CIE Biology Paper-2: Specimen Questions 65 - 67 of 103

Question number: 65

MCQ▾

Question

Which gas abundantly occurs in atmosphere?

Choices

Choice (4) Response
a.

Nitrogen

b.

Hydrogen

c.

Carbon di oxide

d.

Oxygen

Answer

a.

Explanation

Nitrogen forms about 78 % of earth atmosphere, which is the most abundant uncombined element. Some compounds like ammonia, nitric acid, organic nitrates (propellants and explosives), and cyanides, contain nitrogen.

Question number: 66

MCQ▾

Question

Given diagram shows a terrestrial ecosystem. In such figure the pyramid of energy will be-

In image indicate an energy pyramid of terrestrial ecosystem

In image indicate an energy pyramid of terrestrial ecosystem

Above image shows a terrestrial ecosystem which represent by a pyramid

Choices

Choice (4) Response
a.

Upright

b.

Intermediate

c.

Irregular

d.

Inverted

Answer

a.

Explanation

Pyramid of energy is always upright. In every ecosystem, the energy flows from the producer to the consumer. At each trophic level, substantial portion of energy is lost. Therefore, the amount of energy decreases from the producer level to the consumer level.

Question number: 67

MCQ▾

Question

Protein’s 3-D structure can be determined by-

Choices

Choice (4) Response
a.

Spectroscopy

b.

Nuclear magnetic resonance

c.

Chromatography

d. Question does not provide sufficient data or is vague

Answer

b.

Explanation

Nuclear magnetic resonance spectroscopy of proteins also called as protein NMR is a field of structural biology in which NMR spectroscopy is used to obtain data about the structure and dynamics of proteins, and nucleic acids, and their complexes

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