Vidaara.orgClass 12 · Mathematics
CodeVID-M12-WS
Human Reproduction — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
The male gamete in humans is the:
- A.Egg
- B.Sperm
- C.Zygote
- D.Embryo
2.
Sperm are produced in the:
- A.Ovaries
- B.Testes
- C.Uterus
- D.Vagina
3.
The testes lie outside the body in the scrotum because sperm formation needs:
- A.A higher temperature
- B.A slightly cooler temperature
- C.No oxygen
- D.More light
4.
Eggs and female hormones are produced by the:
- A.Uterus
- B.Ovaries
- C.Oviducts
- D.Vagina
5.
The organ in which the baby develops is the:
- A.Ovary
- B.Uterus
- C.Oviduct
- D.Cervix
6.
Formation of gametes is called:
- A.Gametogenesis
- B.Fertilisation
- C.Ovulation
- D.Implantation
7.
The making of sperm is called:
- A.Oogenesis
- B.Spermatogenesis
- C.Ovulation
- D.Lactation
8.
Gametes are haploid because gametogenesis involves:
- A.Mitosis
- B.Meiosis
- C.Budding
- D.Fission
9.
Release of a mature egg from the ovary is called:
- A.Menstruation
- B.Ovulation
- C.Implantation
- D.Fertilisation
10.
A typical menstrual cycle lasts about:
- A.7 days
- B.14 days
- C.28 days
- D.90 days
11.
Fusion of a sperm and egg is called:
- A.Ovulation
- B.Fertilisation
- C.Implantation
- D.Parturition
12.
Fertilisation usually occurs in the:
- A.Uterus
- B.Oviduct
- C.Vagina
- D.Ovary
13.
Embedding of the early embryo in the uterine lining is:
- A.Ovulation
- B.Implantation
- C.Lactation
- D.Menstruation
14.
The structure that supplies the baby with oxygen and nutrients is the:
- A.Placenta
- B.Ovary
- C.Cervix
- D.Bladder
15.
Human gestation (pregnancy) lasts about:
- A.3 months
- B.6 months
- C.9 months
- D.12 months
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
A sperm's middle piece is packed with mitochondria because it must:
- A.Provide energy for the tail to swim
- B.Carry the genes
- C.Digest the egg
- D.Store food for the baby
17.
If fertilisation does NOT occur in a cycle, the thickened uterine lining is:
- A.Shed as the menstrual flow
- B.Kept permanently
- C.Turned into an egg
- D.Absorbed by the ovary
18.
The zygote is diploid even though the gametes are haploid because fertilisation:
- A.Combines the chromosomes of both gametes
- B.Halves the chromosomes
- C.Removes chromosomes
- D.Copies one gamete only
19.
The placenta is described as the baby's lifeline because it carries out exchange of:
- A.Nutrients, oxygen and wastes between mother and baby
- B.Only bones
- C.Only sperm
- D.Nothing
20.
Colostrum, the first breast milk, is especially valuable to a newborn because it is rich in:
- A.Antibodies that protect against infection
- B.Sugar only
- C.Bones
- D.Sperm
21.
Only one sperm normally fertilises an egg; mechanisms blocking extra sperm prevent the zygote from becoming:
- A.Abnormal with too many chromosomes
- B.Too small
- C.Haploid
- D.An egg
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Sperm
- (B) Testes
- (B) A slightly cooler temperature
- (B) Ovaries
- (B) Uterus
- (A) Gametogenesis
- (B) Spermatogenesis
- (B) Meiosis
- (B) Ovulation
- (C) 28 days
- (B) Fertilisation
- (B) Oviduct
- (B) Implantation
- (A) Placenta
- (C) 9 months
Section B — Challenge / Olympiad (2 marks each)
- (A) Provide energy for the tail to swim
- (A) Shed as the menstrual flow
- (A) Combines the chromosomes of both gametes
- (A) Nutrients, oxygen and wastes between mother and baby
- (A) Antibodies that protect against infection
- (A) Abnormal with too many chromosomes
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