IGCSE Biology Paper-2: Specimen Questions with Answers 49 - 51 of 203

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Question 49

Question

MCQ▾

The example of ionic radiation is-

Choices

Choice (4)

a.

X-rays

b.

UV rays

c.

Visible rays

d.

Solar rays

Answer

a.

Explanation

Ionizing radiation is radiation that carries enough energy to free electrons from atoms or molecules, thereby ionizing them and example of such ionic radiation are- X-rays and gamma rays. All other three rays are the example of non-ionizing rays.

Question 50

Question

MCQ▾

The diagram shows carbon cycle . Which part indicates combustion of past living organisms on earth.

Figure Shows Carbon Cycle - Find A

Choices

Choice (4)

a.

Part B

b.

Part A

c.

Part C

d.

Part D

Answer

b.

Explanation

In carbon cycle, plant use sunlight to make their own food and grow. The carbon becomes part of the plant. Plant die and convert into fossils like coal and oil after millions of years. When human burn fossil fuels, most of the carbon quickly enters the atmosphere as carbon dioxide.

Question 51

Question

MCQ▾

Soil erosion will be more in which condition

Choices

Choice (4)

a.

When low rainfal occur

b.

No rain fall

c.

When high rainfall occur

d.

All of the above

Answer

c.

Explanation

Soil erosion is a naturally occuring process in which movement and deposition of soil occur. Erosion can be occur by water, wind or tillage

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