To ensure that only the desired pollens fall on the stigma in artificial hybridization process Choose the correct answer from the options given below
- A, D and E only
- A, B and C only
- B, C and D only
- B, C and E only
Answer
(3) B, C and D only
Solution
As per NCERT, in artificial hybridisation the stigma must be protected from contamination by unwanted pollen; this is achieved by emasculation and bagging.
A: If the female parent bears unisexual flowers, there is no need for emasculation, but the female flower buds are bagged before the flowers open ⇒ incorrect.
B: Unisexual female flowers have no anthers, so emasculation is not needed ⇒ correct.
C: After dusting the desired pollen on the stigma, the flowers are rebagged immediately ⇒ correct.
D: Emasculated flowers are covered with a butter-paper bag (after removal of anthers) to prevent contamination of the stigma ⇒ correct.
E: Bisexual flowers can be used for crossing after emasculation; protogyny (stigma maturing before the anthers) is no reason to reject them ⇒ incorrect.
∴ B, C and D only.
Answer: (3)