Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

In which of the following meiosis takes place?

  1. Pollen grains

  2. Pollen tube

  3. Pollen mother cells

  4. Generative cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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.

Multiple choice botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

Which part of plant is suitable for the study of meiosis?

  1. Root apex

  2. Ovary

  3. Anther

  4. Shoot apex
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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.

Multiple choice botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

Meiotic division occurring just at the time of gametogenesis is 

  1. Sporic

  2. Initial

  3. Intermediate

  4. Terminal
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • In plants, meiosis is occurring as in diploid sporophyte to produce haploid spores. 
  • The haploid spores are germinating to produce structures called gametophytes. The gametophytes then produce gametes. 
  • Gametic or the terminal meiosis occurs in all multicellular animals. It takes place in the gonads and hence as results in the formation of gametes. 
  • It is responsible for gametogenesis and does not give rise to gametophytes.
  • The correct option is D.

Multiple choice botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

Development of female gametophyte directly from megaspore mother cell without meiosis is called.

  1. Apogamy

  2. Apospory

  3. Syngamy

  4. Parthenospore
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

Multiple choice botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

Read the given statements.


(i) The outer exine is made up of sporopollenin.
(ii) Inner intine is pecto-cellulosic in nature.
(iii) Generative cell is bigger and contains abundant food reserve.
(iv) Vegetative cell is small and floats in the cytoplasm of the generative cell.

Which of the given statements are not true regarding the structure of pollen grain?

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (i) and (iv)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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).