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Photosynthesis Experiments

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Question

Which substance is used to remove chlorophyll from a green leaf during photosynthesis experiments?

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Solution

Alcohol is used to remove chlorophyll from a green leaf during photosynthesis experiments.

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In which substance the leaf is boiled to remove the green pigment, chlorophyll from it?

Q. A variegated leaf with green and yellow paths in used for an experiment to prove that chlorophyll is required for photosynthesis. Before the experiment, the green portions

(A)

, and the pale yellow portions

(B)

, are observed. What will be the color of

^{'} A^{'}

just before and after the starch test? Also, write the equation of photosynthesis and mark well as validate from which molecule the by-product is obtained.

Q. In the experiment to show that sunlight is necessary for photosynthesis:
(a) What is done to destarch the green leaves of the potted plant initially?
(b) What is done to a part of destarched leaf so that photosynthesis may not take place in that part of the leaf (before keeping the potted plant in sunlight)?
(c) How is chlorophyll removed from the green leaf before further testing?
(d) Which reagent is used to test the presence/absence of starch in the parts of experimental leaf?

Q. In the experiment to demonstrate that starch is made as food by the process of photosynthesis, the plucked leaf is first boiled in water for about 3 to 5 minutes in order to :

(1) remove chlorophyll from leaf cells

(2) break down the cell membranes of leaf cells

(3) soften the brittle leaf

(4) convert starch into glucose so that is can be tested easily

A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis in order to

(a) remove chlorophyll from the leaves.

(b) remove starch from the leaves.

(c) ensure that no photosynthesis occurred.

(d) ensure that the leaves are free from starch.

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