Which one is not the reason for the success of Mendel?

Which one is not a requirement for the success of vernalisation ?

What contribute to the success of Mendel?

Point out the reasons for Mendel’s success.

Point out the reasons for Mendel's success.

Which one among the following was not a possible reason for the success of Nadir Shah's military campaign in Delhi ?

What are the reasons for Mendel's success?