Consider following features:
A: Organ system level of organisation
B: Bilateral symmetry
C: True coelomates with segmentation of body
Select the correct option of animal groups which possess all the above characteristics.
1. Annelida, Mollusca and Chordata
2. Annelida, Arthropoda and Chordata
3. Annelida, Arthropoda and Mollusca
4. Arthropoda, Mollusca and Chordata
I: | They exhibit organ-system level of body organisation and bilateral symmetry. |
II: | They are triploblastic, metamerically segmented and coelomate animals. |
III: | They possess only longitudinal muscles in their body wall which help in locomotion. |
IV: | A closed circulatory system is present. |
1. | Aquatic annelids like Nereis possess lateral appendages, parapodia, which help in swimming. |
2. | Nereis is dioecious. |
3. | Earthworm is monoecious. |
4. | Hirudinaria, blood-sucking leech, is an annelid that lacks true coelom and metamerism. |
1. | Flatworm | 2. | Roundworm |
3. | Annelid | 4. | Mollusc |