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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
Define the following:
Plant pigments
Define the following:
Quantum
Choose the correct answer:
The process of photosynthesis occurs by _________
Which one chemical reaction occurs during photosynthesis?
The specific function of light energy in the process of photosynthesis is to
Mention one difference between the following on the basis of what is given in bracket.
Grass and grasshopper (mode of nutrition)
A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.
What aspect of photosynthesis was being investigated?
Explain, why respiration is said to be a reversed process of photosynthesis?
Give technical term:
Name the tissue that transports manufactured starch from the leaves to all parts of the plant.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Photosynthesis can also occur n artificial light such as that of a 100-watt electric lamp.
Write the functional activity of the following structure:
Stroma
Choose the correct option.
Energy is transferred from the light reaction step to the dark reaction step by ______.
Choose the correct option.
In maize and wheat, the first stable products formed in bundle sheath cells respectively are ________.
Answer the following question.
Explain why photosynthesis is considered the most important process in the biosphere.
______ is ATP factory of the cells.
During photosynthesis, plants exhale ______.
What are stomata?
Arrange and rewrite the terms in the group in the correct order to be in a logical sequence beginning with the term that is underlined:
Snake, Rabbit, Cabbage, Hawk.
