Question

Glochidium larva is found in

• A. Pola
• B. Unio
• C. Sepia
• D. Asterias

Answer 1

The correct option is B

Unio

The correct option is B.

Explanations of correct option:

Option B:

1. The glochidium larva is found in the family Unionidae.
2. Unionidae family consists of animals like clams, oysters, mollusks, etc.
3. These mollusks have bivalve shells and a false mantle (soft body wall covering).
4. It is an immature free-living form.
5. Before the juvenile larva metamorphoses into juvenile mussel, it has hooks that help it to attach to other fish, which prevents it from falling into the substratum.
6. Hence, due to the attachment ability, the mollusk larvae can reach new habitats along with the moving fishes.

Explanations of incorrect options:

Option A:

1. Pola is a true bug.
2. It is an insect belonging to the family Scutelleridae.

Option C:

1. Sepia is also known as cuttlefish.
2. These are marine mollusks.
3. They are categorized into the class Cephalopoda and the family Sepiidae.
4. Their shell is made up of aragonite known as cuttlebone, which monitors the ratio of water and air inside the shell, allowing them to float.

Option D:

1. The genus family of sea starfish is known as Asterias.
2. It belongs to the phylum Echinodermata and the family Asteridae.
3. These animals have a shape of a star and can regenerate their arms.

Final answer: Glochidium larva is found in Unio.