Select the wrong statement(s) regarding cross pollination.
(a) Pollination depends on external agent and so it is certain.
(b) New varieties are produced.
(c) Continuous cross pollination leads to weaker progeny.
(d) Germination capacity is highly declined.
(i) a and d
(ii) b and c
(iii) a, b and d
(iv) a, c and d
(iv) a, c and d
