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Questions and Answers
What is the role of chlorophyll during the day in desert plants?
What is the role of chlorophyll during the day in desert plants?
- To absorb carbon dioxide at night
- To prepare an intermediate for the night
- To release oxygen during the night
- To absorb energy that is used to act on an intermediate (correct)
What can be observed under a microscope in a leaf cross-section?
What can be observed under a microscope in a leaf cross-section?
- Only green dots
- Only chloroplasts
- Cell organelles called chloroplasts which contain chlorophyll (correct)
- Only starch grains
What is the purpose of Activity 6.1?
What is the purpose of Activity 6.1?
- To compare the growth of different plant species
- To show that chlorophyll is essential for photosynthesis (correct)
- To demonstrate the importance of sunlight for plant growth
- To observe the structure of a leaf cross-section
What is the role of the intermediate in desert plants?
What is the role of the intermediate in desert plants?
Why are variegated leaves used in Activity 6.1?
Why are variegated leaves used in Activity 6.1?
What happens to the starch in a plant when it is kept in a dark room for three days?
What happens to the starch in a plant when it is kept in a dark room for three days?
What is necessary to observe the effect of chlorophyll on photosynthesis?
What is necessary to observe the effect of chlorophyll on photosynthesis?
What is the purpose of marking the green areas in Activity 6.1?
What is the purpose of marking the green areas in Activity 6.1?
What is the primary reason for the development of a specialized tissue for excretion in multi-cellular organisms?
What is the primary reason for the development of a specialized tissue for excretion in multi-cellular organisms?
Which of the following is a characteristic of autotrophs?
Which of the following is a characteristic of autotrophs?
What is the primary function of enzymes in heterotrophic organisms?
What is the primary function of enzymes in heterotrophic organisms?
Why do multi-cellular organisms like humans require a transportation system?
Why do multi-cellular organisms like humans require a transportation system?
What is the primary source of energy and materials for living organisms?
What is the primary source of energy and materials for living organisms?
Which of the following is a characteristic of heterotrophic organisms?
Which of the following is a characteristic of heterotrophic organisms?
Why are autotrophs essential for the survival of heterotrophs?
Why are autotrophs essential for the survival of heterotrophs?
What is the primary function of the transportation system in multi-cellular organisms?
What is the primary function of the transportation system in multi-cellular organisms?
What is the primary function of carbohydrates in autotrophic organisms?
What is the primary function of carbohydrates in autotrophic organisms?
What is the role of chlorophyll in photosynthesis?
What is the role of chlorophyll in photosynthesis?
What is the fate of excess carbohydrates in autotrophic organisms?
What is the fate of excess carbohydrates in autotrophic organisms?
What is the byproduct of water molecule splitting during photosynthesis?
What is the byproduct of water molecule splitting during photosynthesis?
What is the energy source for autotrophic organisms?
What is the energy source for autotrophic organisms?
What is the similarity between autotrophic organisms and humans in terms of energy storage?
What is the similarity between autotrophic organisms and humans in terms of energy storage?
What is the sequence of events during photosynthesis?
What is the sequence of events during photosynthesis?
What is the primary role of photosynthesis in autotrophic organisms?
What is the primary role of photosynthesis in autotrophic organisms?
What is the purpose of using potassium hydroxide in the experiment?
What is the purpose of using potassium hydroxide in the experiment?
What is the main function of roots in terrestrial plants?
What is the main function of roots in terrestrial plants?
What is the essential element used in the synthesis of proteins and other compounds?
What is the essential element used in the synthesis of proteins and other compounds?
Why are the plants kept in a dark room for three days?
Why are the plants kept in a dark room for three days?
What is the purpose of using vaseline to seal the bottom of the jars?
What is the purpose of using vaseline to seal the bottom of the jars?
What is the conclusion that can be drawn from the experiment?
What is the conclusion that can be drawn from the experiment?
What is the role of autotrophs in the ecosystem?
What is the role of autotrophs in the ecosystem?
What is the significance of checking for the presence of starch in the leaves?
What is the significance of checking for the presence of starch in the leaves?
What is the primary purpose of heating the beaker containing alcohol in the starch test?
What is the primary purpose of heating the beaker containing alcohol in the starch test?
What is the role of the guard cells in the stomatal pore?
What is the role of the guard cells in the stomatal pore?
What is the significance of the starch test in understanding plant physiology?
What is the significance of the starch test in understanding plant physiology?
What is the purpose of dipping the leaf in a dilute solution of iodine in the starch test?
What is the purpose of dipping the leaf in a dilute solution of iodine in the starch test?
What is the significance of the stomatal pore in plant physiology?
What is the significance of the stomatal pore in plant physiology?
What is the result of the guard cells shrinking in the stomatal pore?
What is the result of the guard cells shrinking in the stomatal pore?
What is the purpose of observing the colour of the leaf before and after the starch test?
What is the purpose of observing the colour of the leaf before and after the starch test?
What is the significance of the variegated leaf in the starch test?
What is the significance of the variegated leaf in the starch test?
Study Notes
Nutrition in Multi-Cellular Organisms
- In multi-cellular organisms, specialized tissues are developed for excretion, requiring a transportation system to transport waste away from cells to the excretory tissue.
- Energy and materials from outside are necessary for growth, development, synthesizing protein, and other substances needed in the body.
Autotrophic Nutrition
- Autotrophs, such as green plants and some bacteria, use simple food materials obtained from inorganic sources, like carbon dioxide and water, to fulfill their energy and material requirements.
- Photosynthesis is the process by which autotrophs convert substances from the outside into stored forms of energy.
- Carbon dioxide and water are converted into carbohydrates in the presence of sunlight and chlorophyll, which provide energy to the plant.
Process of Photosynthesis
- Light energy is absorbed by chlorophyll.
- Light energy is converted into chemical energy, and water molecules are split into hydrogen and oxygen.
- Carbon dioxide is reduced to carbohydrates.
- These steps can occur separately, and the plant may prepare an intermediate product at night, which is acted upon by the energy absorbed during the day.
Role of Chlorophyll
- Chlorophyll is essential for photosynthesis.
- Chloroplasts, which contain chlorophyll, are cell organelles found in green dots in leaf cells.
Importance of Stomata
- Stomata are tiny pores present on the surface of leaves, allowing for massive gaseous exchange during photosynthesis.
- Stomata are also present on stems, roots, and leaves.
- Guard cells control the opening and closing of stomata, and they swell when water flows into them, causing the stomatal pore to open.
Experiment to Demonstrate Photosynthesis
- Activity 6.1 demonstrates the importance of chlorophyll in photosynthesis.
- Activity 6.2 shows the effect of carbon dioxide on photosynthesis.
- These activities can be used to design an experiment to demonstrate the importance of sunlight for photosynthesis.
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Description
Learn about the nutrition process in multi-cellular organisms and autotrophic nutrition in green plants and some bacteria. Understand how they obtain energy and materials.
