Reproduction in Plants

Learning Outcomes

  • Understand reproduction and its modes in plants.

  • Identify forms of asexual reproduction.

  • Comprehend natural and artificial methods of vegetative propagation.

  • Know about pollination, types, agents, and seed dispersal.

Modes of Reproduction in Plants

  • Asexual Reproduction: Involves simple division, no gametes involved.

    • Forms include: Budding, Fission, Fragmentation, Sporulation.

  • Sexual Reproduction: Involves formation of seeds from gametes, requires two parents.

Asexual Reproduction Details

  • Budding: New organism develops as an outgrowth from the parent.

  • Fission: Division of organism into two or more individuals.

  • Fragmentation: Breaking of the body into fragments, each grows into new individuals.

  • Sporulation: Formation of spores in a sporangium, dispersed in air.

Vegetative Propagation

  • Natural Methods: By roots, stems (tubers, rhizomes, bulbs).

  • Artificial Methods: Include stem cutting, layering, grafting, and tissue culture.

Sexual Reproduction Process

  1. Pollination: Transfer of pollen from anther to stigma.

    • Types: Self-pollination and cross-pollination.

    • Agents: Wind, water, insects, birds.

  2. Fertilisation: Union of male and female gametes to form a zygote.

  3. Seed and Fruit Formation: Zygote develops into seed, ovary into fruit.

  4. Germination: Seed develops into a new plant.

Seed Dispersal

  • Need for Dispersal: Prevents competition and ensures survival.

  • Methods: Wind, water, animals, explosive mechanisms.

  • Advantages: Broader range for species, reduces overcrowding.

  • Disadvantages: Seeds may land in unsuitable environments.

Germination Process

  • Seed absorbs moisture, radicle forms root, plumule forms shoot, leaves develop for photosynthesis.