Sunlight is important for photosynthesis explain in an activity
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Hey Mate! I've written these points and activity from my reference book. So I hope this helps you too.
•Aim of the experiment:-
To prove Sunlight necessary for green plants to prepare their food.
•Requirements:-
A well watered potted green plant, two strips of black papers, small clips, spirit lamp or bun sen burner, test tube, beaker, Petr-dish, water, mentholated spirit or rectified spirit or ethanol, iodine solution.
•Procedure for the experiment
Before starting the experiment to prove Sunlight is necessary for photosynthesis an important step has to be carried out is known as De-starching. De-starching is a process in which the starch present in the leaves will be eliminated by keeping the plant in dark room or closed cup-board for about 48 hours. This step is done to ensure that previously manufactured food in the leaves get consumed when the plant was kept in dark place since photosynthesis doesn't occur at that time.
Next strips of black paper will be arranged one on either side of the selected leaf of the De-starched plant with the help of clips. Now the whole plant is kept in bright Sunlight for about 3-4 hours. Then the strips of black papers are removed from the experimental leaf and then starch test or Iodine test is conducted for the experimental leaf. Questions and answers related to the experiment
-What is the aim of the above experimental set up?
Ans. The aim of the above experimental setup is to prove that sunlight is essential for photosynthesis.
-What is the first step done before starting of this experiment? What is the importance of this step?
Ans. Before starting of this experiment De-starching of the leaves of the plant to be done. This step will be done to ensure that there is no starch in the leaves of the experimental plant.
-What do you understand by the De-starching? How the leaves of plant will be De-starched?
Ans. De-starching is the elimination of starch from the leaves of an experimental plant by keeping it in dark room for about two days.
Write the steps you follow to conduct Iodine test on the experimental leaf?
Ans. Write the four steps mentioned above under the heading "How to conduct starch test on the experimental leaf" and also mention the result of iodine test.
-Why the experimental leaf was dipped in hot boiling water?
The experimental leaf was dipped in hot boiling water to kill the cells of the leaf so that the metabolic process of the cells of the leaf will be stopped.
Why the leaf is boiled in mentholated spirit?
Ans. To remove chlorophyll pigment from the cells of the leaf.
-Why there is a difference in result of the iodine test in the covered and uncovered black paper regions of the experimental leaf?
Iodine test in the black paper uncovered region show a positive result for the presence of starch i.e iodine in this region turns into blue-black color. The reason for this is that uncovered region gets sunlight and so this part of the leaf is able to synthesize starch.
The black paper covered region give a negative result for starch i.e. iodine in this region turns into brown color. The reason for this is black paper covered region gets no sunlight and so this part of the leaf is not able to synthesize starch.
•Aim of the experiment:-
To prove Sunlight necessary for green plants to prepare their food.
•Requirements:-
A well watered potted green plant, two strips of black papers, small clips, spirit lamp or bun sen burner, test tube, beaker, Petr-dish, water, mentholated spirit or rectified spirit or ethanol, iodine solution.
•Procedure for the experiment
Before starting the experiment to prove Sunlight is necessary for photosynthesis an important step has to be carried out is known as De-starching. De-starching is a process in which the starch present in the leaves will be eliminated by keeping the plant in dark room or closed cup-board for about 48 hours. This step is done to ensure that previously manufactured food in the leaves get consumed when the plant was kept in dark place since photosynthesis doesn't occur at that time.
Next strips of black paper will be arranged one on either side of the selected leaf of the De-starched plant with the help of clips. Now the whole plant is kept in bright Sunlight for about 3-4 hours. Then the strips of black papers are removed from the experimental leaf and then starch test or Iodine test is conducted for the experimental leaf. Questions and answers related to the experiment
-What is the aim of the above experimental set up?
Ans. The aim of the above experimental setup is to prove that sunlight is essential for photosynthesis.
-What is the first step done before starting of this experiment? What is the importance of this step?
Ans. Before starting of this experiment De-starching of the leaves of the plant to be done. This step will be done to ensure that there is no starch in the leaves of the experimental plant.
-What do you understand by the De-starching? How the leaves of plant will be De-starched?
Ans. De-starching is the elimination of starch from the leaves of an experimental plant by keeping it in dark room for about two days.
Write the steps you follow to conduct Iodine test on the experimental leaf?
Ans. Write the four steps mentioned above under the heading "How to conduct starch test on the experimental leaf" and also mention the result of iodine test.
-Why the experimental leaf was dipped in hot boiling water?
The experimental leaf was dipped in hot boiling water to kill the cells of the leaf so that the metabolic process of the cells of the leaf will be stopped.
Why the leaf is boiled in mentholated spirit?
Ans. To remove chlorophyll pigment from the cells of the leaf.
-Why there is a difference in result of the iodine test in the covered and uncovered black paper regions of the experimental leaf?
Iodine test in the black paper uncovered region show a positive result for the presence of starch i.e iodine in this region turns into blue-black color. The reason for this is that uncovered region gets sunlight and so this part of the leaf is able to synthesize starch.
The black paper covered region give a negative result for starch i.e. iodine in this region turns into brown color. The reason for this is black paper covered region gets no sunlight and so this part of the leaf is not able to synthesize starch.
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Answer:
Sunlight in photosynthesis provides required energy to activate the enzymes required for photosynthesis.
HOPE THIS WILL HELP YOU
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