Biology – Class 12 Practice Test 2

1. Which of the following hormonal dosage is given as an oral administration to prevent pregnancy?

2. The factor which expresses in homozygous and heterozygous states is called _______

3. Egg is covered by a tough sheet of tissue that protects it from desiccation and infection by pathogens. But the same tissue also prevents sperm nuclei from encountering the egg nuclei. However, a part of sperm is known to release enzymes that digest this tough sheet. What part of sperm is it?

4. What happens after the weaning of an infant?

5. Luteal phase is characterized by the conversion of a ruptured Graafian follicle into _______

6. Apart from providing a medium for the exchange of nutrients, excretory products, and gases, the placenta is also an exocrine gland.

7. HIV can be transferred from an infected mother to the fetus

8. Who should be consulted to discuss the pros and cons of a contraceptive?

9. The menstrual cycle in humans lasts for a lunar month.

10. The sex of the human baby is male if ______