Question: 121: To ensure that only the desired pollens fall on the stigma in artifical hybridization process :
(a) the female flower buds of plant producing unisexual flower need not be bagged.
(b) there is no need to emasculate unisexual flowers of selected female parent
(c) emasculated flowers are to be bagged immediately after cross pollination
(d) emasculated flowers are to be bagged after removal of anthers
(e) bisexual flowers, showing protogyny are never selected for cross
Choose the correct answer from the options given below :
(1) (a), (b) and (c) only
(2) (b), (c) and (d) only
(3) (b), (c) and (e) only
(4) (a), (d) and (e) only
Answer: Option (2)
Explanation:
Artificial hybridization is a technique used in plant breeding to ensure that only selected pollen grains fertilize the stigma of a selected female parent.
Statement (b) is correct because unisexual female flowers do not possess anthers,
so emasculation is not required.
Statement (d) is correct because in bisexual flowers, anthers must be removed (emasculation) and the flower must be bagged immediately after removal of anthers to prevent unwanted pollination.
Statement (c) is correct because after cross-pollination with desired pollen, the emasculated flower is again bagged to prevent contamination by foreign pollen.
Statement (a) is incorrect because even female flowers of unisexual plants are usually bagged to prevent unwanted pollination.
Statement (e) is incorrect because bisexual flowers showing protogyny can be selected for crossing as
self-pollination is naturally avoided.
Therefore, the correct combination is (b), (c) and (d).