Practicing Success

Target Exam

CUET

Subject

Biology

Chapter

Sexual Reproduction in Flowering Plants

Question:

Read the given passage and answer the questions that follow:-

Plant breeders aim to create new and improved varieties by crossing different species, and sometimes even genera, to combine desirable traits. To achieve successful crossbreeding, it is crucial to ensure that only the intended pollen grains are used for pollination, while also protecting the stigma from any unintended contamination. This careful selection and controlled pollination process help breeders create commercially superior varieties with specific traits.

Read the given statements and choose the correct option.
Statement 1:- If the female parent produces unisexual flowers, still there is a need for emasculation. 

Statement 2:- When the stigma of a bagged flower attains receptivity, mature pollen grains collected from anthers of the male parent are dusted on the stigma, and the flowers are now resealed in preparation of future developments.

Options:

Both statements are correct.

Only statement 1 is correct

Only statement 2 is correct

Both the statements are incorrect.

Correct Answer:

Only statement 2 is correct

Explanation:

The correct answer is Option (3)- Only statement 2 is correct.

Statement 1: If the female parent produces unisexual flowers, still there is a need for emasculation. This statement is incorrect.

In the case of unisexual flowers, which have separate male and female flowers on the same or different plants, emasculation is not required. Emasculation is the removal of anthers from the flower to prevent self-pollination or unwanted pollination. However, in unisexual flowers, the female flowers lack functional male reproductive parts (anthers), so there is no need for emasculation.

Statement 2: When the stigma of bagged flowers attains receptivity, mature pollen grains collected from anthers of the male parent are dusted on the stigma, and the flowers are now resealed in preparation of future developments. This statement is correct.

After emasculation, bagging is a way of shielding emasculated flowers from unwanted pollen grains. Despite the fact that the flower is obscured by a bag, it achieves receptivity. Bagging is performed before the flowers open in unisexual flowers. The female flower is absolutely covered from contamination. The desired pollen is dusted on the stigma once the flower has achieved stigma receptivity. This has been resealed in preparation for future developments.