IGCSE Biology Paper-1: Specimen Questions with Answers 173 - 174 of 208

Question 173

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Question

MCQ▾

The diagram shows a double circulatory system.

Oxygenated Blood

Oxygenated Blood

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Which vessels carry oxygenated blood?

Choices

Choice (4)
a.S and Q
b.Q and R
c.P and Q
d.P and R

Answer

d.

Explanation

The heart consists of four chambers in which blood flows. Blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated. The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle. The left ventricle pumps the blood to the aorta which will distribute the oxygenated blood to all parts of the body.

Capillaries of the Lungs

Capillaries of the Lungs

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Question 174

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Question

MCQ▾

The diagram shows the flow of energy in a food chain.

Which organism is Primary consumer?

Structure Shows Sunlight

Structure Shows Sunlight

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Choices

Choice (4)
a.D
b.A
c.B
d.C

Answer

c.

Explanation

Consumers (Heterotrophs)

  • They are unable to synthesize their own food directly or indirectly.
  • They depend upon producers for obtaining nourishment.
  • Consumers can be differentiated into following categories.

Primary Consumers/Herbivores

  • They obtain their nutrition from producers. Ex: Cow, Goat, Sheep, Horse, Deer, Rat, Rabbit, Grasshopper, Buffalo, Zebra, Elephant, Zooplanktons.
  • They are also known as key industry animals because they convert plant material into animal material.