Self pollination is when a flower receives pollen from itself or another flower on the same plant, while cross pollination is when pollen comes from a different plant of the same species.

Simple definitions

  • Self pollination : Transfer of pollen from the anther to the stigma of the same flower, or to another flower on the same plant.
  • Cross pollination : Transfer of pollen from the anther of a flower on one plant to the stigma of a flower on a different plant of the same species.

Think of self pollination as “within one plant,” and cross pollination as “between two plants.”

Mini story to remember

Imagine a plant named Asha growing alone in a corner.

  • On windy days, her own pollen falls onto her own stigma – that is self pollination, so Asha can make seeds even without any neighbours.
  • In another garden bed, Asha has a friend, Rohan (another plant of the same species). Bees carry pollen from Asha to Rohan and back; that is cross pollination, mixing both their traits in the new seeds.

Main differences (quick view)

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Feature Self pollination Cross pollination
Source of pollen Same flower or same plant.Different plant of the same species.
Genetic variation Low; offspring very similar to parent.High; mixes characters from two parents.
Need for pollinators (insects, wind, etc.) Often not needed; plant can manage by itself.Usually needs wind, insects, birds, or other agents.
Energy cost to plant Lower; flowers can be small, with little or no nectar or scent.Higher; flowers often larger, colourful, scented, with nectar.
Adaptation advantage Good for stable environments; helps maintain pure parental traits.Good for changing environments; more variation helps survival and evolution.
Risk Can reduce genetic diversity and long‑term fitness (“inbreeding”).May waste more pollen and depends on pollinators, but maintains diversity.

Key points (exam‑style)

  1. Self pollination: same flower or same plant; low variation; does not depend much on pollinators.
  1. Cross pollination: different plants; high variation; depends on agents like wind, insects, birds, or water.
  1. Many crops use both strategies, but farmers often prefer cross‑pollinated seeds for stronger, more diverse plants.

Information gathered from public forums or data available on the internet and portrayed here.