The allogamy is best favoured by

Exalbuminous seeds are of

Filiform apparatus is a characteristic feature of

Nitsch was able to get strawbarries of curious shapes by

The ovule in pea are

Rose plants produce large, attractive bisexual flowers but they seldom produce fruits. On the other hand a tomato plant produces plenty of fruits though they  have small flowers. Analyse the reasons for failure of fruit formation in rose.