IGCSE Biology Paper-4: Specimen Questions with Answers 9 - 12 of 279

Question 9

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Draw the inheritance of sex in human beings by XX chromosomes and XY chromosomes.

Explanation

Image Shows the Inheritance of Sex in Human Being

Question 10

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Name the Greenhouse gases their estimated contribution and main source of production

Explanation

In greenhouse effect, the earth absorbs short wave radiations from sun light passes by the atmosphere and reaches to the earth . Some of radiations re emitted as long wavelength radiations, which cannot pass through the blanket of greenhouse gases in the atmosphere, which is called as greenhouse effect. Greenhouse gases are carbon di oxide, methane, CFCs and Nitrogen oxides.

Image Shows Name of Greenhouse Gases
GHS% Contribution (estimated)Main sources
CO255 %By burning fossil fuels
CH415 %Decay of organic matter
CFCs24 %Refrigerators and A. c.
Nitrogen oxides6 %Fertilizers, vehicles

Passage

Enzymes are large biomolecules that are responsible for many chemical reactions that are necessary to sustain life.

Question 11 (1 of 4 Based on Passage)

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In which condition of pH, enzymes can act better?

Explanation

Many enzymes act better in pH of six and eight.

Question 12 (2 of 4 Based on Passage)

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Would enzyme activity be affected by pH?

Explanation

Yes. pH is one of the main factor for denaturation of protein so if enzyme is subjected to pH level under which it is denatured , there will be no enzyme activity.

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