12th Standard CBSE - Biology - Human Reproduction

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Question - 1

In human beings, the eggs are:

  • A Skin lecithal
  • B Macrolecithal
  • C Mesolecithal
  • D Alecithal

Question - 2

Some important events in the human female reproductive cycle are given below.Arrange the events in a proper sequence.A-secretion of FSH, B-growth of corpus luteum, C-growth of the follicle and oogenesis, D-ovulation, E-sudden increase in the levels of LH

  • A A  D  C  E  B
  • B B  A  C  D  E
  • C C  A  D  B  E
  • D A  C  E  D   B

Question - 3

Identify the correctly matched pair/pairs of the germ layers and their derivatives.
A.ectoderm-epidermis                  B. endoderm-dermis
C. mesoderm-muscles                 D. mesoderm-notochord
E. endoderm-enamel of teeth

  • A A and D only
  • B A and B only
  • C A, C  and D only
  • D A, B, C and E only

Question - 4

Ist polar body is formed at which state of oogenesis?

  • A Ist meiosis
  • B 2nd mitosis
  • C Ist mitosis
  • D differentiation

Question - 5

Which layer develops first during embryonic development?

  • A ectoderm
  • B mesoderm
  • C endoderm
  • D both (b) and (c)

Question - 6

Foetal ejection reflex in human female is induced by

  • A differentiation of mammary glands
  • B the pressure exerted by amniotic fluid
  • C the release of oxytocin from pituitary
  • D fully developed foetus and placenta

Question - 7

Which one of the following is the correct matching of the events occurring during menstrual cycle?

  • A Menstruation: breakdown of myometrium and ovum not fertilized
  • B Ovulation:LH and FSH attain peak level and sharp fall the in secretion of progesterone.
  • C Proliferative phase: Rapid regeneration of myometrium and maturation of Graafian follicle
  • D Development of corpus luteum:  Secretary phase and increased secretion of progesterone

Question - 8

Which one of the following is the most likely root cause why menstruation is not taking place in the regularly cycling human female?

  • A retention of well-developed corpus luteum
  • B fertilization of the ovum
  • C maintenance of the hypertrophical endometrial lining
  • D maintenance of high conc. of sex hormones in the blood stream

Question - 9

The correct sequence of spermatogenic stages leading to the formation of sperms in a mature human testis is

  • A spermatogonia-spermatid-spermatocyte-sperms
  • B spermatocyte-spermatogonia-spermatid-sperms
  • C spermatogonia-spermatocyte-spermatid-sperms
  • D spermatid-spermatocyte-spermatogonia-sperms

Question - 10

A change in the amount of yolk and its distribution in the egg will affect

  • A Fertilization
  • B Formation of zygote
  • C Pattern of cleavage
  • D Number of blastomeres produced
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