2 Question Acceptable Answer Not Mark acceptable 5 (b) increasing 1 increases both correct = 1 (c) X carbon dioxide (concentration) / Lack of carbon temperature 1 dioxide too high Y temperature / temperature too low both correct = 1 (d) carbon dioxide 2 glucose starch 3 correct = 2 1 / 2 correct = 1 St Gr. Two gardeners compared their tomato crops. Both grew 10 plants of the same 2013 variety in a greenhouse. Q5 (a) One gardener altered the environmental conditions in his greenhouse to increase ii & the rate of photosynthesis. His plants yielded 720 tomatoes. (b) The other gardener only produced 480 tomatoes. (ii) Describe two changes to the environmental conditions in the greenhouse which 1 could have increased the rate of photosynthesis. 1 2 (b) (ii) Name a tissue in the leaves of plants in which photosynthesis takes place. 1
2 Question Acceptable Answer Not acceptable Mark 5 (b) increasing increases both correct = 1 1 (c) X carbon dioxide (concentration) / Lack of carbon dioxide Y temperature / temperature too low both correct = 1 temperature too high 1 (d) carbon dioxide glucose starch 3 correct = 2 1 / 2 correct = 1 2 St Gr. 2013 Q5 (a) ii & (b) Two gardeners compared their tomato crops. Both grew 10 plants of the same variety in a greenhouse. One gardener altered the environmental conditions in his greenhouse to increase the rate of photosynthesis. His plants yielded 720 tomatoes. The other gardener only produced 480 tomatoes. (ii) Describe two changes to the environmental conditions in the greenhouse which could have increased the rate of photosynthesis. 1 2 1 (b) (ii) Name a tissue in the leaves of plants in which photosynthesis takes place. 1
biology-n5-past-paper-questions-cell-biology.docx