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प्रश्न
Write an experiment to demonstrate that CO2 is necessary for photosynthesis.
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उत्तर
Take a destarched plant. Insert one of its leaves in a conical flask, which contains potassium hydroxide. Leave it in the sunlight. After a few hours, test this and any other leaf of this plant for starch. The leaf which was exposed to the atmospheric air becomes blue-black, and the one in the flask containing KOH does not become blue-black after the iodine test. The experiment showing that CO2 is necessary for photosynthesis.
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संबंधित प्रश्न
Formalin, Iodine, DDT, Lime
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions:
(i) Name the process intended for study.
(ii) Define the above mentioned process.
(iii) When the weight of the test tube (A & B) is taken before and after the experiment, what is observed? Give reasons to justify your observation in A & B.
(iv) What is the purpose of keeping the test tube B in the experimental setup?
What are the basic requirements of photosynthesis?
Give technical term:
The main reaction which means the breaking up of water molecules through light.
Complete the following sentence with appropriate word:
4OH ——> _____ + O2
During photosynthesis, ________ is produced and stored in the leaf.
What will happen if you breathe through mouth?
Name the plant part
- Which bends in the direction of gravity but away from the light.
- Which bends towards light but away from the force of gravity.
The source of O2 liberated in photosynthesis is ______.
1. What happens to the dandelion flower
- During the daytime?
- At night?
2. What is the phenomenon known as?
