Question

The animal with tube-feets is
A. starfish
B. jellyfish
C. silverfish
D. crayfish

Answer 1

Hint: Echinoderms possess tube-feet as their locomotory, feeding and respiratory organ. Tube-feet are small projections arising from the body of those organisms. It arises from the oral end of an echinoderm.

Complete answer:
The water vascular system is present in echinoderms. It is composed of canals which in turn connect tube feet together. During locomotion water moves into tube feet and it expands.

Option A: Starfish, scientific name Asteroidea, commonly called sea stars or starfish is a class of echinoderm found underwater. They are bony in structure and are very colourful in appearance. They commonly possess five arms around a central disc but species with more than five arms also exist. They got regeneration ability. Their water vascular system is made of a network of canals. Starfish have tube-feet as an organ which helps them in locomotion, feeding and respiration. It is attached to the arms. It sticks to the ground and allows the organism to move forward. Therefore, this is the correct option.

Option B: jellyfish, belongs to the phylum cnidaria. They are made up of two cellular layers and mesoglea in between them. They move forward by releasing a pressure of water behind them.

Option C: silverfish, it is a small wingless insect which moves like fish and is grey in colour. It feeds on books and clothing.

Option D: Crayfish, belongs to the phylum arthropod. They look like lobsters.

Hence, the correct answer is option (A).

Note: Tube-feet are a part of the water vascular system. It is present on undersides of sea urchins and sea cucumbers. It is made up of two parts: ampulla and podium.