Tag: asexual and sexual reproduction in plants

Quizzes (23) Questions (89)

Questions Related to asexual and sexual reproduction in plants

Multiple choice self pollination asexual and sexual reproduction in plants botany

The condition of maturation of anthers and stigmas of the same flower simultaneously is

  1. Xenogamy

  2. Geitonogamy

  3. Allogamy

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

Geitonogamy: The transfer of pollen grains from the anther of a flower to the stigma of another flower borne by the same plant.

Xenogamy: Transfer of pollen grains from the anther of a flower to the stigma of another flower borne on a different plant but belonging to the same species.

Allogamy is the deposition of pollen grains from the anther of the one flower on the stigma of another flower, either in the same plant or in a different plant of the same species.

Homogamy: It is the condition in which flowers are bisexual anther and stigma mature at the same time to make self-pollination possible. Under this condition, the stigma receives the pollen grains from the anthers of the same flower by the agency of wind or insects.

 So, the correct answer is D.

Multiple choice self pollination asexual and sexual reproduction in plants botany

The condition of maturation of stigma before anthers of the same flower is

  1. Protandry

  2. Herkogamy

  3. Protogyny

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

Protogyny is the maturation of the stigma (female part) before the anthers (male part) in the same flower. Protandry is the opposite, where anthers mature first.

Multiple choice self pollination asexual and sexual reproduction in plants botany

Assertion (A):  Self ineompatibility is not an absolute phenomenon.
Reason (R): Even highly self-incompatible species can be self-pollinated by one stratagem or another.

  1. Both A and Rare individually true and R is the correct explanation of A

  2. Both A and Rare individually true and R is not the correct explanation of A

  3. A is true but R is false

  4. A is false but R is true Assertion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Self-incompatibility is a mechanism to prevent self-fertilization, but it can often be bypassed by techniques like bud pollination or high salt concentrations on the stigma. Thus, it is not an absolute barrier.

Multiple choice self pollination asexual and sexual reproduction in plants botany

Consider the following with reference to sporophytic (SSI) or gametophytic (GSI) self-incompatibility systems:
1. SSI-3 celled pollen, rejection reaction on the stigma
2. GSI -2 celled pollen, rejection reaction in the style. SSI -2 called pollen, rejection reaction in the style.
3. GSI- 3 celled pollen, rejection reaction on the stigma
Which of these features are correct in the case of sporophytic gametophytic self- incompatibility systems?

  1. 1 and 2

  2. 2 and 3

  3. 2 and 4

  4. 3 and 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Sporophytic Self-Incompatibility (SSI), pollen is typically 2-celled and rejected on the stigma. In Gametophytic Self-Incompatibility (GSI), pollen is typically 2-celled and rejected in the style.

Multiple choice botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

The nucellus of the ovule is:

  1. haploid

  2. diploid

  3. triploid

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

In seed plants, Ovule is the part of the female reproductive organ. It consists of three parts; Integument ( forming its outer layer) Embryo sac ( female gametophyte) and a Nucellus that is the central and largest part of the ovule as a source of nutrients for the embryo and its ploidy is diploid i.e 2n
Nucellus is derived from the apical portion of the ovule primordium of the ovule primordium and function as a megasporangium i.e, the nucellus produces the megasporocyte, which will undergo meiosis to form megaspores that is the reason that nucellus of the ovule is diploid in nature.
So, the nucellus of ovule is diploid.

So, the correct answer is 'diploid'.

Multiple choice botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

Ovule represents

  1. Microsporangium

  2. Megasporangium

  3. Gametophyte

  4. Embryo.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 Microsporangium  Pollen grains or male gamete
 Megasporangium  Ovules or female gamete
 Gametophyte  Sexual phase in the life cycle of the plant
 Embryo  Part of a seed, which is formed after fertilization

So, the correct answer is 'Megasporangium'

Multiple choice botany asexual and sexual reproduction in plants structure of male and female reproductive structures structure of ovule gynoecium

An angiospermic plant has to produce $88$ viable embryo sacs. How many meiotic divisions will be needed to produce equal number of female gametophytes by this plant?

  1. $88$
  2. $22$
  3. $44$
  4. $132$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Ovule contains the female gametophyte or the embryo sac. Each ovule usually contains only one embryo sac
Each embryo sac is formed by meiotic division of the diploid mother cell
The end result of a meiotic division is 4 haploid cells, in most cases, of the 4 haploid cells formed, three degenerate and  one develops into the embryo sac 
Therefore, to produce 88 viable embryo sacs 88 meiotic divisions are required
So, the correct answer is '88'