NSO Level 1- Science Olympiad (SOF) Class 12: Questions 52 - 55 of 106

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Question 52

Question

True-False▾

Statements

  1. A/T = C/G

  2. There are two phosphate groups, two bases and two deoxyribose sugar molecules.

  3. A + T = G + C

  4. After separation two strands of a double helix are identical.

  5. In aqueous cytoplasm stability to the double helical DNA is provided by hydrogen bonding.

  6. In aqueous cytoplasm stability to the double helical DNA is provided by hydrophobic bonding.

Choices

Choice (4)Response

a.

Statement Ⅱ, Ⅲ, Ⅳ & Ⅴ are all true. & Ⅵ are all true.

b.

Statement Ⅰ, Ⅲ & Ⅴ are all true.

c.

Statement Ⅰ, Ⅱ, Ⅴ & Ⅵ are all true.

d.

All the statements are correct.

Question 53

Question

MCQ▾

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 54

Question

Assertion-Reason▾

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 55

Question

MCQ▾

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.

b.

c.

d.

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