B1 3 transport in cells higher

Clevedon School

Science Department

Biology B1,3 – Transport in Cells Higher

Write all answers on lined paper.

Do not write in this booklet

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3 Keith and Sarah carried out an investigation into the effects of osmosis on plant tissues, placing three sets of beetroot cylinders in 3 different sugar solutions for 30 minutes. One set had gained mass, another lost mass and the third set did not change. Keith student thought the last experiment hadn’t worked. Sarah disagreed. Who was right? Explain all three results in terms of osmosis. [6] ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………

4 Male moths can track down a mate from up to 3 miles away because they can detect the special chemicals produced by the female moths. Explain, in terms of diffusion, how the scent particles move. [3]

Male moth

Female moth

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5 Explain why diffusion takes place faster when there is an increase in temperature. [2] ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………

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Many cells have folded membranes along at least one surface. Explain why. [2] ………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………

7 Describe 1 way in which active transport is different to diffusion and osmosis. [1] ………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………

8 Cells that carry out a lot of active transport also usually have many mitochondria. Explain why. [1] ………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………