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CBSE TEST PAPER-10 
CLASS - XII BIOLOGY (Human Reproduction) 
1. At what stage is the mammalian embryo implanted in uterus? [1] 
2. Despite the presence of So many sperms in the vicinity of an egg cell, only
one sperm enters the ovum. Why? 
[1] 
3. How many polar bodies are given out in production of one egg during
cogenesis? 
[1] 
4. Why testes of human males are considered extra abdominal? What is the
significance of this condition? 
[2] 
5. Draw a diagram of the T.S. of seminiferous tubule of testis of an adult human
male & label any four parts in it. 
[2] 
6. What is colustrum? What is its significance to new born baby? [2] 
7. A sperm has just fertilized a human egg in the fallopian tube. Trace the
events that the fertilized eggs will undergoes upto implantation of blastocyst 
in the uterus. 
[3] 
8. Where oogenesis does takes place. Describe the stages of this process? [3] 
9. A woman has conceived & implantation has occurred within her uterus.
Discuss the sequence of changes up to parturition which will take place 
within her body under the influence of various hormones. 
[5] 
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FAQs on Human Reproduction Test-3 - Class 12

1. What are the primary reproductive organs in humans?
Ans. The primary reproductive organs in humans are the testes in males and the ovaries in females. These organs produce the gametes (sperm and eggs) necessary for reproduction.
2. How does fertilization occur in humans?
Ans. Fertilization in humans occurs when a sperm cell fuses with an egg cell, forming a zygote. This process typically takes place in the fallopian tubes, where the sperm meets the egg after sexual intercourse.
3. What is the role of hormones in human reproduction?
Ans. Hormones play a crucial role in human reproduction. In males, the hormone testosterone is responsible for the development of secondary sexual characteristics and the production of sperm. In females, hormones like estrogen and progesterone regulate the menstrual cycle and support the development of the uterus and breasts.
4. What is the purpose of the menstrual cycle in females?
Ans. The menstrual cycle in females prepares the body for potential pregnancy. It involves the monthly release of an egg from the ovary, thickening of the uterine lining, and shedding of the lining if fertilization does not occur. This cycle typically lasts for about 28 days.
5. What are the common methods of contraception used to prevent pregnancy?
Ans. There are several methods of contraception used to prevent pregnancy, including hormonal methods like birth control pills and patches, barrier methods like condoms and diaphragms, intrauterine devices (IUDs), sterilization procedures, and fertility awareness methods. Each method has its own effectiveness, advantages, and potential side effects.
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