IGCSE Biology Paper-2: Specimen Questions with Answers 64 - 66 of 203

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Question 64

Question

MCQ▾

The diagram shows the external features of an animal.

Figure Shows an External Feature of an Organism

To which group does the animal belong?

Choices

Choice (4)

a.

Mollusca

b.

Arthropods

c.

Annelids

d.

Nematodes

Answer

a.

Explanation

Octopuses is a cephalopod Mollusca of order Octopoda. It has two eyes and eight arms. An octopus has a beak or rostrum in the center of arms and it has no internal and external skeleton.

Question 65

Question

MCQ▾

Which gas abundantly occurs in atmosphere?

Choices

Choice (4)

a.

Oxygen

b.

Hydrogen

c.

Nitrogen

d.

Carbon di oxide

Answer

c.

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 66

Question

MCQ▾

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

In Image Indicate an Energy Pyramid of Terrestrial Ecosystem

Choices

Choice (4)

a.

Upright

b.

Intermediate

c.

Inverted

d.

Irregular

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.

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