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प्रश्न
The figure given below is for performing an experiment on photosynthesis.
Answer the following:
(i) What is the aim of this experiment?
(ii) Describe an experiment to show that light is necessary for photosynthesis.
(iii) What do you conclude from this experiment?
(iv) What is the role of light in photosynthesis?
उत्तर
- To demonstrate that sunlight is necessary for photosynthesis.
- Take a potted plant and keep it for 2-3 days in dark to destarch its leaves. Take one leaf and cover it on both sides with two black paper strips, as shown in the diagram, with the help of cellophane tape. Now keep the potted plant in light. After a few hours pluck the leaf and remove the black strips. Boil the leaf in alcohol and wash it in water. Test the leaf for starch with iodine solution. The leaf turns blue all over except the region covered with black stripes. This shows that the region which did not receive light could not synthesise starch. Thus, light is necessary for photosynthesis.
- Light is necessary for photosynthesis.
- Light supplies energy in the form of photons to split water during tight reaction.
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संबंधित प्रश्न
Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow : 
What is Thigmotropism? Give one example.
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow :
What will you observe in the experimental leaf after the starch test?
The following statement is about photosynthesis in a green plant. Write whether it is True or False.
Photosynthesis results in a gain in dry weight.
If the rate of respiration becomes more than the rate of photosynthesis, plants will:
Identify the false statements and rewrite them correctly by changing the first or last word only.
Immediate product of photosynthesis is glucose.
Are the following statement true or false? Give a reason in support of your answer.
If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesise in bright sunshine.
How is the rate of photosynthesis affected when a green plant gets the green light?
Complete the following sentence with appropriate word:
4OH ——> _____ + O2
Write the functional activity of the following structure:
Chloroplasts
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’.
| Column I | Column II | ||
| (i) | Grana | (a) | Decomposers |
| (ii) | Autotrophs | (b) | Light reaction |
| (iii) | By-products of photosynthesis | (c) | Animals |
| (iv) | Photolysis | (d) | Oxygen |
| (v) | Bacteria and fungi | (e) | Stimulated by light |
| (vi) | Chloroplast | (f) | Power |
| (vii) | Oxygen and water | (g) | Raw material |
| (viii) | Sunlight | (h) | Machinery |
| (ix) | CO2 and water | (i) | End products |
| (x) | Glucose (sugar) | (j) | Workrooms |
| (xi) | Cells in the leaf | (k) | By-products. |
Choose the correct option.
In presence of high concentration of oxygen, RuBP carboxylase converts RuBP to ______.
During photosynthesis, ________ is produced and stored in the leaf.
What will happen if we remove plants from the aquarium?
What will happen if we remove the fish from the aquarium and keep it (with green plants) in a dark place?
What will happen if you breathe through mouth?
State whether true or false. If false, correct the statement.
Plants lose water when the stomata on leaves are closed.
______ is ATP factory of the cells.
Where do the light-dependent reaction and the Calvin cycle occur in the chloroplast?
Which gas evolved during photosynthesis?
