IGCSE Biology Paper-2: Specimen Questions with Answers 58 - 60 of 203

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Question 58

Question

MCQ▾

Which acids are mainly responsible for acid rain-?

Choices

Choice (4)

a.

Phosphoric acid and carbonic acid

b.

Nitric acid and sulphuric acid

c.

Chloric acid and hypochlorous acid

d.

Hydrochloric acid and chloroform

Answer

b.

Explanation

Acid rain is a global problem, which is a mixture of wet and dry deposition from the atmosphere containing higher amounts of nitric and sulfuric acids. The precursors, of acid rain formation result from both natural sources, such as volcanoes and decaying vegetation, and synthetic sources, primarily emission of sulfur dioxide and nitrogen oxides resulting from fossil fuel combustion.

Question 59

Question

MCQ▾

Following are the pictures of

Figure Shows Some Small Granules

Choices

Choice (4)

a.

Protein molecules

b.

Starch grain

c.

Lipid membrane

d.

None of the above

Answer

b.

Explanation

Starch grains are small granules found in the leaves, roots, stems, fruits and seeds of plants. These grains help as energy reserves for plants.

Question 60

Question

MCQ▾

Normal value of hemoglobin in female is-

Choices

Choice (4)

a.

8.9 - 10.2 (g/dL)

b.

11.7 - 15.7 (g/dL)

c.

4.5 - 6.6 (g/dL)

d.

15.2 - 19.7 (g/dL)

Answer

b.

Explanation

Hemoglobin is a protein in red blood cells that carries oxygen. The hemoglobin test is a blood test that measures how much hemoglobin is present in blood. Normal results for adults vary, but in general are:

Male: 13.8 to 17.2 grams per deciliter (g/dL)

Female-11.7 - 15.7 grams per deciliter (g/dL)

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