GCSE biology unit 3 quiz (B3.1) A biology unit 3 quiz that covers B3.1 3.5 / 5 based on 9 ratings ? BiologyGCSEAll boards Created by: Ihsan AbdullahCreated on: 24-04-11 13:53 Active transport is..... The movement of substances against the concentration gradient 1 of 12 Is this energy produced from cellular respiration? True 2 of 12 What about osmosis and diffusion then? Osmosis: movement of water along the concentration gradient. Diffusion: movement of substances along the concentration gradient 3 of 12 The alveoli are a site of gas exchange because.... They are moist, have a rich blood supply and have a large SA : Volume ratio? 4 of 12 The rich blood supply of the alveoli maintains what? the concentration gradient in both directions (along and against) 5 of 12 Absorption in the gut is a combination of... Active transport and diffusion? 6 of 12 The Villi are adapted for exchange as they have.... A large SA, rich blood supply and thin walls 7 of 12 In fish, a large SA is needed for exchange of gases. Which other features do fish have that allow gas exchange to happen? the gills being stacked, separated by water and having a rich blood supply 8 of 12 Being terrestrial (guard against water), insects don't lose much water. Which other factor prevents water loss in an insect? they have a waterproof cuticle outside their shell 9 of 12 What controls the actions of the stomata? guard cells 10 of 12 What is the transpiration stream? the movement of water molecules through the xylem from the roots to the leaves 11 of 12 How do plants regulate water loss? Waxy cuticle, stomata on the bottom of leaves, wilting 12 of 12
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