Question

Assertion: the first step in artificial hybridisation is removal of anthers.
Reason : it prevents contamination of anthers

A) if both a and b are true and b is the correct explaination.
B) if both a and b are true but b is not the correct explanation of b
C) if a is true but b flase
D) if both a and b are false

Answer 1

The first step in artificial hybridisation is the removal of anthers as it prevents contamination of sigma (Option C)

• Artificial hybridisation is a type of plant crossing where only the desired pollens are used for pollination of the stigma. Contamination is prevented by two steps- emasculation and bagging.
• Emasculation is the process of removal of anthers in the bisexual flower in order to prevent autogamy. This is followed by covering the stigma of the flower with a bag to prevent contamination by unwanted pollen. This is called Bagging.
• When the bagged stigma attains receptivity, mature pollen of the desired male parent is collected, dusted on the stigma, and the flower is rebagged to allow fertilization.

Answer 2

Answer:

C)Assertion: the first step in artificial hybridisation is removal of anthers.

Reason : it prevents contamination of anthers.

Assertion true and reason false.

Explanation:

• Artificial hybridization is a pollination and fertilisation method in which only selected pollen grains are employed.
• Hybridization is a process of selective breeding, as we all know. Anthers must be removed from a bisexual bloom before pollen grains can be released. Emasculation is the process of removing an anther with forceps. This step is not required in the case of unisexual blooms.
• Covering such flowers that have had their anther removed to prevent pollen contamination of the stigma.