Animal Kingdom Question 1024
Question: Spicules of silica occur in
[APMEE 2001]
Options:
A) Hyalonema
B) Sycon
C) Leucosolenia
D) Grantia
Show Answer
Answer:
Correct Answer: A
Solution:
Hyalonema is a marine form found 10-15 meters deep in the sea. Its skeleton consists of small spicules, which are siliceous in nature (consisting of silica).
It has a rounded or oval body with a spirally twisted root tuft.
Spicules of root tuft continue through the sponge body as an axis or columella and projects above as a gastral cone. Root spicules are compact, stalk-like and twisted giving the appearance of a rope.
The middle part of columella has symbiotic polyps So, the correct answer is ‘Hyalonema’
BETA
