B3 Exchanges Revise for test on 19th November 2013 0.0 / 5 ? BiologyExchange of materialsGCSEAQA Created by: Faridah SalamiCreated on: 18-11-13 20:41 The plant roots could NOT have absorbed these minerals by diffusion. Explain Why They are absorbed from the soil by active transport because there is a lower concentration outside the root cells, than in them. 1 of 12 A plant root has thousands of root hairs The root hais help plant roots absorb minerals because of their larger surface area 2 of 12 A root hair cell contains many mitochondria mitochondria help aerobic respiration to take place and release energy. 3 of 12 What is transpiration? Water loss as vapor by evapouration 4 of 12 Through which part of a leaf, does most transpiration occur? The Stomata 5 of 12 Give three features of the alveoli that allow large amounts of oxygen to enter the blood. 1: They have a large surface area 2: Sac walls are thin to reduce diffusion 3: Cell membrane lining is moist to dissolve gases 6 of 12 Name the process by which oxygen passes from the air into the blood Diffusion 7 of 12 Describe and explain how the villi are adapted to maximize the rate of absorption of the products of digestion. Many micro-villi give a large surface area, many capillaries give good blood supply and maintain concentration gradient 8 of 12 Describe and explain how the villi are adapted to maximize the rate of absorption of the products of digestion. The thin walls leave a short distance for the food to travel 9 of 12 Describe and explain how the villi are adapted to maximize the rate of absorption of the products of digestion. The many mitochondria provide energy for active transport. 10 of 12 Which leaf A, B or C lost most water? C 11 of 12 Name cell x Guard Cell 12 of 12
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