What should come in place of ? in the given series?

Given below are two statements:

Which vegetable is grown by transplanting seedlings: 

The scientist who initiated cloud seeding experiments using silver iodide was

C4 plants have some advanced anatomical characters,Which crop has C ₄ photosynthesis pathway ?

Which of the following is a major advantage of privatization of extension services?

Which is a surface irrigation system?

DNA G is responsible for:

Match the following:

GC → TA transversion is caused by:

A year in which rainfall of a particular region is deficient by more than _______is known as drought year.