynthesis?

<p>Blocks the light needed for photosynthesis in the covered area (C)</p> Signup and view all the answers

What role does the light play in the experiment on the light requirement for photosynthesis?

<p>Drives the photosynthetic processes involving starch accumulation (A)</p> Signup and view all the answers

How does the absence of starch accumulation in the presence of sodium hydroxide in Investigation 3 illustrate the role of carbon dioxide in photosynthesis?

<p>Absence of carbon dioxide due to sodium hydroxide prevents starch formation (A)</p> Signup and view all the answers

In Investigation 4, what does the presence of starch in only chlorophyll-containing regions demonstrate about photosynthesis?

<p>Highlights the key role of chlorophyll in photosynthesis (D)</p> Signup and view all the answers

Why is systematic environmental manipulation considered important in investigations related to photosynthesis?

<p>To mimic natural conditions and study the plant's responses (C)</p> Signup and view all the answers

What is the specific function of canines in animals, according to the text?

<p>Used for catching and tearing prey (B)</p> Signup and view all the answers

What is the primary function of starch granules within plant cells?

<p>Serving as a vital reservoir of energy for metabolic processes (D)</p> Signup and view all the answers

Which type of teeth usually have jagged triangular edges and are adapted for cutting meat?

<p>Carnassial teeth (A)</p> Signup and view all the answers

What is the significance of the human dental formula 2.1.2.3?

<p>Represents the number of teeth in one half of the upper and lower jaws (C)</p> Signup and view all the answers

What unique attribute distinguishes the light-independent phase of photosynthesis from the light-dependent phase?

<p>Assimilates carbon dioxide to synthesize carbohydrates (C)</p> Signup and view all the answers

Which ecosystem service is NOT directly linked to photosynthesis?

<p>Mitigation of soil erosion (D)</p> Signup and view all the answers

How do herbivore skulls differ from carnivore skulls based on their dentition?

<p>Herbivore skulls lack canines while carnivore skulls possess sharp canines (D)</p> Signup and view all the answers

What is the primary role of oxygen released during photosynthesis?

<p>Supporting the respiratory needs of aerobic organisms (B)</p> Signup and view all the answers

What is the primary role of premolars in animals' dentition?

<p>Used for grinding and crushing food (A)</p> Signup and view all the answers

In what way do herbivores' teeth typically differ from carnivores' teeth, reflecting their dietary habits?

<p>Herbivores possess incisors for cutting plant material and molars for grinding (A)</p> Signup and view all the answers

Which statement best describes the conversion of radiant energy in photosynthesis?

<p>Sunlight energy is converted into chemical energy in the form of glucose (A)</p> Signup and view all the answers

What major function besides glucose production does photosynthesis serve?

<p>Synthesizing organic compounds essential for cellular structure (A)</p> Signup and view all the answers

What role do carnassial teeth play in the dentition of carnivores such as cats and dogs?

<p>Shearing meat effectively (A)</p> Signup and view all the answers

How does the dental structure of animals reflect their dietary preferences?

<p>Specific tooth types are tailored for different feeding behaviors (C)</p> Signup and view all the answers

Which factor would most likely have a significant impact if photosynthesis did not occur?

<p>Decrease in oxygen levels in the atmosphere (D)</p> Signup and view all the answers

What role does the stroma of chloroplasts play in photosynthesis?

<p>Assimilating carbon dioxide to synthesize carbohydrates (B)</p> Signup and view all the answers

What characteristic distinguishes canines from other types of teeth in animals?

<p>Triangular edges (B)</p> Signup and view all the answers

Why do omnivores possess a combination of herbivore and carnivore dentition?

<p>To support the digestion of varied food sources (B)</p> Signup and view all the answers

What is the ultimate significance of photosynthesis in sustaining life on Earth?

<p>Supplying organic compounds as food across trophic levels (A)</p> Signup and view all the answers

Which primary process would be compromised if photosynthesis ceased to occur in plants?

<p>Energy production through cellular respiration (B)</p> Signup and view all the answers

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