Explain structure of flower

Structure of a flower-

Sepal- The outer green leafy structure in a flower is called sepal. Petals make the first whorl of a flower. This whorl is called calyx. It protects the flower at bud stage.

Petals- The coloured leaf-like structures; next to the sepals; are called petals. The bright colours of the petals, attracts insects. This helps the plants in reproduction. The whorl formed by the petals is called corolla.

Stamens- Around the centre of the flower there are many little stalks with swollen tops. These are called Stamen. It is the male part of the flower. Each stamen consists of a green stalk called filament. A capsule-like structure; called anther is at the top of the stamen. The anther produces pollen grains. Pollen grains are powder like particles and take part in reproduction.

Pistil- It is the female part of the flower. It is a flask- shaped structure in the middle of the flower. It is divided into three parts.

1. Ovary- The lower broader portion of the pistil is called ovary. It contains the ovules which take part in reproduction.
    
2. Style- The narrow middle portion of the pistil is called style. 
    
3. Stigma- The sticky end at the top of the style is called stigma.