Question

The excretory organs of Gastrotricha are
A. Protonephridia
B. Solenocytes
C. Renette cell
D. Both A and B

Answer 1

Hint: Gastrotricha is a phylum that is made up of microscopic ventrally flattened animals, known as hairybacks. The excretory organs of this phylum are very much similar to the excretory organ of earthworms, and it consists of a specific kind of cells.

Complete answer: Animals of Gastrotricha are pseudocoelomate animals.
They are mainly found in freshwater and marine water.
The excretory system is made up of protonephridia that help the animals to remove excess water and some metabolic wastes from its body.
The protonephridia have some specialized cells, known as solenocytes.
A Renette cell is a supporting ultrastructure valve of nematodes that helps in Nematoda.

So, the correct answer is option D. Both A and B.

Additional information:
The Gastrotricha are worm-like pseudocoelomate animals. They are mostly benthic and the majority of these animals live on and between particles of sediment or on other submerged surfaces of the soil. Some species are terrestrial and live on land.

Note: Gastrotricha has a simple body plan – having a head, with a brain and sensory organs, and a trunk with a simple gut. They have an adhesive gland that helps them to anchor themselves with a substrate. The locomotory organ is the cilia. These animals use muscular pharynx to consume food, it feeds on detritus and sucks organic particles by using pharynx. They are hermaphrodites, meaning male and female entities in a single body. The species produce eggs that develop directly into miniature adults in marine water. They reproduce and give birth to young ones – thus, they are viviparous animals.