Biology Class 12 NCERT Solutions: Chapter 3 Human Reproduction Part 1

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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.

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: