Class – Aves : 1. Sexes are separate. 2. Fertilisation is external. 3. They are oviparous 4. Development is direct. Regarding 1,2,3 and 4:

Question

( a ) 2 is incorrect; 1,3 and 4 are correct
( b ) 4 is incorrect but 1, 2 and 3 are correct
( c ) 1 and 3 are correct but 2 and 4 are incorrect
( d ) 3 is incorrect but 1, 2 and 4 are correct