Question

Male gametes are flagellated in

• A. Ectocarpus
• B. Spirogyra
• C. Polysiphonia
• D. Anabaena.

Answer 1

The Correct Option is A

To determine which of the provided options has flagellated male gametes, let's explore each organism:

1. Ectocarpus: This is a type of brown algae found in marine environments. Ectocarpus is known to possess flagellated male gametes. The flagella are essential for motility, helping the gametes reach the female gametes for fertilization.
2. Spirogyra: This organism is a filamentous green alga found in freshwater. Spirogyra reproduces through conjugation, which does not involve flagellated gametes but rather the fusion of non-motile gametes.
3. Polysiphonia: This red alga typically reproduces by means of non-motile gametes. The reproduction is usually through the transfer of spermatia (non-motile male gametes) to the carpogonium (female reproductive structure).
4. Anabaena: This is a genus of cyanobacteria (blue-green algae) that does not use flagellated cells for reproduction. It reproduces asexually by binary fission or through specialized cells known as heterocysts.

From the analysis above, Ectocarpus is the only option where male gametes are flagellated, aiding in their movement. This characteristic is essential for ensuring fertilization in aquatic environments.

Conclusion: The correct answer is Ectocarpus.