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Reactions Due to Light

Photosynthesi...

Question

Photosynthesis takes place is the presence of :

A

electricity

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B

sunlight

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C

heat

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D

negative catalyst

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Solution

The correct option is B sunlight
The chemical reactions that take place by absorbing light energy are called photochemical reactions.
For example, photosynthesis is a process in which light energy from the sun is used by the plants to prepare starch from carbon dioxide and water.

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Q. On completion of the experiment to demonstrate that ‘Light is necessary for photosynthesis’, four students reported the inference as follows. Identify the correct inference:
(1) Part of the leaf covered with strip can only undergo photosynthesis.
(2) Uncovered part of the leaf cannot synthesise starch
(3) Photosynthesis takes place only in the presence of sunlight
(4) Light is necessary for the synthesis of starch in green plants.

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[TEXTBOOK QUESTION -II(1)]

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