Last seen: Dec 29, 2021
Correct answer: (a) 8 – nucleate, 7 – celled
Correct answer: (b) 7 – celled
Correct answer: (b) Guides the pollen tube into a synergid
Apomixis is the process of asexual production of seeds, without fertilization. The plants that grow from these seeds are identical to the mother plant...
Tapetum is the innermost layer of the microsporangium. The tapetal cells are multinucleated and polyploid. They nourish the developing pollen grains. ...
Oranges, lemons, litchis could be potential fruits for inducing the parthenocarpy because a seedless variety of these fruits would be much appreciated...
Emasculation is the removal of stamens mainly the anthers from the flower buds before their dehiscence. This is mainly done to avoid self-pollination....
Apple is called a false fruit because it develops from the thalamus instead of the ovary (the thalamus is the enlarged structure at the base of the fl...
Perisperm (i) It is unused nucellus in the seed. (ii) It is a part of seed. (iii) It is usually dry. (iv) It is often nonfunctional for seed. ...
Integument (i) It is the covering of the ovule. (ii) It is thin, one or two layered. (iii) Its cells are living. (iv) Sclereids are absent. ...
Coleoptile (i) The epicotyl bearing shoot apex and leaf primordia is enclosed in a foliar structure called coleoptile. (ii) Coleoptile has a termi...
Epicotyl (i) It is part of embryonal axis in between plumule and cotyledonary node. (ii) During hypogeal germination, epicotyl elongates so that c...
The zygote is dormant in fertilized ovule for some time because, at this time, endosperm needs to develop. As endosperm is the source of nutrition for...
Inside the embryo sac, one male gamete fuses with egg cells to form a zygote (2n) and this is called syngamy or true act of fertilisation. This result...
It is the covering of female plants with butter paper or polythene to avoid their contamination from foreign pollens during the breeding programme.
When the pollen grains of an anther do not germinate on the stigma of the same flower, then such a flower is called self-sterile or incompatible and s...
Two strategies evolved to prevent self-pollination are: Pollen release and stigma receptivity are not synchronized. Anthers and stigma are plac...
Chasmogamous flowers or open flowers in which anther and stigma are exposed for pollination. Cross-pollination cannot occur in cleistogamous flowers. ...
figure.png Fig: Normal or Polygonum type of embryo sac. The female gametophyte (embryo sac) develops from a single functional megaspore. Thus, t...
The female gametophyte or the embryo sac develops, from a single functional megaspore. This is known as the monosporic development of the female gamet...