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 ion | Function in plants | Effect of lack of mineral ion on plants |
nitrate | ||
magnesium | ||
phosphate | used for making DNA | poor root growth |
Explanation
Mineral ion | Function in plants | Effect of lack of mineral ion on plants |
nitrate | making amino acids and protein | Stunted growth of plant Older leaves turn yellow |
magnesium | Needed to make chlorophyll | Leaves turn yellow |
phosphate | used for making DNA | poor root growth |
Passage
A diagram of a mammalian heart and associated blood vessels is shown in Fig.
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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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.
Statement | name of structure | letter 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 |
Explanation
Statement | name of structure | letter from Fig. |
chamber that creates the highest blood pressure | Left ventricle | F |
blood vessel containing blood with the highest concentration of oxygen | Pulmonary vein | R |
structure that prevents blood going from ventricle to atrium | Bicuspid and tricuspid valve | T |
structure that prevents back flow of blood from artery to ventricle | Bicuspid and tricuspid valve | T |
chamber that receives blood from vena cava | Right atrium | C |