NSO Level 1- Science Olympiad (SOF) Class 12: Questions 9 - 12 of 60

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Question number: 9

» Biology » Biology in Human Welfare

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MCQ▾

Question

A person meet with an accident wherein due to the injury the chordae tendinae of the tricuspid valve of the human heart gets partially non-functional then what will be the sudden effect?

Choices

Choice (4) Response

a.

Blood flow in pulmonary artery will be decreased

b.

Pacemaker will stop working

c.

Blood flow in aorta will be slowed down

d.

Blood will flow back to left atrium

Question number: 10

» Biology » Genetics and Evolution

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Assertion-Reason▾

Question

Assertion (Ꭺ)

In eukaryotic cells, RNA which is produced during transcription cannot be directly used for translation.

Reason (Ꭱ)

Phenomenon of RNA splicing helps to remove exons.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Question number: 11

» Biology » Reproduction

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MCQ▾

Question

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 number: 12

» Biology » Genetics and Evolution

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MCQ▾

Question

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

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