Which one of the following is the best reason for leaving a plant in a dark place before carrying out experiments on photosynthesis?
(a) To remove chlorophyll from the leaves.
(b) To increase the release of CO₂ by the leaves.
(c) To remove starch from the leaves.
(d) To stop synthesis process in the leaves.

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Solution

(c) To remove starch from the leaves

The reason for leaving a plant in a dark place before carrying out experiments on photosynthesis is to remove starch from the leaves.

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Similar questions

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.

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

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?

(i) Pluck the leaf to be experimented

(ii) Cover a portion of leaf on both sides by using strips of black paper

(iii) Keep the plant in dark place for three days to destarch its leaves.

(iv) Test the experimental leaf the the presence of starch

(v) Expose the plant to sunlight for four hours

(vi) Remove the black paper strip from the leaf

Given in the box are steps written randomly for the experiment to show that light is essential for photosynthesis. Which of the following sequences of steps is to be followed by the successful run of the experiment?

Q. When carrying out the starch test on a leaf, why is it important to boil the leaf in alcohol?
(a) to dissolve the waxy cuticle
(b) to make the cells more permeable to iodine solution
(c) to remove the chlorophyll
(d) to stop chemical reactions in the cells.

Two healthy green plants were placed in the dark for 24 hours. They were then set up as shown in the figure and were left for 4 hours. Then a leaf was taken from each plant and the chlorophyll was removed from the leaves.

What hypothesis is being tested in this experiment?

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(c) To remove starch from the leaves The reason for leaving a plant in a dark place before carrying out experiments on photosynthesis is to remove starch from the leaves.

(c) To remove starch from the leaves

The reason for leaving a plant in a dark place before carrying out experiments on photosynthesis is to remove starch from the leaves.