Which of the following is true for sexual reproduction in plants?
(A) Two plants are essential for sexual reproduction.
(B) Only insects are agents of pollination.
(C) Fertilization occurs only after pollination.
(D) Plants are obtained from seeds.
1
(B) and (D)
2
(A) and (B)
3
(A) and (D)
4
(C) and (D)