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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

Fill in the blanks:

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

(b) The habitat of plants and animals that live in ........ is called the aquatic habitat.

(c) ........enable a plant or an animal to live in its surroundings.

(d) Plants and animals that live on land are said to live in ........habitats.

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1. Air is not one substance but a ……………………..
2. When air is in ………………. it is called wind.
3. Our earth is surrounded by ………………………...
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5. Air contains ………………… particles.
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