ICSE 2009 Solved Important Papers of Biology By Mr. M. P. Keshari

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Biology - Photosynthesis (Solved)

Question .1. Name the following :

(i) The structure where photosynthesis takes place.

(ii) The part of the chloroplast where the dark reaction of photosynthesis takes place.

(iii) Plants that prepare their own food from basic raw materials.

(iv) The energy currency of the cell.

(v) The process by which green plants prepare their own food.

(vi) The product of photosynthesis.

(vii) A plant that does not perform photosynthesis.

(viii) A gas released by green plants during photosynthesis.

(ix) The raw materials needed for photosynthesis.

(x) The site of light reaction.

(xi) The substance from which oxygen is evolved during photosynthesis.

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Question .2. State true or false :

(i) Photosynthesis occurs in all the cells of a plant.

(ii) Stomata is stimulated by light.

(iii) Grana helps in diffusion of gases.

(iv) Photosynthesis results in the loss of dry weight of the plant.

(v) The unit of light absorbed by the chlorophyll during photosynthesis is the proton.

(vi) Photosynthesis stops to occur at a temperature above 35 ºC.

(vii) Plants can be destarched by keeping in dark for 48 hours.

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Question .3. Choose the correct alternative :

(i) A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to (remove chlorophyll from leaves, remove starch from the plant , ensure that no photosynthesis occurs, ensure that leaves are free from starch).

(ii) The site of light reaction in the cells of a leaf is (grana, cytoplasm, stroma).

(iii) The chemical substance used to test the presence of starch in the cell of a leaf is (cobalt chloride paper, iodine solution, Benedict’s solution).  

(iv) The specific function of light energy in the process of photosynthesis is to (reduce carbon dioxide, synthesise glucose, activate chlorophyll, split water).

(v) If the rate of respiration becomes more than the rate of photosynthesis plants will (continue to live but will not be able to store food, be killed instantly, grow more vigorously because more energy will be available, stop growing and gradually die of starvation).

(vi) Which one of these reaction occurs during photosynthesis ? (carbon dioxide is reduced and water is oxidized, water is reduced and carbon dioxide is oxidized, carbon dioxide and water both are oxidized, carbon dioxide and water both are reduced).

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Question .4. Give exact location and function of :

(i) Stoma,

(ii) Thylakoids,

(iii) Guard cell,

(iii) Grana.

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Question .5. (i) Explain the following terms : Photolysis.

(ii) What is meant by photolysis of water ?

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Question .6. Answer the following :

(i) Name the two phases of photosynthesis.

(ii) What is the role of light in this process ?

(iii) Describe any three adaptation in a green leaf for photosynthesis.

(iv) Describe an experiment to show that light is necessary for photosynthesis.

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Question .7. Define :

(i) Photophosphorylation.

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Question .8. Re-write the correct form of statement by inserting a suitable word/words at right place. Do not delete any word in the statement :

(i) Destarching a plant means removing the starch from the plant.

(ii) The splitting of water molecules into hydrogen and hydroxyl ions is termed photolysis.

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Question .9. Re-write the terms in correct order in a logical sequence :

(i) Water molecules, oxygen, grana, hydrogen and hydroxyl ions, photons.

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Question .10. Complete the following process to show how the oxygen in the air reaches a mesophyl cell of the leaf.

Oxygen in air → −− → −− → Mesophyl cell.

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Question .11. Fill in the blanks : Chloroplasts and _______.

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Question .12. Distinguish between the following :

(i) Light reaction and Dark reaction.

(ii) Autotrophs and Heterotrophs.

(iii) Stroma and Grana.

(iv) Photosynthesis and Respiration.

(v) Chloroplast and chlorophyll.

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Question .13. Enumerate the steps involved in testing a green leaf for the presence of starch.

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Question .14. Write the full form of NADP and ATP.

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Question .15. A healthy Croton plant bearing variegated leaves was kept in a dark cupboard to destarch it, after which it was placed in sunlight for few hours. One of the leaves was then plucked and an outline of the leaf marking the green and non-green regions was drawn. The leaf was then tested for starch. Using the above information, answer the following questions:

(i) State the aim of the above experiment.

(ii) Name the chemical used for testing the presence of starch.

(iii) Why is the leaf boiled in water and alcohol before testing for the presence of starch ?

(iv) What change is seen on the leaf after the starch test ?

(v) Give the chemical equation to represent the process of syarch formation in plants.

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Question .16. A candidate in order to study the importance of certain factors in photosynthesis, took a potted plant and kept in the dark for over 24 hours. Then in the early hours of the morning she covered one of the leaves with black paper in the centre only. She placed the potted plant in the sunlight for a few hours and then tested the leaf which was covered with black paper for starch.

(i) What aspect of photosynthesis was being investigated ?

(ii) Is there any control in this experiment ? If so state the same.

(iii) Why was the plant kept in the dark before the experiment ?

(iv) Describe step by step how the candidate proceeded to test the leaf for the presence of starch ?

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Question .17. Give biological reasons :

(i) A tiger owes its existence to chlorophyll.

(ii) Oxygen given out during photosynthesis comes from water.

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Question .18. (i) Fill in the blank in the following equations for two chemical reactions :

1. ______ + 12H₂O → C H O + ________ + ______.

2. _______ + 6O₂ → 6 ______ +   6 _______ + Energy.

(ii) Name the two process represented by the above two reactions.

(iii) Which one of these two reactions is the support of all life on earth.

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Q.19. Draw a neat labeled diagram of the experimental set up to show that green plants give out oxygen during photosynthesis.

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