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Pollen grain of Cycas are shed at stage...

Pollen grain of Cycas are shed at stage

A

One-celled

B

Two-celled

C

Three-celled

D

Four-celled.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks at which stage pollen grains of Cycas are shed. We need to identify the cellular stage of the pollen grain before it is released from the plant. 2. **Identifying the Stage**: Pollen grains of Cycas are shed at the three-cell stage. This is a crucial detail to remember. 3. **Types of Cells in the Pollen Grain**: The three cells present in the pollen grain of Cycas are: - **Prothalial Cell**: This is one of the cells that will be present in the pollen grain. - **Generative Cell**: This cell will eventually divide to form two sperms. - **Tube Cell**: This cell will develop into the pollen tube. 4. **Function of Each Cell**: - The **Tube Cell** will grow to form the pollen tube, which is essential for the fertilization process. - The **Generative Cell** divides into two cells: a sterile stalk cell and a fertile body cell, which produces two sperms. 5. **Sperm Characteristics**: The sperm produced by the body cell is notable for being one of the largest in the biological world, measuring approximately 300 micrometers, and is multi-flagellate, having several flagella. 6. **Conclusion**: Therefore, the correct answer to the question is that pollen grains of Cycas are shed at the three-cell stage. **Final Answer**: Pollen grain of Cycas are shed at the three-cell stage. ---
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