Class 12 Biology Zoology | Chapter 1 Reproduction in Organisms | Textbook Evaluation Questions | Q.No 14 | 12th Bio Zoology | Chapter 1 | QB 14
QUESTION NO 14 : Explain the different kinds of syngamy in living organisms.
Answer for obtaining full marks :
| Type of Sexual Reproduction | Example | Description |
|---|---|---|
| Autogamy | Actinosphaerium and Paramecium. | The production of both male and female gametes by the same cell or organism. |
| Exogamy | Human beings | The production of male and female gametes by separate parents. |
| Hologamy | Trichonympha. | - Occurs in lower organisms. - Organisms do not form specialized gametes. - The mature individuals themselves function as gametes. - The fusion of such mature individuals is termed hologamy. |
| Paedogamy | Actinophrys. | Sexual union between young individuals immediately following the mitotic division of the adult parent cell. |
| Merogamy | Protozoa. | The fusion of small-sized and morphologically distinct gametes. |
| Isogamy | Monocystis. | The fusion of gametes that are identical in both morphology and physiology. |
| Anisogamy | Higher invertebrates and all vertebrates. | - Anisogamy is observed in higher animals. - It involves the fusion of dissimilar gametes. |
Answer for Slow Learners :
- Autogamy (Actinosphaerium and Paramecium): The fusion of male and female gametes produced by the same cell or the same organism.
- Exogamy (Homo sapiens - Human beings): The fusion of male and female gametes produced by different parental organisms.
- Hologamy (Trichonympha):
- Observed in lower organisms.
- Organisms do not differentiate specialized gametes.
- The entire mature individuals function as gametes.
- The fusion of such mature individuals is termed hologamy.
- Paedogamy (Actinophrys): The sexual union between young individuals generated immediately following the mitotic division of the adult parent cell.
- Merogamy (Protozoa): The fusion of small, morphologically distinct gametes.
- Isogamy (Monocystis): The fusion of gametes that are morphologically and physiologically identical.
- Anisogamy (Higher invertebrates and all vertebrates):
- Anisogamy is prevalent in higher animals.
- The fusion of dissimilar gametes is designated as anisogamy.
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