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Life on the Earth

Question

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What are algae? Mention their common characteristics and types.

Solution

Algae are primitive plants in which the body is not divided into roots, stems and leaves. These are green and thus autotrophic in nature. Algae can prepare their own food in the form of glucose. The food is stored in the form of starch. The algae reproduce asexually by zoospores and sexually by gametes.

Question

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What is species diversity ?

Solution

The variation in the physical features of species.

Question

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What are three inorganic realms of the earth where life is present ?

Solution

They are Lithosphere, Atmosphere and Hydrosphere.

Question

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On what criteria the classification of kingdoms is done ?

Solution

The classification of kingdoms is made on the following criteria :

1. Complexity of cell structure.

2. Complexity of organism's body.

3. Mode of obtaining nutrition.

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