Protandry is a condition where......

What do plants develop various devices to promote?

Given below are two statements:
Statement $I$: In heteromorphic flowers,pollen grains produced from anther pollinate stigmas produced at same level.
Statement $II$: In Tobacco,the germination of pollen on the stigma of the same flower is inhibited.
In the light of above statements,select the correct option given below:

Cross-fertilisation is favoured by

When male and female flowers are produced on different plants in a species,the condition is called:

In plants,in nature,autogamy is avoided because the seeds produced: