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Photosynthesis

Chlorophyll i...

Question

Chlorophyll in a leaf is required for

(a) breaking down water into hydrogen and oxygen.

(b) emitting green light.

(c) trapping light energy.

(d) storing starch in the leaves.

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Solution

(c) trapping light energy.

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Q. In an experiment to test the presence of starch in a leaf, the plucked leaf is first boiled in water for a few minutes. This is an important step in the experiment because it :
(1) converts glucose made in the leaf into starch
(2) dissolves chlorophyll present in the green leaf
(3) extracts starch to destarch the leaf
(4) makes the leaf more permeable to iodine solution

Q. 1) Splitting of water molecules into hydrogen and oxygen by sunlight.
2) Absorption of light energy by chlorophyll 3) Reduction of carbon dioxide into carbohydrates.

Assertion: Chloroplasts contain chlorophyll which trap solar energy.

Reason: Plastids with green pigmentation help in storage of starch.

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 heap of green leaves is lying in one corner of a park. The green leaves in the heap burn with difficulty because :

(a) they contain a tough material called cellulose

(b) they contain a lot of water

(c) they contain a green pigment chlorophyll

(d) they do not get sufficient oxygen for burning

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