Question

4. Annelids have a
a. soft, unsegmented, bilaterally symmetrical body.
b. soft, cylindrical, segmented, bilaterally symmetrical body.
c. soft, segmented, bilaterally symmetrical body.
d. soft, segmented, laterally symmetrical body.​

Answer 1

a

soft , unsegmented bileteral symmetrical

Answer 2

Annelids are defined as triploblastic, bilaterally symmetrical, metamerically segmented, a coelomate worm with a thin flexible cuticle around the body.

main characters are :-

1. Symmetry and Size

2. Coelom

3. Body wall

4. Parapodia

5. Nervous system

6. Sense organs

7. Circulation and respiratory structures

8. Segmental organs

hence,

• They have a long and segmented body.

• Annelids are bilaterally symmetrical.

• They are triploblastic.

• Also, they exhibit organ system grade of organisation, showing organ differentiation.

• The body is covered with a thin cuticle.

• They are coelomate. A body cavity or coelom is present.

• Annelids live in moist environments, moist soil, freshwater and marine water.

• They have parapodia and chitinous setae, used for locomotion.

• Their body appears red due to the presence of haemoglobin.

• Excretory and nervous systems are present.

• The digestive system is complete and developed.

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