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Uses of Oxygen

The source of...

Question

The source of oxygen for the aquatic animals is ________.

A

soil

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B

water

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C

air

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D

land

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Solution

Explanation:
Water has dissolved oxygen which is used by the aquatic life for respiration.
Oxygen dissolves into water from two sources.
The atmosphere and from plants in water.
The primary source of oxygen through photosynthesis of submerged plant.
Hence, option (A) is correct.

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Question 18

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(a) Saline water, hot air and sand are ........components of a habitat.

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1. Air is not one substance but a ……………………..
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