$(A)$ Parts of flower in Angiosperms :

$\rightarrow$ Flower is the reproductive unit in the angiosperms.

$\rightarrow$ It is meant for sexual reproduction.

$\rightarrow$  It has mid axis. It is called stalk or pedicel.

$\rightarrow$  The swollen end of stalk or pedicel is called thalamus. Four different kinds of whorls are arranged successively on it.

$\rightarrow$ These are calyx, corolla, androecium and gynoecium.

$\rightarrow$ Calyx and corolla are accessory organs, while androecium and gynoecium are reproductive organs.

$(i)$ Calyx : Calyx is the outer most whorl of the flower. It is made up of sepals. Sepals are green and leaf like in appearance and protects the plant in bud stage. Calyx can be Gamosepalous or polysepalous.

$(ii)$ Corolla : Corolla is located inside the calyx. They are of different shape and colour and attractive. Corolla can be Polypetalous or Gamopetalous, Petals attract insects for pollination.

$\rightarrow$ There is a variety of shape and colour of corolla in plants. Corolla can be tube shaped, bell shaped, funnel shaped or wheel-shaped.

$\rightarrow$ In some plants Androecium and Gynoecium, both are present. It is called bisexual flower.

$\rightarrow$ A flower having either only stamens or only carpels is called unisexual flower.

$(B)$ parts of flower on the basis of symmetry: