Question

Which one of the following animals possesses a water vascular system?

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The correct option is A

The correct option is A:

Explanation of the correct option:

Option A:

1. It represents a ‘Star Fish.’
2. Starfish is a member of the phylum Echinodermata, which has a specialized water vascular system for excretion.
3. Apart from excretion, the water vascular system also helps in locomotion and respiration.

Explanation of the incorrect option:

Option B:

1. Option B represents a ‘Jelly Fish,’ which is a member of the phylum cnidaria that does not have a water vascular system.
2. Cnidarians have no special organ for excretion.
3. They mainly excrete through their body surface by diffusion.

Option C:

1. Option C represents ‘Crab,’ which is a member of the phylum Arthropoda that does not have a water vascular system.
2. Arthropods have specialized organs called Malpighian tubules for excretion.

Option D:

1. Option D represents ‘Hydra,’ which is a member of the phylum cnidaria that does not have a water vascular system.
2. Cnidarians excrete through their body surface by diffusion.

Final answer: Jellyfish possess a water vascular system.