List the parts of a flower, and describe the function of each part.

             Flower is the reproductive part of plant, consist of following four parts.

1. Sepals:
               They are green in colour and produced first in newly formed floral bud. They surround all other floral parts and protect them from environmental effects.

2. Petals:
               The second floral part of flower above the sepal is petal. They are of different colours may be yellow, purple, blue, orange or other colour. They contain nectar that attract insect and help in pollination.

3. Antheridium:
                        Also known as stamen. it is the male reproductive part of flower and consist of two parts:
a. filament
b. anther
Anther contain pollen sacs in which pollen grains are produced. Each pollen grain contain sperrn nuclei. 

4. Gynoecium:
                       It is the female reproductive part of flower. It consists of three main parts:
a. Stigma
b. Style, and
c. Ovary.
Ovary contain ovule in which egg cell is produced.