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प्रश्न
Given below is the figure of an experimental set-up, showing a physiological act of the plants. Study and answer the following questions:
- What is the objective of this experiment?
- Name and define the process shown here.
- Why do we destarch the leaves before performing the experiment?
- How do we destarch the leaves?
- What will be the observation when we pour iodine solution over the bleached experimental leaf?
- Write a well-balanced equation for the above process.
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उत्तर
- To demonstrate the need for sunlight for photosynthesis.
- Photosynthesis. Photosynthesis is the process by which plants produce glucose using water, carbon dioxide, sunshine, and chlorophyll pigment in their leaves. Photosynthesis produces glucose and oxygen as its end products. Plants use glucose to power their cells, while other species require oxygen for respiration.
- We remove starch from a plant to facilitate photosynthesis in the presence of sunlight. If starch is already present in the leaves, photosynthesis does not take place.
- By keeping the leaves in a dark room for 24 to 48 hours, we can destarch them. This is because darkness inhibits photosynthesis and enables the plant to use up any stored starch.
- If starch is present, the bleached experimental leaf will turn blue-black when iodine solution is applied. The leaf is said to be starch-free if there is no colour change and it stays brown.
- \[\ce{6CO2 + 6H2O ->[Sunlight][Chlorophyll] C6H12O6 + 6O2}\]
संबंधित प्रश्न
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 is Cuticle.
Given below is the representation of a certain phenomenon in nature. With four organisms 1-4.
Name one natural element which all the organisms 2-4 and even 5 are getting from No. 1 for their survival.
Given alongside is the diagram of an experimental set-up:
- What is the objective of this experiment?
- Will it work satisfactorily? Give reason.
- What alteration(s) will you make in it for obtaining expected result?
- Would you take any steps before starting the experiment? Describe this step and explain its necessity.
A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
Write a balanced chemical equation to represent the process of photosynthesis.
Differentiate Between:
Light reaction and Dark reaction.
Name the following:
The green colouring matter of the plants.
Give technical term:
Name only one plant, you are familiar with which has no chlorophyll.
Complete the following sentence with appropriate word:
A light-induced reaction which leads to the splitting of water is _____ of water.
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 |
