IGCSE Biology Paper-4: Specimen Questions with Answers 194 - 196 of 279

Question 194

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Mineral ions are needed for plant growth.

Complete Table to show the function and effect of the lack of some mineral ions on plants.

Mineral Ions Are Needed for Plant Growth
Mineral ionFunction in plantsEffect of lack of mineral ion on plants
nitrate
magnesium
phosphateused for making DNApoor root growth
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Explanation

Mineral Ions Are Needed for Plant Growth
Mineral ionFunction in plantsEffect of lack of mineral ion on plants
nitratemaking amino acids and proteinStunted growth of plant

Older leaves turn yellow

magnesiumNeeded to make chlorophyllLeaves turn yellow
phosphateused for making DNApoor root growth
Mineral Elements

Passage

A diagram of a mammalian heart and associated blood vessels is shown in Fig.

Structure of Heart

Question 195 (1 of 2 Based on Passage)

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Arrange the alphabets from Fig. to show the pathway taken by deoxygenated blood and oxygenated blood from the heart towards the lungs.

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Explanation

Question 196 (2 of 2 Based on Passage)

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Table contains statements about the structures visible in Fig.

Complete Table by:

  • stating the name of each structure
  • identifying the structure with the corresponding letter from Fig.
Table Contains Statements About the Structures Visible
Statementname of structureletter from F
chamber that creates the highest blood pressure
blood vessel containing blood with the highest concentration of oxygen
structure that prevents blood going from ventricle to atrium
structure that prevents back flow of blood from artery to ventricle
chamber that receives blood from vena cava
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Explanation

Table Contains Statements About the Structures Visible
Statementname of structureletter from Fig.
chamber that creates the highest blood pressureLeft ventricleF
blood vessel containing blood with the highest concentration of oxygenPulmonary veinR
structure that prevents blood going from ventricle to atriumBicuspid and tricuspid valveT
structure that prevents back flow of blood from artery to ventricleBicuspid and tricuspid valveT
chamber that receives blood from vena cavaRight atriumC