Animal Kingdom Question 352
Question: Assertion : Sponges do not show any animal nature. Reason : Sponges are sessile with no apparent way of capturing food or eliminating water.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If the assertion is false but reason is true
Show Answer
Answer:
Correct Answer: D
Solution:
Robert Grant (1857) was the first to recognise and prove the true animal nature of sponges.
The animal nature of sponges was well established on the following grounds- (i) Sponges feed on inwafted solid particles.
Their mode of nutrition is truely holozoic.
(ii) Sponge cells are devoid of cellulose cell walls.
(iii) Life cycle of sponges include swimming ciliated larval stages resembling those of other marine animals.
Sponges are sessile and digestion is very simple without any apparent way of capturing food or eliminating wastes.
BETA
