Class 7 Science - Chapter: Reproduction in Plants - Important Notes
1. Modes of Reproduction in Plants:
- Asexual Reproduction: Involves one parent, no gamete formation.
Examples: Fragmentation, Budding, Spore formation, Vegetative propagation.
- Sexual Reproduction: Involves two parents (male and female), fusion of gametes.
2. Asexual Reproduction Types:
- Vegetative Propagation: New plants from roots, stems, or leaves. (e.g., Potato, Bryophyllum)
- Budding: A small bud grows on parent body. (e.g., Yeast)
- Fragmentation: Organism breaks into fragments and each grows into a new one. (e.g.,
Spirogyra)
- Spore Formation: Spores are produced in sporangia. (e.g., Fungi)
3. Sexual Reproduction in Plants:
- Involves flower, the reproductive part of plant.
- Male part: Stamen (Anther + Filament) - produces pollen grains.
- Female part: Pistil/Carpel (Stigma, Style, Ovary) - contains ovules.
4. Pollination:
- Transfer of pollen from anther to stigma.
- Types: Self-pollination (same plant), Cross-pollination (different plant).
5. Fertilization:
- Fusion of male and female gametes.
- Zygote is formed which develops into embryo.
6. Seed and Fruit Formation:
- After fertilization, ovule becomes seed and ovary becomes fruit.
7. Seed Dispersal:
- Methods: Wind, Water, Animals, Explosion.
1. Modes of Reproduction in Plants:
- Asexual Reproduction: Involves one parent, no gamete formation.
Examples: Fragmentation, Budding, Spore formation, Vegetative propagation.
- Sexual Reproduction: Involves two parents (male and female), fusion of gametes.
2. Asexual Reproduction Types:
- Vegetative Propagation: New plants from roots, stems, or leaves. (e.g., Potato, Bryophyllum)
- Budding: A small bud grows on parent body. (e.g., Yeast)
- Fragmentation: Organism breaks into fragments and each grows into a new one. (e.g.,
Spirogyra)
- Spore Formation: Spores are produced in sporangia. (e.g., Fungi)
3. Sexual Reproduction in Plants:
- Involves flower, the reproductive part of plant.
- Male part: Stamen (Anther + Filament) - produces pollen grains.
- Female part: Pistil/Carpel (Stigma, Style, Ovary) - contains ovules.
4. Pollination:
- Transfer of pollen from anther to stigma.
- Types: Self-pollination (same plant), Cross-pollination (different plant).
5. Fertilization:
- Fusion of male and female gametes.
- Zygote is formed which develops into embryo.
6. Seed and Fruit Formation:
- After fertilization, ovule becomes seed and ovary becomes fruit.
7. Seed Dispersal:
- Methods: Wind, Water, Animals, Explosion.
