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Question

Choose the wrong statement(s) among the following

Statement 1: The tree tops stop a lot of light from entering the forest below where it is more darker and more humid

Statement 2: The availability of light on land is closely linked with that of temperature since the sun is the source for both

Statement 3: Trees below the top canopy adapt to have small leaves to maintain the minimal photosynthetic requirements.

Statement 4: The tops of the tallest trees adapt to have smaller leaves to prevent moisture loss.

A
Statements 1 and 2
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B
Statements 3 and 4
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C
Statement 3 only
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D
Statement 4 only
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Solution

The correct option is C Statement 3 only
Light is an important abiotic factor and the availability of light on land is closely linked with that of temperature since the sun is the source for both. Plants produce food through photosynthesis. This is only possible when sunlight is available as a source of energy.

A forest is composed of tree lines whose heights vary. The taller trees with its branches and leaves form an extensive canopy preventing sunlight from entering and reaching the ground. Thus the forest below remains dark, moist and humid. Furthermore, to prevent excessive transpiration, these tall trees adapt and make the leaf lamina smaller, thus reducing surface area.
Statement 3 is wrong, because trees below the top canopy adapt to have larger leaves to capture as much light as possible.

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