Isogamous condition with non-flagellated gametes is found in
- Volvox
- Fucus
- Chlamydomonas
- Spirogyra.
Answer
(4) Spirogyra.
Solution
As per NCERT, fusion of two gametes similar in size is called isogamous; such gametes may be flagellated (e.g. Chlamydomonas) or non-flagellated (non-motile) (e.g. Spirogyra).
∵ Volvox and Fucus are oogamous, and the isogametes of Chlamydomonas are flagellated,
∴ isogamy with non-flagellated gametes is found in Spirogyra.
Answer: (4)