Question

Isogamous condition with non flagellated gametes is found in

• A. Fucus
• B. Chlamydomonas
• C. Spirogyra
• D. Volvox

Answer 1

The Correct Option is C

To determine which organism exhibits an isogamous condition with non-flagellated gametes, we need to understand a few key concepts:

Key Concepts:

• Isogamy: Isogamy is a form of sexual reproduction that involves gametes of similar size and shape. Both gametes are morphologically identical, though they may differ in genetic content.
• Non-flagellated Gametes: These are gametes that lack flagella, which means they cannot move on their own and rely on other mechanisms for reaching the counterpart gamete.

Analysis of Options:

• Fucus: Fucus is a brown alga that exhibits oogamous reproduction, where there are large, non-motile eggs and smaller, motile sperm. This does not match the isogamous condition with non-flagellated gametes.
• Chlamydomonas: Many species of Chlamydomonas reproduce isogamously, but they typically have flagellated gametes, allowing them to swim and reach each other.
• Spirogyra: Spirogyra is known for its isogamous form of sexual reproduction with non-flagellated gametes. In Spirogyra, gametes are similar in size and shape, and fusion occurs without movement since both gametes are non-motile and rely on processes like conjugation for reproduction.
• Volvox: Volvox, like Chlamydomonas, generally exhibits flagellated gametes, particularly in some strains where motile sperm is produced for reproduction.

Conclusion:

Among the given options, Spirogyra is correctly identified as exhibiting an isogamous condition with non-flagellated gametes. Spirogyra reproduces sexually through a process called conjugation, where filaments line up side by side and form conjugation tubes, allowing the exchange and fusion of similar gametes.

Answer:

The correct answer is Spirogyra.