A dicotyledonous plant bears flowers, but never produces fruits and seeds. The most probable cause for the above situation is

Autogamy can occur in a chasmogamous flower if

1. pollen matures before maturity of ovule

2. ovules mature before maturity of pollen

3. both pollen and ovules mature simultaneously

4. both anther and stigma are of equal lengths

Q. 12 A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by
1. insects     

2. water     

3. wind     

4. animals

From among the situations given below, choose the one that prevents both autogamy and geitonogamy.

1. Monoecious plant bearing unisexual flowers.

2. Dioecious plant bearing only male or female flowers.

3. Monoeciousplant with bisexual flowers.

4. Dioecious plant with bisexual flowers.