To ensure that only the desired pollens fall on the stigma in the artificial hybridization process
A. The female flower buds of plants producing unisexual flowers 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.

B, C and D are correct. A and E are incorrect.

A. When conducting artificial hybridisation, it is essential to bag the female fl ower buds of plants producing unisexual flowers to prevent unwanted pollen from other sources from reaching the stigma.

B. Emasculation is the removal of anthers to prevent self-pollination and to ensure that only the desired pollen is used for cross-pollination. In unisexual flowers, the male and female reproductive organs are separate, so there is no need to emasculate the female flowers. 

C. After emasculation and crosspollination, it is crucial to bag the emasculated flowers to prevent any
unwanted pollen from other sources from reaching the stigma and interfering with the desired cross.

D. Emasculated flowers should be bagged after removing the anthers to ensure that no self-pollination occurs and that only the desired pollen is used for artificial hybridisation. 

E. Bisexual flowers showing protogyny can be selected for cross-pollination. Protogyny is a condition where the female reproductive organs mature before the male reproductive organs, reducing the chances of self-pollination and facilitating successful crosspollination.