CIE Biology Paper-4: Specimen Questions 10 - 13 of 120

Question number: 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

Image shows name of greenhouse gases their contribution and main generation source

GHS

%Contribution (estimated)

Main sources

CO2

55%

By burning fossil fuels

CH4

15%

Decay of organic matter

CFCs

24%

Refrigerators and A. c.

Nitrogen oxides

6%

Fertilizers, vehicles

Passage

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

Question number: 11 (1 of 4 Based on Passage) Show Passage

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What are the examples of allosteric enzymes and zymogens?

Explanation

Allosteric enzymes:

  • Glycogen phosphorylase
  • Aspartate transcarbamyolase

Zymogens:

  • Angiotensinogen
  • Trypsinogen
  • Chymotrypsinogen
  • Pepsinogen

Question number: 12 (2 of 4 Based on Passage) Show 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 number: 13 (3 of 4 Based on Passage) Show 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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