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प्रश्न
Two healthy green plants were placed in the dark for 24 hours. They were then set up, as shown in the figure, for 4 hours. Then a leaf was taken from each plant and
the chlorophyll was removed from the leaves:
( i) What is the next and final step in this experiment?
( ii ) What would be the results of the final step?
( iii ) Why was it necessary to grease the glass sheet?
( iv ) What hypothesis is being tested in this experiment?
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उत्तर
(i) The leaf is then treated with iodine solution.
(ii) The leaf from first plant will not show starch test while the leaf from second plant will become blue-black showing the presence of starch.
(iii) It is necessary to grease the glass sheet to prevent the entry of air containing CO2.
(iv) The hypothesis that CO2 is necessary for photosynthesis is being tested in this experiment.
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संबंधित प्रश्न
The diagram is set up to demonstrate an experiment. Pond weed was placed in five water-filled tubes. The experiment was set up as shown in the diagram. The tubes were then left for 24 hours. Write the correct answer out of the five available choices:
(i) In which tube would you except to find the plant with the least amount of starch?
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5
(ii) The tube in which most oxygen would be found is
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5
(iii) The tube in which least carbon dioxide would be found is
(a ) 1 (b) 2 (c) 3 (d) 4 (e ) 5
(iv) The tube in which the plant would survive for the shortest length of time is
(a ) 1 (b) 2 (c) 3 (d) 4 (e) 5
Name the following:
The source of carbon dioxide for aquatic plants.
Why is it not possible to demonstrate respiration in a green plant kept in sunlight?
Photosynthesis in green plants is directly and indirectly dependent on so many plant structures.
Explain briefly the role of the following structures in this process Guard cells.
Given below is a schematic diagram to illustrate some aspects of photosynthesis.
- Fill up the gaps, in blank spaces (1-4), by writing the names of the correct items.
- What phenomenon do the thick arrows A and B indicate?
Given alongside is the diagram of an experimental set-up:
What alteration (s) will you make in it for obtaining expected result?
Where are the chlorophyll pigments present in a cell?
Give technical term:
Name only one plant, you are familiar with which has no chlorophyll.
Name two plants having variegated leaves.
Match the terms given in column A with column B:
| Column A | Column B | ||
| (a) | Chlorophyll | (i) | Removes/absorbs CO2 |
| (b) | Methylated spirit | (ii) | Tests presence of starch |
| (c) | Potassium hydroxide | (iii) | Traps solar energy |
| (d) | Iodine solution | (iv) | Produces oxygen |
| (e) | Water | (v) | Bleaches chlorophyll |
