Question

What are the 4 types of flowers?

Answer 1

Hint: Types of flower on the basis of aestivation which the arrangement of the parts of a flower within a flower bud before it has even opened.there are four types of aestivation. The flower is a reproductive organ. It contains sexual organs like carpel and stamen. Stamen is a part of male reproductive structure while carpel is female reproductive structure.

Complete answer:
There are 4 main types based on aestivation:-
1. Valvate- sepals and petals arranged in a whorl just to touch one another as seen in calotropis.
2. Twisted- one margin of the sepal or petal overlaps the next one as seen in china rose and cotton.
3. Imbricate- one margin of sepal or petal overlaps the next but not in a particular way . eg- Gulmohar.
4. Vexillary- its an unique arrangement with 5 petals in which the largest on( standard) overlaps on the two wings which then overlaps the two small petals called keel.
Bisexual flowers are the floweres in which both the sexual organs are present in the same flower i.e. androecium and gynoecium is present in the same flower .eg- rose etc
unisexual flowers are the ones containing only one sexual part i.e. either androecium or gynoecium. The flowers containing male parts are known as staminate while the ones carrying the female parts are known as pistillate. eg- papaya, cucumber etc.
actinomorphic are the flowers having radial symmetry. eg- ranunculaceae family
zygomorphic are the flowers with bilateral symmetry. eg- fabaceae family
Fusion of gametes takes place to form a zygote which is diploid which further forms seed, fruit etc. Fusion of gametes requires pollination which is a process by which gametes come towards each other. it can take place through water, air or animals.

Note:
Flowers can be classified on the basis of sexuality as bisexual and unisexual or symmetry as actinomorphs and zygomorphs. Some animals that pollinate bisexual flowers are bees, bumblebees, sheep etc. they suck up the nectar in the form of reward of pollinating the flower.