Question

Match LIST-I with LIST-II
\begin{tabularx}{0.8\textwidth}{|l|X|l|X|} \hline \multicolumn{2}{|c|}{LIST-I} & \multicolumn{2}{c|}{LIST-II}
\multicolumn{2}{|c|}{Type of cell in Porifera} & \multicolumn{2}{c|}{Functions}
\hline A. & Collar cells & I. & Line the sphincters
B. & Trophocytes & II. & Special nurse cells
C. & Pinacocytes & III. & Help to form spermatocyst
D. & Thesocytes & IV. & Food storage
\hline \end{tabularx}
Choose the most appropriate answer from the options given below:

• A. A - I, B - II, C - III, D - IV
• B. A - I, B - III, C - II, D - IV
• C. A - I, B - II, C - IV, D - III
• D. A - III, B - II, C - I, D - IV

Hint:

Break down the names of the cells to remember their function:

\textbf{Pina}cocyte: Think "Pin" or "Plate" - flat cells forming the outer layer.
\textbf{Choan}ocyte: Think "Collar" - collar cells.
\textbf{Troph}ocyte: Troph means "nourishment" (like in autotroph) - nurse cells.
\textbf{Thes}ocyte: Think "Thesaurus" or "Thesis" - a place for storage - food storage cells. \end{itemize}

Answer 1

The Correct Option is D

Step 1: Concept Overview:
Sponges (Phylum Porifera) exhibit a cellular level of organization, with specialized cells for diverse functions. This question assesses knowledge of these cells and their roles.

Step 2: Detailed Matching:
- A. Collar cells (Choanocytes): Flagellated cells creating water currents for feeding and respiration. They also differentiate into spermatocytes or surround developing sperm, forming a spermatocyst. Therefore, A matches with III.
- B. Trophocytes: Amoeboid cells digesting and distributing food, acting as special nurse cells, and nourishing other cells, including developing gametes. Therefore, B matches with II.
- C. Pinacocytes: Flattened, epithelial-like cells forming the outer surface (pinacoderm). Contractile cells regulate osculum and pore size, functioning like sphincters controlling water flow. Therefore, C matches with I.
- D. Thesocytes: Amoeboid cells specialized for food storage, accumulating glycogen, lipids, and proteins. Therefore, D matches with IV.

Step 3: Solution:
The correct matches are A-III, B-II, C-I, D-IV, corresponding to option (D).