Question

Which of the following is a type of dehiscence by vertical slits
A. Extrose
B. Introse
C. Latrose
D. All of the above

Answer 1

Hint:- Angiosperms are the most developed type of plants among the whole plant kingdom. They are also called as flowering plants showing sexual reproduction.
The decision that the plant would flower takes place much before the actual flower is grown. Several hormonal and structural changes are initiated which lead to the differentiation and further development of the flower.

Complete answer:-
Plant growth cannot be determined easily, because plants retain the capacity for unlimited growth throughout their life. This ability of the plants is due to the presence of meristems at certain locations in their body.
As the plant matures, its structures start splitting their contents outside. This is called dehiscence of plant structure.
Most commonly dehiscence is seen in flowers. In the flowers, the male reproductive organ (anther) undergoes dehiscence and releases its contents.
Anther consists of a fibrous layer called endothecium. This layer is hygroscopic in nature. It absorbs water and moisture from the atmosphere and ultimately helps in dehiscence of the anther.
The dehiscence starts either from the apex or from the base of the anther thus called longitudinal dehiscence. This type of dehiscence occurs through the formation of various slits through which anther ruptures.
When the dehiscence occurs away from the centre of the flower, it is called as extrose dehiscence whereas the dehiscence which occurs towards the centre of a flower is called as introse dehiscence.
Sometimes pollen grains are released towards other anthers, this is called latrose dehiscence.

Thus the correct answer is option D.

Note:- Also dehiscence can be seen in fruits produced by the flowering plant. These fruits are called dehiscent fruits. Pericarp (outer layer) of these fruits gets ruptured after ripening, and seeds are dispersed outside.
Dehiscence in these fruits is of several types. These fruits develop a particular type of sutures from where the dehiscence takes place.