NSO Level 1- Science Olympiad (SOF) Class 12: Questions 11 - 14 of 106

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Question 11

Question

MCQ▾

There is a situation in which sperm fusing with secondary nucleus is obtained from one pollen tube and sperm fusing with egg from another due to discharge of contents of more than one pollen tubes in an embryo sac. What has occurred in this case?

Choices

Choice (4)Response

a.

Heterofertilisation

b.

Polyspermy

c.

Polygamy

d.

All of the above

Question 12

Question

MCQ▾

If there are few or no intermediate forms in fossil record, no morphological change occurred for long periods and new forms arose very fast, then how would be the evolution of these new forms described as?

Choices

Choice (4)Response

a.

Convergent evolution

b.

Gradualism

c.

Punctuated equilibrium

d.

Adaptive evolution

Question 13

Question

MCQ▾

What is radioactively labelled probe in genetic fingerprinting?

Choices

Choice (4)Response

a.

Double stranded RNA molecule

b.

Single stranded RNA molecule

c.

Single stranded DNA molecule

d.

All of the above

Question 14

Question

Match List-Ⅰ List-Ⅱ▾

Match the following and mark the correct choice.

List-Ⅰ (Column I)List-Ⅱ (Column II)
(A)

Freely movable joint

(i)

Vertebrae

(B)

Sternum

(ii)

Pectoral girdle

(C)

Cartilagenous joint

(iii)

Flat bones

(D)

Glenoid Cavity

(iv)

Synovial fluid

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (ii)
  • (iii)
  • (iv)
  • (i)

b.

  • (i)
  • (iv)
  • (iii)
  • (ii)

c.

  • (iv)
  • (iii)
  • (i)
  • (ii)

d.

  • (iii)
  • (ii)
  • (i)
  • (iv)

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