Question

2⃣ . Explain how you will classify animals on the basis of symmetry, germ layer , circulatory system and presence of coelom

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Answer 1

Answer:

We can classify hem as follows:-

Explanation:

1)symmetry

• Bilaterally symmetrical
• radial symetrical

2)Germ layer

• two germ layers(ectoderm and endoderm)
• three germ layer(ectodorm,endoderm and mesoderm)

3)Coelem

• Acoleomate
• Coelomate
• Pseudocoelomate

Answer 2

Process of classifying according to the given characters are :

1. Based on symmetry

If the body of an organism can't be divided into 2 halves with any plane passing through it, then the organism will fall under asymmetrical animal.

And animals whose body can be separated into two identical halves by any plane that passes through the central axis will fall under radially symmetrical animals.

The body of animal which can be separated into 2 halves that are identical only by 1 plane will be bilaterally symmetrical animals.

2. Germ layer

Animals possessing two layers, that is, the ectoderm and the endoderm are diploblastic organisms.

Animals having three layers (the ectoderm, the mesoderm and the endoderm) are triploblastic organisms.

3. Circulatory system

If the blood in an organism is circulated through veins and arteries, then the animals will possess open circulatory system.

If the blood is directly pumped and does not involve any passage through arteries or veins, then the animals will have closed type of circulatory system.

4. Presence of coelom

Animals having coelom are coelomates.

Animals that lack coelom are acoelomates.

Usefulness of classification :

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