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Sexual Reproduction in Flowering Plants

Flower is the main reproductive organ of all the angiosperms . Angiosperms are flower bearing plants in which the seed is enclosed inside a fruit.

ANGIOSPERMS - Teachoo.jpg

  •  A flower has various different parts which include petals, sepals, stamens and pistils
  • Out of this, pistils and stamens are the main reproductive parts and contain germ cells or the sex cells. 
  • The pistil has the female gamete and the stamen has male gamete.

PARTS OF A FLOWER - Teachoo.jpg

A plant may be:

1. Unisexual: 

  • Having either pistil or stamen
  • Only one of the gametes is present (ether male or female)
  • Eg. Papaya, Watermelon

    

2. Bisexual:

  • Having both pistil and stamen
  • Male and female gametes are present in the same flower
  • Eg. Hibiscus, Mustard

Stamen: The Male Reproductive Organ of Flower

The stamen consists of two parts:

PARTS OF STAMEN - Teachoo.jpg

Anther:

  • Anther of the stamen is responsible for producing and storing pollen grains
  • The pollen grains appear as a  yellowish powder .
  • The pollen grains contain male gametes of the plant.  

Filament: 

It is a long tubular stalk which is attached to the anther.

Pistil: The Female Reproductive Organ of Flower

Pistil is also known as carpel and it consists of the following 3 parts:

PARTS OF PISTIL - Teachoo.jpg

Stigma: 

This is the uppermost part of the carpel which receives the pollen grains from anther. Stigma has a sticky surface so that the pollen grains can attach to it.

Style:

Style is the tubular middle portion of the carpel which is responsible for transferring the male gametes of pollen grains to the ovary.

Ovary:

It is a swollen structure present below style. Ovules which have the female gametes are produced and stored inside the ovary. The ovary contains many ovules. 

Note: There is a single female gamete present inside each ovule . The fertilization of male and female gametes takes place inside the ovule.

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Transcript

ANGIOSPERMS Flower Fruit Pistil Seeds PARTS OF STAMEN Stamen Anther Filament Stigma Style Ovary PARTS OF A FLOWER Anther Filament Stigma Style

CA Maninder Singh's photo - Co-founder, Teachoo

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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Economics, Accounting and English at Teachoo