According to Ficks’ law, which of the following would maximise gas exchange in plants?Large surface area, large concentration gradient, large diffusion distanceLarge surface area, large concentration gradient, small diffusion distanceSmall surface area, large concentration gradient, small diffusion distanceSmall surface area, small concentration gradient, large diffusion distance2Which of the following is not an adaptation of leaves for efficient gas exchange?Thin and flat structurePresence of stomata to allow gases to diffuse in and out of leafRegularly shaped spongy cells provide a small surface area of cell membrane in contact with air spacesGood vascular network of xylem3What is meant by the term ‘deciduous’ tree?Loses leaves seasonallyRetains leaves all year roundLeaves adapted for cold conditionsLeaves adapted for hot, dry conditions4Which of the following is not an adaptation of cacti to prevent water loss?Thick waxy cuticle on leaf surfaceLeaves reduced to spinesStomata only open at nightFlat, normal stomata
Question
According to Ficks’ law, which of the following would maximise gas exchange in plants?Large surface area, large concentration gradient, large diffusion distanceLarge surface area, large concentration gradient, small diffusion distanceSmall surface area, large concentration gradient, small diffusion distanceSmall surface area, small concentration gradient, large diffusion distance2Which of the following is not an adaptation of leaves for efficient gas exchange?Thin and flat structurePresence of stomata to allow gases to diffuse in and out of leafRegularly shaped spongy cells provide a small surface area of cell membrane in contact with air spacesGood vascular network of xylem3What is meant by the term ‘deciduous’ tree?Loses leaves seasonallyRetains leaves all year roundLeaves adapted for cold conditionsLeaves adapted for hot, dry conditions4Which of the following is not an adaptation of cacti to prevent water loss?Thick waxy cuticle on leaf surfaceLeaves reduced to spinesStomata only open at nightFlat, normal stomata
Solution
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According to Fick's law, the rate of diffusion is directly proportional to the surface area and the concentration gradient, and inversely proportional to the diffusion distance. Therefore, to maximize gas exchange in plants, you would need a large surface area, large concentration gradient, and small diffusion distance.
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The adaptation of leaves for efficient gas exchange that is not correct is: Regularly shaped spongy cells provide a small surface area of cell membrane in contact with air spaces. In fact, the spongy cells in leaves are irregularly shaped to increase the surface area for gas exchange.
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The term 'deciduous' tree refers to a tree that loses its leaves seasonally.
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The adaptation of cacti to prevent water loss that is not correct is: Flat, normal stomata. In fact, cacti have sunken stomata to reduce water loss.
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