Choose the incorrect statement from the following:
1. | In birds and mammals, internal fertilisation takes place. |
2. | Colostrum contains antibodies and nutrients. |
3. | Polyspermy is prevented by the chemical changes in the egg surface. |
4. | In the human female, implantation occurs almost seven days after fertilisation. |
Acrosomal reaction of the sperm occurs due to
1. | its contact with zona pellucida of the ova |
2. | reactions within the uterine environment of the female |
3. | reactions within the epididymal environment of the male |
4. | androgens produced in the uterus |