IGCSE Biology Paper-1: Specimen Questions with Answers 175 - 176 of 208

Question 175

Edit

Question

MCQ▾

The diagram shows the human heart.

Chambers of Heart

Chambers of Heart

Loading image

P, Q, R and S are the chambers of heart. Which of the following chambers will receive oxygenated blood?

Choices

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

Answer

c.

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.

Normal Heart

Normal Heart

Loading image

Question 176

Edit

Question

MCQ▾

Deforestation has occurred in

Choices

Choice (4)
a.Temperate region
b.Sub-temperate region
c.Tropical region
d.Both a. and b. are correct

Answer

d.

Explanation

The most concentrated deforestation occurs in tropical rainforests. About 31 % of Earth’s land surface is covered by forests. The primary cause of deforestation is agriculture. Trees are cut down for use as building material or sold as fuel (sometimes in the form of charcoal or timber), while cleared land is used as pasture for livestock and plantation. Most agricultural activity resulting in deforestation is subsidized by government tax revenue. Disregard of ascribed value, lax forest management, and deficient environmental laws are some of the factors that lead to large-scale deforestation.