NSO Level 1- Science Olympiad (SOF) Class 12: Questions 53 - 57 of 60

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Question number: 53

» Biology » Ecology

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MCQ▾

Question

Which of the following microelement’s deficiency is responsible for causing “die back of shoots” in plants?

Choices

Choice (4) Response

a.

Sodium

b.

Molybdenum

c.

Copper

d.

Iron

Question number: 54

» Biology » Biology in Human Welfare

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Histamine is involved in allergic and inflammatory reactions.

Reason (Ꭱ)

Histamine is a vasodilator.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 55

» Biology » Genetics and Evolution

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MCQ▾

Question

In garden peas, height is determined by a single gene with tall being dominate to short. If two heterozygous plants are crossed, what proportion of the tall progeny will be homozygous dominant?

Choices

Choice (4) Response

a.

2/3

b.

1/4

c.

1/3

d.

1/2

Question number: 56

» Biology » Biology in Human Welfare

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MCQ▾

Question

Role of different immune system components are given below which one of the following does not match with its corresponding role?

Choices

Choice (4) Response

a.

IgA – In early days of lactation protects infant from diseases

b.

Interferons – protect non – infected cells from further viral infection

c.

B lymphocytes – produce antibodies against pathogens in blood to fight them

d.

Macrophages – Trap microbes entering the body

Question number: 57

» Biology » Genetics and Evolution

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MCQ▾

Question

Select one correct match from those given below.

Choices

Choice (4) Response

a.

Table of the genetic disorder affected and effects

Table of the genetic disorder affected and effects

Genetic disorder

Affected chromosome

Effects

Down’s syndrome

22

Sterile female

b.

Table of the genetic disorder affected and effects

Table of the genetic disorder affected and effects

Genetic disorder

Affected chromosome

Effects

Turner’s syndrome

23

Super female

c.

Table of the genetic disorder affected and effects

Table of the genetic disorder affected and effects

Genetic disorder

Affected chromosome

Effects

Sickle cell anaemia

7

Sickle-shaped WBC

d.

Table of the genetic disorder affected and effects

Table of the genetic disorder affected and effects

Genetic disorder

Affected chromosome

Effects

Phenylketonuria

12

Mental Retardation

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