Pls tell question 3 and 4 both

Dear student,
a) Tropism is Chemostropism: Growth in response to chemicals
b) 1-pollen grain,
2-pollen tube,
3-ovule,
4-ovary

c)auxins,  gibberellins are two growth hormones
d) Gymnosperms and angiosperms

Kindly post 4th question in a new thread for fast and efficient answering, we look forward to hear from you again.

Regards