Question

(v) No genetic variation can occur in the progeny, in case of
(a) cleistogamy
(b) autogamy
(c) geitonogamy
(d) all of these​

Answer 1

Answer:

The correct answer is (d) all of these

All the options provided possess no genetic variation that can occur in the progeny.                                                  

Explanation:

• Pollination in plants is of two main types namely- self-pollination and Cross-pollination.

• Self-pollination refers to the transfer of pollen from the anther of a flower to the stigma of the same flower (or flower of the same plant).

• Self-pollination can be of two types, autogamy and geitonogamy.

• Autogamy is a type of self-pollination that is found only in bisexual flowers. In this case, the stigma of a flower is pollinated by its pollen.
• Autogamy includes (a) Cleistogamy - The flowers such as Viola remain closed during pollination (with the help of its petals) Thus, the stigma receives only the pollen of its own flower.

• It is the best contrivance for self-pollination.

• (b) Geitonogamy type of pollination refers to the transfer of pollen grains of one flower to the stigma of another flower in the same plant or genetically identical plant.

Advantages of self-pollination -

(a) It maintains the purity of the species, by preserving all the parental characters

(b) It is used to obtain pure-line characters (homozygosity) during breeding experiments. So that no variation occurs and produces genetically similar plants.

(c) Plants have no dependency on pollinating agencies.

(d) Only a small number of pollen grains are required.

(e) Self-pollination strengthens the better characters of the plant.

Hence the most appropriate correct answer is option d. all of these.

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Answer 2

Answer:

(D) All of these​

Explanation:

Pollination in plant life is of  foremost kinds namely- self-pollination and Cross-pollination.

Self-pollination refers back to the switch of pollen from the anther of a flower to the stigma of the equal flower (or flower of the equal plant).

Self-pollination may be of  kinds, autogamy and geitonogamy.

Autogamy is a form of self-pollination this is observed best in bisexual vegetation. In this case, the stigma of a flower is pollinated with the aid of using its pollen.

Autogamy includes (a) Cleistogamy - The vegetation which includes Viola continue to be closed at some point of pollination (with the assist of its petals) Thus, the stigma gets best the pollen of its very own flower.

It is the excellent contrivance for self-pollination.

(b) Geitonogamy form of pollination refers back to the switch of pollen grains of 1 flower to the stigma of some other flower withinside the equal plant or genetically equal plant.

So, all the alternatives supplied own no genetic version which can arise withinside the progeny.

What will happen if variations are not present in organisms?​

https://brainly.in/question/8419579?msp_srt_exp=4

Genetic variation occurs by?

https://brainly.in/question/9302936?msp_srt_exp=4

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