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: Understanding the Concept:
Sponges (Phylum Porifera) have a cellular level of organization with different cell types specialized for various functions. This question tests the knowledge of these specialized cells and their roles.

Step 2: Detailed Matching:
- A. Collar cells (Choanocytes): These are flagellated cells that create water currents for feeding and respiration. They also play a role in reproduction; they can transform into spermatocytes or surround developing sperm to form a spermatocyst. So, A matches with III.
- B. Trophocytes: These are amoeboid cells that are responsible for digesting and distributing food to other cells. They function as special nurse cells, nourishing other cells, including developing gametes. So, B matches with II.
- C. Pinacocytes: These are flattened, epithelial-like cells that form the outer surface (pinacoderm) of the sponge. They are contractile and can regulate the size of the osculum and pores, acting like sphincters to control water flow. So, C matches with I.
- D. Thesocytes: These are amoeboid cells that are specialized for food storage. They accumulate food reserves like glycogen, lipids, and proteins. So, D matches with IV.

Step 3: Final Answer:
The correct set of matches is A-III, B-II, C-I, D-IV. This corresponds to option (D).