Question

Draw Gemmule in sponges and label the parts.

Hint:

Remember: Gemmule = Survival structure in sponges.

Answer 1

Concept: Gemmules are internal buds formed in freshwater sponges for asexual reproduction and survival during unfavorable conditions.
Step 1: Structure of gemmule.

• Outer protective layer (spongin coat)
• Spicules (for protection)
• Inner mass of archaeocytes (amoeboid cells)
• Micropyle (opening for exit of cells)

Step 2: Diagram (labelled).
\[ \begin{array}{c} \text{Spicules (outer protective layer)}
\bigcirc
\text{Spongin coat}
\bigcirc
\text{Archaeocytes (inner cells)}
\bigcirc
\text{Micropyle (opening)} \end{array} \]
Step 3: Conclusion.
Thus, gemmules help sponges survive adverse conditions and regenerate into new individuals.