Biology Class 12 NCERT Solutions: Chapter 3 Human Reproduction Part 1 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Q. 1 Fill in the blanks:

(a) Humans reproduce ________. (asexually/sexually)

Answer: Humans reproduce sexually.

(b) Humans are________. (oviparous/viviparous/ovoviviparous)

Answer: Humans are viviparous.

Viviparous

(c) Fertilization is ________ in humans. (external/internal)

Answer: Fertilization is internal in human.

(d) Male and female gametes are ________. (diploid/haploid)

Answer: Male and female gametes are haploid

(e) Zygote is ________. (diploid/haploid)

Answer: Zygote is diploid.

(f) The process of release of the ovum from a mature follicle is called________.

Answer: The process of release of the ovum from a mature follicle is called ovulation.

(g) Ovulation is induced by a hormone called the ________.

Answer: Ovulation is induced by a hormone called the luteinizing hormone.

(h) The fusion of the male and the female gametes is called ________.

Answer: The fusion of the male and the female gametes is called fertilization

(i) Fertilization takes place in the ________.

Answer: Fertilization takes place in the fallopian tube

(j) The zygote divides to form ________, which is implanted in uterus.

Answer: The zygote divides to form blastocyst, which is fertilization implanted in uterus.

(k) The structure which provides vascular connection between the fetus and uterus is called ________.

Answer: The structure which provides vascular connection between the fetus and uterus is called placenta.

Q. 2 Draw a labeled diagram of male reproductive system.

Answer:

Male Reproductive System