Dehiscence of Anther

• When the anthers become ripe they burst discharging the dry pollens. This act is called dehiscence and the time when this takes place is called anthesis.
• During the maturation of anther, various changes are takes place in walls of anther. In the beginning, middle layer degenerates due to absorption of food by tapetum.
• When the microspores are formed inside the pollen sacs, at the same time Ubisch bodies are formed in cells of tapetum, then after it degenerates…

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Microgametogenesis or Development of Male Gametophyte

In flowering plants, pollen grain or microspore considered as first cell of male gametophyte. Germination or development of pollen grain takes place before dehiscence of anther. So it is called as precocious development. Development of pollen also takes place at mother place [inside pollen sac of anther] is called In-situ development.

1. Pre Pollination development-
2. In the beginning of the process, only nucleus of pollen grain divided by unequal mitotic division,…

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Sexual Female Reproductive Organ – Gynoecium

• Gynoecium is the female reproductive organ. The free unit of gynoecium is called pistil or carpel.
• Carpel is also known as megasporophyll.
• The carpel is differentiating into three distinct regions – Stigma, Style and Ovary.

• The free end of the carpel which receives pollen grains is called stigma. A long, narrow tubular structure is present in between the stigma and ovary called style. The basal swollen part of the carpel is called ovary.…

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