Hi,
The weightage of plant physiology in neet exam is nearly about 13 percent and on an average 8 questions are asked every year from it.
The highest weightage in botany is of genetics and biotechnology which is 24% and nearly 15 questions are asked every year .
Whereas in zoology the highest weightage is of human physiology which is 45% and 13 questions are asked on an average from it . So prepare these topics with more focus.
Hope it helps.