Flowers are the reproductive part of the plant and helps in sexual reproduction to produce fruits and seeds. 
  • Stamens are the male part of a flower that consists - anthers (top of the stamen) and filament (stalk of filament).
  • Anther contains pollen grain which produce the male gametes.
  • Pollen grains have a tough coat which is protective and prevents from drying up. 
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  • The pistil is the female reproductive part.
  • Pistil consists of stigma, style and ovary. Stigma is the top part of a pistil, followed by the style (middle part) which connects the stigma to the ovary (base part of the flower). Ovary is the swollen (lowest) part of the pistil.
  • Ovary encases ovules (one or many) that are egg-like structures.
  • The female gamete or the egg is developed in an ovule.
In sexual reproduction, the male and the female gamete fuse to form a zygote by the process called fertilisation.
Types of flower
1. Flowers that contain either pistil or stamens alone are called unisexual flowers or incomplete flowers.
Watermelon, papaya and cucumber produce unisexual flowers
2. Flowers that contain both stamens and pistil are called bisexual flowers or complete flowers.
Sunflower, lily, rose, hibiscus and mustard have bisexual flowers.
Both male and female unisexual flowers may be present in the same plant or in different plants.