Write a note on Angiosperms.

$\rightarrow$ In the Angiosperms or flowering plants the pollen grain and ovules are developed in specialised structures called flowers.

$\rightarrow$  Seeds are enclosed by fruit.

$\rightarrow$  The angiospems are an exceptionally large group of plants occurring in wide range of habitats. They range in size from tiny, almost microscopic wolfia to tall trees of Eucalyptus (over 100 metres) grow in Australia.

$\rightarrow$  They provide us with food, fodder, fuel, medicines and several other commercially important products.

$\rightarrow$ Classification of Angiosperms : Angiosperms are classified in two classes :

$(i)$ Dicotyledons and $(ii)$  Monocotyledons.

$(i)$ The dicotyledons : There are two cotyledons in dicotyledons.

$\rightarrow$ Leaves possess reticulate venation and flowers are Tetramerous or pentamerous (Means there are four to five members in each flower).

$(ii)$ Monocotyledons : There is only one cotyledon in seed of monocotyledons leaves possess parallel venation and flowers are trimerous [means there are three members in flower cycle]

$\rightarrow$ The male sex organ in a flower is stamen. Each stamen consists of a slender filament with anther at the tip. The anthers, following meiosis, produce pollen grains. Pistil consists of an ovary enclosing one to many ovules, style and stigma. In ovules female In the Angiosperms or flowering plants the pollen grain and ovules are developed in specialised structures called flowers.

$\rightarrow$ Seeds are enclosed by fruit.

$\rightarrow$ The angiospems are an exceptionally large group of plants occurring in wide range of habitats. They range in size from tiny, almost microscopic wolfia to tall trees of Eucalyptus (over 100 metres) grow in Australia.

$\rightarrow$ They provide us with food, fodder, fuel, medicines and several other commercially important products.