NSO Level 1- Science Olympiad (SOF) Class 12: Questions 45 - 47 of 60

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Question number: 45

» Biology » Reproduction

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Question

CuT is an intrauterine contraceptive device. What is the role of Cu from the statements given below?

Choices

Choice (4) Response

a.

Cu ions are responsible for making cervix hostile to sperms

b.

Motility of sperms and their fertilizing capacity is suppressed by Cu ions

c.

Uterus is made unsuitable for implantation by Cu ions

d.

All of the above

Question number: 46

» Biology » Reproduction

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Question

There is a reduction in anterior pituitary function in a man which causes decrease in sperm production and low testosterone levels. He is given testosterone only. Will the sperm production start being normal?

Choices

Choice (4) Response

a.

No because administered testosterone will not work in normal environment of body.

b.

No because FSH from Sertoli cells is required for stimulation of spermatogenesis.

c.

Yes it will act locally on Leydig’s cells.

d.

Yes there will be positive feedback sent by testosterone for LH production.

Question number: 47

» Biology » Ecology

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MCQ▾

Question

Scientist observed population interaction pattern between two plant species and they concluded that:

  1. B species is benefited from species A but, species A is harmed.

  2. There is temporary or permanent contact between species A and B.

  3. Species B show higher productivity when they are alone compared to when grown near species A.

Which type of population interaction is it?

Choices

Choice (4) Response

a.

Commensalism

b.

Parasitism

c.

Mutualism

d.

Amensalism

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