Botany and Plant Science

Site of meiosis in Angiosperms is the spore mother cell. 

In plants, meiosis can be observed in sporangia. A microsporangium is the part of plant is suitable for the study of meiosis. A typical anther contains four microsporangia. The microsporangia form sacs or locules in the anther. The two separate locules on each side of an anther may fuse into a single locule. Each microsporangium is lined with a nutritive tissue layer called the tapetum and initially contains diploid pollen mother cells. These undergo meiosis to form haploid spores. The spores may remain attached to each other in a tetrad or separate after meiosis.

The site of meiosis in higher plants is the spore mother cell.  In land plants and some algae, there is an alternation of generations such that meiosis in the diploid sporophyte generation produces haploid spores. These spores multiply by mitosis, developing into the haploid gametophyte generation, which then gives rise to gametes directly. In both animals and plants, the final stage is for the gametes to fuse, restoring the original number of chromosomes.

Meiosis occurs in microspores mother cells which are diploid cells; to produce microspores or pollen grains. Each microspore mother cell produces four microspores after a meiotic division.

Anther is the part of plant is suitable for the study of meiosis. A typical anther contains four microsporangia. The microsporangia form sacs or locules in the anther. The two separate locules on each side of an anther may fuse into a single locule. Each microsporangium is lined with a nutritive tissue layer called as the tapetum and initially contains diploid pollen mother cells. These undergo meiosis to form haploid spores. The spores may remain attached to each other in a tetrad or separate after meiosis.

In flowering plants like tomatoes, meiosis occurs in the microspore mother cells (within the anther) and megaspore mother cells (within the ovule) to produce haploid spores.

One meiotic division of a microspore mother cell produces 4 pollen grains. Therefore, 1000 pollen grains require 1000 / 4 = 250 meiotic divisions.

Meiosis occurs within the anther, specifically in the microspore mother cells, to produce pollen grains. The other options are either somatic tissues or the final product.

Apospory is the development of a gametophyte directly from the sporophyte tissue (like the megaspore mother cell) without meiosis, resulting in a diploid gametophyte.

Apospory is the formation of a gametophyte from the sporophyte without the reduction division (meiosis).

In a mature pollen grain, the generative cell is smaller and the tube(or vegetative) cell is larger. In the later stages of development of pollen grain, callose dissolves and the naked generative cell comes to lie freely in the cytoplasm of the tube cell. The tube cell has a cytoplasm that is rich in the food reserve (starch, protein, fat with mostly unsaturated fatty acids).

The male cones are borne in a cluster on a branch of unlimited growth behind the apical bud, in the axil of a scale leaf. A cone consists of a central axis bearing 60- 135 microsporophylls in spiral manner. It is therefore, comparable female flower of angiosperm.

The formation of the plant from gametophytic cell without fertilization is called apogamy.

Seedless fruits are produced by bypassing fertilisation of ovule by the pollen. In such cases the ovule degenerates and seeds are not formed. The same process is carried out in banana to produce seedless fruits and it is called parthenogenesis. The fruits of such trees are harvested and the species propagation is artifically carried out a means of asexual reproduction known as cutting. The correct answer is 'Parthenogenesis'.