Differentiate between internal fertilisation and external fertilisation. What type of fertilisation takes place in (a) frog, and (b) fox?
(a) Frog-External fertilization (b) Fox-Internal fertilization
What type of fertilisation takes place in the following?
(a) Cow
(b) Frog
(c) Humans
(d) Fish
(e) Hen
(a) Explain the term 'fertilisation'. (b) Give some examples of different modes of fertilisation in nature ? (c) What type of fertilisation takes place in (i) fish, and (ii) birds ?