Question

Dehiscence of anther in most of the angiosperms is
A)Porous
B)Valvular
C)Longitudinal
D)Transverse

Answer 1

Hint: In order to release its contents, dehiscence is the splitting, at maturity, along a built-in line of weakness in a plant structure and is common among fruits, anthers and sporangia. This sometimes involves a part's complete detachment. It is said that structures which open in this manner are dehiscent.

Complete answer:
Anthers are distinct units of pollen, present in the vast majority of angiosperms in stamens. Anthers usually consist of two compartments called thecae), with two microsporangia each containing theca (the fusion product of which is a locule). (Thus, anthers are usually tetrasporangiate.) The connective to which the filament (if present) is attached is called the tissue between and interconnecting the two thecae.Microsporangia, the immature male gametophytes of seed plants, are the development sites of pollen grains.

The final feature of the anther that activates the release of pollen grains is Anther dehiscence. This process is precisely coordinated with the differentiation of pollen, floral growth, and opening of flowers.

Another wall breaks down at a particular spot. This site is normally observed as an indentation between each theca's locules and runs the length of the anther, but it is instead a small pore in species with poricidal anther dehiscence. If the pollen is released through a break on the outer side of the anther (relative to the middle of the flower), this is extrusion dehiscence, and this is intrusion dehiscence if the pollen is released from the inner side.

If the pollen is released to other anthers, rather than to the inside or outside of the flower, through a split placed to the left, this is latrorse dehiscence.

The stomium is where dehiscence occurs in the area of anther. Porous dehiscence from another is seen in most angiosperms. The release of pollen from anthers through pores in the wall of the anther is porous dehiscence.

Hence, the correct answer is option (A)

Note: Four saclike structures (microsporangia) that produce pollen for pollination are composed of the anther. At the base of the stamens, small secretory structures called nectaries, are often found; they provide insect and bird pollinators with food rewards. Collectively, all the stamens of a flower are called androecium.