The Reproductive structure of the Angiosperms MCQ - Practice Questions with Answers

Updated on Sep 18, 2023 18:34 AM

Quick Facts

Ray florets have

Inferior ovary

Superior ovary

Hypogynous ovary

Half inferior ovary

Revision of Flower- The Reproductive structure of the Angiosperms

The organs specialised to perform sexual reproduction in the angiosperms are called flowers.
We have read the details of inflorescence and parts of flowers in the chapter morphology of flowering plants.
Flowers are modified condensed reproductive shoots.
Flowers are formed when the appropriate conditions set for the reproductive maturity of the plant.
This occurs in response to the hormones we have discussed in plant physiology lectures.
Hormones bring about physiological changes in the shoot apices wherein, the shoot apices are transformed into an inflorescence over which floral primordia develop.
The primordial grow into floral buds which undergo anthesis to form flowers.
A typical flower has a base called the thalamus which bears the four whorls as:
- Calyx made of sepals
- Corolla made of petals
- Androecium made of stamens
- Gynoecium made of the pistil
This chapter will focus on the stamens and pistil because these are the male and female reproductive parts of a flower.

Stamen

Stamen is the male reproductive organ or the microsporophyll of a flower.
There are two parts of a typical stamen – the long and slender stalk called the filament, and the terminal generally bilobed structure called the anther.
The proximal end of the filament is attached to the thalamus or the petal of the flower.
The number and length of stamens are variable in flowers of different species.
A typical angiosperm anther is bilobed or dithecous.
The anther is the fertile part of the stamen.
The two lobes of the anther are separated in the anterior region by a deep groove.
On the backside, the two lobes are connected by a sterile parenchymatous tissue called connective.