How Do Organisms Reproduce? Part 2: MCQs (Q26–Q50)
📘 How Do Organisms Reproduce? – MCQs (Class 10 Science)
🔹 Part 2: Questions 26–50
Q26. In which of the following organisms does fertilization take place outside the body?
A) Humans
B) Birds
C) Frogs
D) Reptiles
Correct Answer: C) Frogs
Explanation:
- A) Humans → Internal fertilization.
- B) Birds → Internal fertilization.
- ✅ C) Frogs → External fertilization, in water.
- D) Reptiles → Internal fertilization.
Q27. Which of the following statements about asexual reproduction is true?
A) It involves two parents.
B) It results in identical offspring.
C) It produces variations.
D) It requires gametes.
Correct Answer: B) It results in identical offspring.
Explanation:
- A) Two parents → Sexual reproduction.
- ✅ B) Asexual → Produces clones.
- C) Variations → Sexual reproduction.
- D) Gametes → Not required in asexual.
Q28. In human females, ovulation occurs approximately on the:
A) 1st day of menstrual cycle
B) 7th day
C) 14th day
D) 28th day
Correct Answer: C) 14th day
Explanation:
- A) 1st day → Menstrual bleeding starts.
- B) 7th day → Early cycle.
- ✅ C) 14th day → Ovulation occurs.
- D) 28th day → End of cycle.
Q29. Which of the following is an example of artificial vegetative propagation?
A) Spirogyra fragmentation
B) Potato tuber formation
C) Bryophyllum leaf buds
D) Grafting in mango
Correct Answer: D) Grafting in mango
Explanation:
- A, B, C → Natural vegetative propagation.
- ✅ D) Grafting → Artificial method by humans.
Q30. Which of the following is a bisexual flower?
A) Papaya
B) Rose
C) Papaya (male plant)
D) Papaya (female plant)
Correct Answer: B) Rose
Explanation:
- A, C, D → Papaya is unisexual.
- ✅ B) Rose has both stamen and carpel → bisexual.
Q31. What is the function of placenta in humans?
A) Formation of gametes
B) Supply of oxygen and nutrients to embryo
C) Storage of sperms
D) Secretion of hormones only
Correct Answer: B) Supply of oxygen and nutrients to embryo
Explanation:
- A) Gamete formation → Gonads.
- ✅ B) Placenta → Transfers oxygen, nutrients, removes waste.
- C) Not related.
- D) Produces hormones too, but not only function.
Q32. Which of the following is NOT an STD (sexually transmitted disease)?
A) HIV/AIDS
B) Malaria
C) Syphilis
D) Gonorrhea
Correct Answer: B) Malaria
Explanation:
- ✅ B) Malaria → Spread by mosquito bite, not sexual contact.
- A, C, D → STDs.
Q33. Which organ in human males stores sperms temporarily?
A) Urethra
B) Testes
C) Epididymis
D) Vas deferens
Correct Answer: C) Epididymis
Explanation:
- A) Urethra → Passage.
- B) Testes → Sperm production.
- ✅ C) Epididymis → Stores sperms temporarily.
- D) Vas deferens → Transports sperms.
Q34. The fusion of gametes produces a single cell called:
A) Embryo
B) Zygote
C) Ovum
D) Foetus
Correct Answer: B) Zygote
Explanation:
- A) Embryo → Later development stage.
- ✅ B) Zygote → First diploid cell after fertilization.
- C) Ovum → Female gamete.
- D) Foetus → Advanced stage.
Q35. Which part of the flower develops into fruit?
A) Ovary
B) Ovule
C) Petal
D) Sepal
Correct Answer: A) Ovary
Explanation:
- ✅ A) Ovary → Develops into fruit.
- B) Ovule → Becomes seed.
- C & D → Only protective.
Q36. Which of the following is a method of contraception?
A) Condom
B) Oral pills
C) Copper-T
D) All of the above
Correct Answer: D) All of the above
Explanation:
- A) Condom → Barrier method.
- B) Pills → Hormonal.
- C) Copper-T → Device in uterus.
- ✅ D) All are contraceptives.
Q37. Which is a function of seminal vesicles?
A) Spermatogenesis
B) Sperm storage
C) Add fluid to semen
D) Sperm fertilization
Correct Answer: C) Add fluid to semen
Explanation:
- A) Sperm formation → Testes.
- B) Storage → Epididymis.
- ✅ C) Seminal vesicles add nutritive fluid to semen.
- D) Fertilization → In female body.
Q38. The tube that carries egg from ovary to uterus is:
A) Urethra
B) Oviduct (Fallopian tube)
C) Cervix
D) Vagina
Correct Answer: B) Oviduct (Fallopian tube)
Explanation:
- A) Urethra → Urine passage.
- ✅ B) Fallopian tube → Egg transport and fertilization site.
- C) Cervix → Lower opening of uterus.
- D) Vagina → Birth canal.
Q39. Which of the following is a feature of sexual reproduction?
A) Faster than asexual reproduction
B) Produces identical offspring
C) Involves gametes and fertilization
D) Requires only one parent
Correct Answer: C) Involves gametes and fertilization
Explanation:
- A, B, D → Features of asexual reproduction.
- ✅ C) Sexual → Involves gametes and fertilization.
Q40. A contraceptive method that prevents ovulation is:
A) Condom
B) Oral pills
C) Copper-T
D) Vasectomy
Correct Answer: B) Oral pills
Explanation:
- A) Condom → Barrier.
- ✅ B) Pills → Hormones prevent ovulation.
- C) Copper-T → Prevents implantation.
- D) Vasectomy → Blocks sperms.
Q41. Fertilization in flowering plants takes place in:
A) Ovule
B) Ovary
C) Anther
D) Stigma
Correct Answer: A) Ovule
Explanation:
- ✅ A) Fertilization occurs in ovule, later becomes seed.
- B) Ovary → Becomes fruit.
- C, D → Pollen production and landing, not fertilization site.
Q42. Which of the following methods is NOT artificial vegetative propagation?
A) Cutting
B) Grafting
C) Layering
D) Pollination
Correct Answer: D) Pollination
Explanation:
- A, B, C → Artificial vegetative propagation methods.
- ✅ D) Pollination → Natural process, not vegetative.
Q43. The testis is enclosed in a sac called:
A) Scrotum
B) Epididymis
C) Vas deferens
D) Seminal vesicle
Correct Answer: A) Scrotum
Explanation:
- ✅ A) Scrotum → Sac that holds testes outside body.
- B) Epididymis → Storage of sperms.
- C) Vas deferens → Sperm duct.
- D) Seminal vesicle → Secretes fluid.
Q44. Which of the following organisms reproduce by budding?
A) Amoeba and Hydra
B) Hydra and Yeast
C) Planaria and Hydra
D) Spirogyra and Hydra
Correct Answer: B) Hydra and Yeast
Explanation:
- A) Amoeba → Fission.
- ✅ B) Both Hydra and Yeast → Budding.
- C, D → Wrong pairs.
Q45. Which of the following is NOT a function of female reproductive system?
A) Production of eggs
B) Development of embryo
C) Production of sperms
D) Fertilization
Correct Answer: C) Production of sperms
Explanation:
- A, B, D → Functions of female reproductive system.
- ✅ C) Sperms → Produced in males only.
Q46. Which hormone controls ovulation in females?
A) Insulin
B) LH (Luteinizing hormone)
C) Testosterone
D) FSH (Follicle stimulating hormone)
Correct Answer: B) LH (Luteinizing hormone)
Explanation:
- A) Insulin → Blood sugar.
- ✅ B) LH → Stimulates ovulation in females.
- C) Testosterone → Male hormone.
- D) FSH → Stimulates follicle growth, not ovulation directly.
Q47. Which type of reproduction occurs in spirogyra?
A) Budding
B) Fragmentation
C) Regeneration
D) Sporulation
Correct Answer: B) Fragmentation
Explanation:
- A) Budding → Yeast, Hydra.
- ✅ B) Fragmentation → Spirogyra filaments break and regrow.
- C, D → Not applicable.
Q48. Which of the following is a surgical contraceptive method in males?
A) Tubectomy
B) Copper-T
C) Condom
D) Vasectomy
Correct Answer: D) Vasectomy
Explanation:
- A) Tubectomy → Females.
- B) Copper-T → Intrauterine device.
- C) Condom → Barrier method.
- ✅ D) Vasectomy → Surgical cutting of vas deferens in males.
Q49. The term “foetus” is used for the developing baby after:
A) Fertilization
B) Zygote stage
C) Embryo stage (after 8 weeks)
D) Birth
Correct Answer: C) Embryo stage (after 8 weeks)
Explanation:
- A, B → Early stages.
- ✅ C) After 8 weeks of development → Called foetus.
- D) Birth → Infant.
Q50. In humans, the chromosome number in gametes is:
A) 23
B) 46
C) 92
D) 44
Correct Answer: A) 23
Explanation:
- ✅ A) Gametes are haploid (23 chromosomes).
- B) Body cells → 46 (diploid).
- C, D → Incorrect.
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