Question

2. Amphioxus contains about
a) 180
b) 500
solenocytes in each protonephridium.
c) 50
d) 320​

Answer 1

Answer:

In Amphioxus there are 90 to 100 pairs of protonephridia present segmentally on dorso-lateral pharyngeal wall one above each gill slit on either side.

Answer 2

Amphioxus contains about 500 solenocytes in each protonephridium.

Explanation:

1. There are about 90-100 pairs of the protonephridium present in Amphioxus.

2. Solenocytes inside the protonephridium help in the excretion and osmoregulation of the organism.

3. The phylum Platyhelminthes bears protonephridia and the organisms are ammonotelic in nature.