Tag: cross pollination

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Questions Related to cross pollination

Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

Outbreeding devices which is/are strcturally bisexual but functionally unisexual

  1. Dichogamy

  2. Herkogamy

  3. Dicliny

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

Continous self-pollination or inbreeding leads to inbreeding depression, a condition where the decrease in genetic vigor and vitality results in reduced fitness in offsprings.
Dichogamy is the condition in some flowering plants where the pistils and stamens mature at different times, thus preventing self-pollination.
It is of two types: protandry and protogyny.

So, the correct answer is 'Dichogamy'.

Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

Which of the following plants shows the self-sterility?

  1. Tobacco

  2. Potato

  3. Crucifers

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Incapability of pollen grains of one flower to grow over the stigma of the same flower due to the presence of similar sterile genes is called self-sterility. Ex: Tobacco, Crucifers, Potato and Gramineae.

So the correct option is 'Tobacco, Potato and Crucifers'.

Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

Self-sterility can be related to which of the following phenomena?

  1. Emasculation

  2. Sexual incompatibility

  3. Cross pollination

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Incapability of pollen grains of one flower to grow over the stigma of the same flower due to the presence of similar sterile genes is called self-sterility. Which a leads to emasculation, sexual incompatibility, and cross-pollination.

So the correct option is 'Emasculation, Sexual incompatibility, and Cross-pollination'.

Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

Cross-pollination is favoured by

  1. Self-sterility

  2. Dichogamy

  3. Herkogamy and heterostyly

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cross-pollination is when one plant pollinates a plant of another variety. The two plants' genetic material combines and the resulting seeds from that pollination will have characteristics of both varieties and is a new variety. Self-sterility in plants is enhanced to prevent self-fertilization and increase family diversification. Dichogamy is the ripening of the stamens and pistils of a flower at different times so that self-fertilization is prevented. Herkogamy is a common strategy employed by hermaphroditic angiosperms to reduce sexual interference between male (anthers) and female (stigma) function. Heterostyly is a unique form of polymorphism and herkogamy in flowers. In a heterostylous species, two or three morphological types of flowers, exist in the population. All these prevent self-pollination and favour cross-pollination.

So, the correct option is, 'all of these'.

Multiple choice botany pollination and fertilization types of pollination cross pollination pollination and its types

The phenomenon of maturation of anthers earlier than the stigma of the same flower is

  1. Dicliny

  2. Protandry

  3. Herkogamy

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

Heterostyly is the occurrence of 2-3 types of flowers within the same plant. Such flowers have a difference in length of styles and stamens.

Protandry is the condition when anthers mature before the stigma becomes receptive is called protandry. So, the condition in which the male reproductive organs of a flower mature before the female ones, and hence ensuring that self-fertilization does not occur.

Dicliny is the presence of only one kind of reproductive whorl in a flower.

Herkogamy is the condition in which the flower structure is such that even being bisexual. In some flowers, a mechanical barrier exists and thus self-pollination is not possible. Sometimes, there is a hood for covering the stigma.

So, the correct answer is B.