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Get Answers to all your Questions
- #Diversity in Living World
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- #National Eligibility Cum Entrance Test
In starfish the upper side contains
Option: 1
Mouth
Option: 2
Mouth and ambulacral grooves
Option: 3
Anus
Option: 4
Anus and madreporite
Answers (1)
Digestion in Echinoderms:
- They have a complete digestive system with mouth located on the ventral side and anus on the dorsal side.
Nervous System in Echinoderms:
- They have a simple nervous system with a central nerve ring and five radial rings. There is no grouping of nerves, so brain-like structure is absent.
Reproduction and Development in Echinoderms:
- They are dioecious animals. Sexes are separate.
- Usually external fertilization takes place.
- Development is indirect with the formation of free-swimming larvae.
- They also show high capacity of regeneration.
-
Anus is present on the upper surface of the body along with madreporite.
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