Podcast
Questions and Answers
Which of the following statements about autotrophs is incorrect?
Which of the following statements about autotrophs is incorrect?
Heterotrophs are capable of synthesizing their own food.
Heterotrophs are capable of synthesizing their own food.
False
What substance protects the inner lining of the stomach from hydrochloric acid?
What substance protects the inner lining of the stomach from hydrochloric acid?
Mucus
The first part of the human alimentary canal is the ______.
The first part of the human alimentary canal is the ______.
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In which group of organisms is food material broken down outside the body and absorbed?
In which group of organisms is food material broken down outside the body and absorbed?
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Match the following components of the human digestive system with their functions:
Match the following components of the human digestive system with their functions:
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If salivary amylase is lacking in the saliva, starch will continue to break down into sugars.
If salivary amylase is lacking in the saliva, starch will continue to break down into sugars.
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Which part of the alimentary canal receives bile from the liver?
Which part of the alimentary canal receives bile from the liver?
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What indicates that rice water contains starch?
What indicates that rice water contains starch?
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In which part of the alimentary canal is food finally digested?
In which part of the alimentary canal is food finally digested?
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Trypsin digests fats and lipase digests carbohydrates.
Trypsin digests fats and lipase digests carbohydrates.
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What happens to lime water when carbon dioxide is blown into it?
What happens to lime water when carbon dioxide is blown into it?
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The correct equation for anaerobic respiration in yeast is glucose converts to ______ and ______.
The correct equation for anaerobic respiration in yeast is glucose converts to ______ and ______.
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Which of the following is the correct sequence for aerobic respiration?
Which of the following is the correct sequence for aerobic respiration?
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Match the process of respiration with its products:
Match the process of respiration with its products:
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Aerobic respiration occurs without the presence of oxygen.
Aerobic respiration occurs without the presence of oxygen.
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Which of the following aquatic animals exhibit single circulation?
Which of the following aquatic animals exhibit single circulation?
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In which group does the heart not pump oxygenated blood to different parts of the body?
In which group does the heart not pump oxygenated blood to different parts of the body?
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Arteries have thin walls with valves inside.
Arteries have thin walls with valves inside.
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What are the filtration units of kidneys called?
What are the filtration units of kidneys called?
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Oxygen liberated during photosynthesis comes from which source?
Oxygen liberated during photosynthesis comes from which source?
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The blood leaving the tissues becomes richer in ______.
The blood leaving the tissues becomes richer in ______.
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Organisms must repair and maintain their structure.
Organisms must repair and maintain their structure.
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Match the internal energy reserves in autotrophs with their types:
Match the internal energy reserves in autotrophs with their types:
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Which of the following statements about gas exchange in the alveoli is true?
Which of the following statements about gas exchange in the alveoli is true?
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Haemoglobin has a greater affinity for oxygen than carbon dioxide.
Haemoglobin has a greater affinity for oxygen than carbon dioxide.
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What structure in the lungs increases the surface area for gas exchange?
What structure in the lungs increases the surface area for gas exchange?
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During inhalation, air passes through the ______ before reaching the lungs.
During inhalation, air passes through the ______ before reaching the lungs.
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Which is the correct sequence of air passage during inhalation?
Which is the correct sequence of air passage during inhalation?
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Match the parts of the heart with their functions:
Match the parts of the heart with their functions:
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The valves in the heart prevent backflow of blood during contraction.
The valves in the heart prevent backflow of blood during contraction.
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During respiration, gases are exchanged primarily in which part of the respiratory system?
During respiration, gases are exchanged primarily in which part of the respiratory system?
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Which equation best summarizes the process of photosynthesis?
Which equation best summarizes the process of photosynthesis?
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Reduction of carbon dioxide to carbohydrates occurs during photosynthesis.
Reduction of carbon dioxide to carbohydrates occurs during photosynthesis.
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What do guard cells regulate in relation to stomatal pores?
What do guard cells regulate in relation to stomatal pores?
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Most plants absorb nitrogen primarily in the form of __________.
Most plants absorb nitrogen primarily in the form of __________.
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Which enzyme is the first to mix with food in the digestive tract?
Which enzyme is the first to mix with food in the digestive tract?
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Match the following fermentation statements with their correct descriptions:
Match the following fermentation statements with their correct descriptions:
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Lack of oxygen in muscles leads to the conversion of pyruvate into glucose, causing cramps.
Lack of oxygen in muscles leads to the conversion of pyruvate into glucose, causing cramps.
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Choose the correct path of urine flow in the body.
Choose the correct path of urine flow in the body.
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What is the primary function of bile in the digestive process?
What is the primary function of bile in the digestive process?
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The absence of mucus secreted by gastric glands can lead to damage of the stomach lining.
The absence of mucus secreted by gastric glands can lead to damage of the stomach lining.
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What causes the movement of food inside the alimentary canal?
What causes the movement of food inside the alimentary canal?
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The main process where plants convert sunlight into energy is called ______.
The main process where plants convert sunlight into energy is called ______.
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Match the types of nutrition with their corresponding examples:
Match the types of nutrition with their corresponding examples:
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Why is the rate of breathing in aquatic organisms generally faster than in terrestrial organisms?
Why is the rate of breathing in aquatic organisms generally faster than in terrestrial organisms?
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The energy currency of living organisms is glucose.
The energy currency of living organisms is glucose.
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What is the advantage of having a four-chambered heart?
What is the advantage of having a four-chambered heart?
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Study Notes
Life Processes - Multiple Choice Questions
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Autotrophs: Autotrophs synthesize carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll. They store carbohydrates as starch and constitute the first trophic level in food chains. They do not produce carbohydrates in the absence of sunlight.
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External Digestion: Some organisms break down food material outside the body before absorption. Examples include mushrooms, yeast, and bread mold.
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Heterotrophs: Heterotrophs cannot synthesize their own food and rely on other organisms for their energy needs.
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Alimentary Canal (Human): The correct sequence of parts in the human alimentary canal is mouth → oesophagus → stomach → small intestine → large intestine.
Life Processes - Multiple Choice Questions (Page 2)
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Salivary Amylase: Salivary amylase is responsible for breaking down starch into sugars in the mouth. Deficiency of this enzyme affects this process.
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Stomach Lining Protection: The inner lining of the stomach is protected from the acidic digestive juices by mucus.
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Bile and Small Intestine: Bile, produced by the liver, is delivered to the small intestine, where it aids in fat digestion.
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Rice Water and Iodine: Adding iodine solution to rice water results in a blue-black color, indicating the presence of starch.
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Final Digestion: The small intestine is the primary site for the final digestion of food.
Life Processes - Multiple Choice Questions (Page 3)
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Anaerobic Respiration (Yeast): The process of anaerobic respiration in yeast involves glucose converting to pyruvate in the cytoplasm, then pyruvate to ethanol and carbon dioxide.
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Aerobic Respiration: In aerobic respiration, glucose is converted to pyruvate in the cytoplasm, and the resulting pyruvate is further oxidized in the mitochondria to carbon dioxide and water, releasing energy.
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Respiration and Inhalation/Exhalation: During inhalation, the ribs move outwards and the diaphragm moves downwards creating a vacuum for air to be drawn in. Oxygen diffuses from alveoli into blood and carbon dioxide from blood into alveoli. Alveoli increase surface area for gas exchange.
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Inhalation Pathway: The correct pathway for inhalation is nostrils → pharynx → larynx → trachea → alveoli.
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Gas Exchange: Gas exchange occurs in the alveoli of the lungs.
Life Processes - Multiple Choice Questions (Page 4)
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Heart Function: The left atrium receives oxygenated blood from the body, and the right atrium receives deoxygenated blood from the lungs. The left ventricle pumps oxygenated blood to the body and the right ventricle pumps deoxygenated blood to the lungs.
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Heart Valves: Heart valves prevent the backflow of blood inside the heart during contraction, ensuring unidirectional blood flow.
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Single Circulation: In single-circulation, blood passes through the heart only once during a circuit of the body. Single circulation is seen in fishes. Amphibians, reptiles and birds exhibit double circulation.
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Oxygenated Blood Pumping: Not all vertebrate groups, like amphibians, pump oxygenated blood to all parts of the body. Example is a fish.
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Arteries: Arteries have thick elastic walls, carry blood away from the heart at high pressure, but do not contain valves.
Life Processes - Multiple Choice Questions (Page 5)
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Kidney Filtration Units: The filtration units of kidneys are called nephrons.
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Oxygen Source in Photosynthesis: Oxygen released during photosynthesis is derived from water molecules.
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Blood and Tissues: Blood leaving the tissues is richer in carbon dioxide compared to oxygen.
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Energy and Life Processes: Energy is essential for life processes and maintaining cellular structures and functions. Organisms grow, repair, and maintain their structures.
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Photosynthesis Equation: The summary equation for photosynthesis is 6CO₂ + 12H₂O + Light Energy → C₆H₁₂O₆ + 6O₂ + 6H₂O.
Life Processes - Multiple Choice Questions (Page 6)
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Stomatal Pore Opening/Closing: Stomatal pore opening and closing depend on water concentration in guard cells.
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Nitrogen Absorption: Plants absorb nitrogen mainly in the form of nitrates and nitrites from the atmosphere.
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First Digestive Enzyme: The first enzyme to mix with food in the digestive tract is amylase.
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Fermentation: Fermentation is a form of anaerobic respiration, occurring in yeast and some bacteria, where pyruvate is converted to ethanol and carbon dioxide, or lactic acid.
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Cramps: Cramps in muscles, like those in cricketers due to oxygen deficiency, result from the conversion of pyruvate to lactic acid.
Life Processes - Multiple Choice Questions (Page 7)
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Photosynthesis: Photosynthesis is the process by which plants convert light energy into chemical energy, a fundamental process for life on Earth.
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Oxygen and Carbon Dioxide Exchange in Plants: Plants take in carbon dioxide and release oxygen during the day in the presence of light, using photosynthesis. They release carbon dioxide and absorb oxygen during the night.
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Plant Survival: Plants in dark containers will survive less time and those in continuous light will survive longer.
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Oxygen and Carbon Dioxide Exchange in Plants: Photosynthesis is a process where plants take in carbon dioxide and produce oxygen in the presence of light but not always. It is not always the case that oxygen is taken up if plants are releasing carbon dioxide—they can be performing both processes simultaneously.
Life Processes - Multiple Choice Questions (Page 8 & 9)
- Blood Vessels (Arteries and Veins): Arteries carry oxygenated blood away from the heart at high pressure, while veins carry deoxygenated blood back to the heart at low pressure.
- Digestion: Several digestive organs play a significant role in a mammal's alimentary canal.
- Photosynthesis: Photosynthesis involves absorption of light energy by chlorophyll, conversion to chemical energy, and the reduction of carbon dioxide to carbohydrates.
- Respiration/Energy Conversion: Aerobic respiration generates more energy per glucose molecule compared to anaerobic respiration and produces far more ATP (adenosine triphosphate).
- Organ Functions: Specific organs, like the small intestine, kidneys, etc. play important roles in the digestive, excretory, and other bodily processes.
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Description
Test your knowledge on autotrophs, the human digestive system, and various biological processes with this quiz. Explore key concepts such as digestion, respiration, and the functions of different organ systems. Get ready to challenge yourself and deepen your understanding of biology!
