📘 How Do Organisms Reproduce? – MCQs (Class 10 Science)

🔹 Part 4: Questions 76–100

Q76. The number of chromosomes in human gametes is:

A) 23
B) 46
C) 92
D) 44

Correct Answer: A) 23

Explanation:

• ✅ A) Gametes are haploid (23 chromosomes).
• B) 46 → In body cells (diploid).
• C, D → Incorrect.

Q77. Which of the following organisms reproduces through regeneration?

A) Amoeba
B) Hydra
C) Planaria
D) Yeast

Correct Answer: C) Planaria

Explanation:

• A) Amoeba → Binary fission.
• B) Hydra → Budding.
• ✅ C) Planaria → Can regenerate body parts.
• D) Yeast → Budding.

Q78. Which is an example of internal fertilization?

A) Frog
B) Fish
C) Human
D) Hydra

Correct Answer: C) Human

Explanation:

• A) Frog → External fertilization.
• B) Fish → External fertilization.
• ✅ C) Humans → Fertilization inside female body.
• D) Hydra → Asexual budding.

Q79. Which of the following is NOT a part of the male reproductive system?

A) Testes
B) Vas deferens
C) Ovary
D) Prostate gland

Correct Answer: C) Ovary

Explanation:

• A, B, D → Male reproductive organs.
• ✅ C) Ovary → Female organ.

Q80. The use of condoms helps prevent:

A) Only pregnancy
B) Only STDs
C) Both pregnancy and STDs
D) None

Correct Answer: C) Both pregnancy and STDs

Explanation:

• A, B → Incomplete.
• ✅ C) Condoms prevent pregnancy and protect against infections like HIV.
• D → Wrong.

Q81. In Rhizopus (bread mould), reproduction takes place by:

A) Budding
B) Binary fission
C) Spore formation
D) Fragmentation

Correct Answer: C) Spore formation

Explanation:

• A) Budding → Yeast.
• B) Binary fission → Amoeba.
• ✅ C) Rhizopus → Produces spores.
• D) Fragmentation → Spirogyra.

Q82. Which of the following is a natural method of vegetative propagation?

A) Cutting in rose
B) Grafting in mango
C) Layering in jasmine
D) Potato tuber

Correct Answer: D) Potato tuber

Explanation:

• A, B, C → Artificial methods.
• ✅ D) Potato tuber (eyes) → Natural vegetative propagation.

Q83. Which of the following hormones controls the menstrual cycle?

A) Insulin and adrenaline
B) Estrogen and progesterone
C) Thyroxine and prolactin
D) Testosterone and cortisol

Correct Answer: B) Estrogen and progesterone

Explanation:

• ✅ B) Female hormones regulate menstrual cycle.
• Others → Not directly involved.

Q84. The term “menarche” refers to:

A) First ovulation
B) First menstrual cycle
C) Last menstrual cycle
D) Pregnancy

Correct Answer: B) First menstrual cycle

Explanation:

• ✅ B) Menarche = Beginning of menstruation.
• C) Last menstrual cycle → Menopause.
• A, D → Not related.

Q85. The tube that carries sperms from testes to urethra is:

A) Epididymis
B) Vas deferens
C) Prostate gland
D) Ureter

Correct Answer: B) Vas deferens

Explanation:

• A) Epididymis → Stores sperms.
• ✅ B) Vas deferens → Duct carrying sperms to urethra.
• C, D → Wrong organs.

Q86. Which of the following STD is caused by a virus?

A) Syphilis
B) Gonorrhea
C) AIDS
D) Trichomoniasis

Correct Answer: C) AIDS

Explanation:

• A, B, D → Caused by bacteria/protozoa.
• ✅ C) AIDS → Caused by HIV virus.

Q87. Which of the following is NOT an advantage of vegetative propagation?

A) Plants bear flowers earlier
B) Plants are genetically identical
C) Variation occurs in offspring
D) It is useful for seedless plants

Correct Answer: C) Variation occurs in offspring

Explanation:

• ✅ C) Vegetative propagation → Produces clones, no variation.
• A, B, D → Advantages.

Q88. What is the significance of sexual reproduction?

A) Faster reproduction
B) No gamete formation required
C) Produces variation in offspring
D) Offspring identical to parents

Correct Answer: C) Produces variation in offspring

Explanation:

• A, B, D → False for sexual reproduction.
• ✅ C) Variation → Evolutionary advantage.

Q89. Which of the following is a permanent contraceptive method in males?

A) Condom
B) Vasectomy
C) Copper-T
D) Oral pills

Correct Answer: B) Vasectomy

Explanation:

• ✅ B) Vasectomy → Surgical cutting of vas deferens.
• A, C, D → Temporary methods.

Q90. Which of the following organisms shows both sexual and asexual reproduction?

A) Hydra
B) Amoeba
C) Human
D) Papaya

Correct Answer: A) Hydra

Explanation:

• ✅ A) Hydra → Budding (asexual) + sexual reproduction.
• B, C, D → Only one mode.

Q91. Which of the following terms is associated with viviparous animals?

A) Egg-laying
B) Young ones born alive
C) No reproduction
D) Only asexual reproduction

Correct Answer: B) Young ones born alive

Explanation:

• ✅ B) Viviparous → Give birth to young ones (humans).
• A → Oviparous.
• C, D → Wrong.

Q92. The term “menopause” refers to:

A) First menstruation
B) Temporary stoppage of menstruation
C) Permanent stoppage of menstruation
D) Pregnancy

Correct Answer: C) Permanent stoppage of menstruation

Explanation:

• ✅ C) Menopause → End of menstrual cycle in women.
• A → Menarche.
• B → Not correct.
• D → Not related.

Q93. Which part of the human female reproductive system receives the ovum after ovulation?

A) Uterus
B) Fallopian tube
C) Cervix
D) Vagina

Correct Answer: B) Fallopian tube

Explanation:

• ✅ B) Fallopian tube → Catches ovum, site of fertilization.
• Others → Not correct.

Q94. In which of the following organisms does fertilization take place in water?

A) Human
B) Hen
C) Frog
D) Dog

Correct Answer: C) Frog

Explanation:

• ✅ C) Frog → External fertilization in water.
• Others → Internal fertilization.

Q95. Which of the following is an example of oviparous animal?

A) Human
B) Dog
C) Hen
D) Cat

Correct Answer: C) Hen

Explanation:

• ✅ C) Hen → Egg-laying (oviparous).
• A, B, D → Viviparous.

Q96. Which of the following is not an artificial method of vegetative propagation?

A) Cutting
B) Grafting
C) Budding in yeast
D) Layering

Correct Answer: C) Budding in yeast

Explanation:

• A, B, D → Artificial propagation methods.
• ✅ C) Yeast budding → Natural process.

Q97. Which part of the female reproductive system is also called the birth canal?

A) Ovary
B) Uterus
C) Cervix
D) Vagina

Correct Answer: D) Vagina

Explanation:

• ✅ D) Vagina → Passage for childbirth.
• A, B, C → Not the birth canal.

Q98. Which part of a flower forms pollen grains?

A) Ovary
B) Anther
C) Stigma
D) Style

Correct Answer: B) Anther

Explanation:

• ✅ B) Anther → Male reproductive part producing pollen.
• A, C, D → Female parts.

Q99. Which of the following is a surgical contraceptive method in females?

A) Vasectomy
B) Tubectomy
C) Condom
D) Copper-T

Correct Answer: B) Tubectomy

Explanation:

• ✅ B) Tubectomy → Fallopian tubes cut/blocked.
• A → For males.
• C, D → Temporary methods.

Q100. Which of the following is a major disadvantage of asexual reproduction?

A) Produces large number of offspring
B) Offspring identical to parents, no variation
C) Faster method of reproduction
D) Requires only one parent

Correct Answer: B) Offspring identical to parents, no variation

Explanation:

• ✅ B) Asexual → No variation, less adaptability.
• A, C, D → Advantages, not disadvantages.

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