Question

The outer chitinous layer of the gemmule of a sponge is secreted by .............

• A. choanocytes
• B. interstitial cells
• C. amoebocytes
• D. archaeocytes

Hint:

Amoebocytes in sponges are versatile cells that can perform a range of functions, including secreting the chitinous layers of gemmules.

Answer 1

The Correct Option is C

Step 1: Understanding the question.
The question asks about the cell responsible for secreting the outer chitinous layer of a sponge’s gemmule.
Step 2: Analyzing the options.
(A) choanocytes: Choanocytes are the collar cells of sponges that are involved in feeding and water flow but do not secrete the chitinous layer of the gemmule.
(B) interstitial cells: These are cells found between other cells in sponges and do not play a role in secreting the chitinous layer of gemmules.
(C) amoebocytes: Correct — Amoebocytes are the cells that secrete the chitinous outer layer of the gemmule in sponges.
(D) archaeocytes: Archaeocytes are involved in many functions within sponges, such as reproduction and digestion, but are not responsible for secreting the chitinous layer of the gemmule.
Step 3: Conclusion.
The correct answer is (C) amoebocytes, as these cells are responsible for secreting the chitinous layer of the sponge's gemmule.