10th Standard CBSE - Science - Heredity and Evolution

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Question - 1

A mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as

  • A TTWW
  • B TTww
  • C TtWW
  • D TtWw

Question - 2

An example of homologous organs is

  • A Our arm and a dog's fore-leg
  • B Our teeth and an elephant's tusks.
  • C Potato and runners of grass.
  • D all of the above

Question - 3

In evolutionary terms, we have more in common with

  • A A Chinese school-boy.
  • B A chimpanzee
  • C A spider
  • D A bacterium

Question - 4

Exchange of genetic material takes place in 

  • A vegetative reproduction
  • B asexual reproduction
  • C sexual reproduction
  • D budding

Question - 5

Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be

  • A double fertilisation
  • B self pollination
  • C cross fertilisation
  • D no fertilisation

Question - 6

A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because

  • A tallness is the dominant trait
  • B shortness is the dominant trait
  • C tallness is the recessive trait
  • D height of pea plant is not governed by gene 'T' or 't'

Question - 7

Which of the following statement is incorrect?

  • A For every hormone there is a gene 
  • B For every protein there is a gene
  • C For production of every enzyme there is a gene.
  • D For every molecule of fat there is a gene.

Question - 8

If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in FI generation are

  • A round and yellow 
  • B round and green
  • C wrinkled and green
  • D wrinkled and yellow

Question - 9

In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are.
(i) large chromosome
(ii) small chromosome
(iii) Y - chromosome
(iv) X - chromosome

  • A (i) and (ii)
  • B (iii) only
  • C (iii) and (iv)
  • D (ii) and (iv)

Question - 10

The maleness of a child is determined by

  • A the X chromosome in the zygote
  • B the Y chromosome in zygote
  • C the cytoplasm of germ cell which determines the sex.
  • D sex is determined by chance
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