CONTROL TEST 2

SECTION B
Question 2
2.1
√ Heading in capitals containing both variables.
√ X-axis correct label and unit.
√ Y-axis correct label and unit.
√ Correct plotting of data lines.
√ Legend (key) correct or label each line.
2.2 At a light intensity of 5 (arbitrary units). √ (1)
2.3 At a light intensity of 1 (arbitrary units). √ (1)
2.4 The optimal level for photosynthesis had been reached. √
Further increases in light intensity no longer increase the rate of
photosynthesis. √ (2)
2.5 It results in an increase in rate of photosynthesis√ and therefore
increases the rate and quantity of carbohydrates (food) made. √
(2)
2.6 By growing plants in the correct CO2 concentration, optimal
photosynthesis levels will result in the best crop yields. √
Thus, an artificial environment (greenhouse) with greater CO2
concentrations will results in greater crop yields. √ (2)
2.7 independent: light intensity√
dependent: rate of carbohydrate production. √ (2)
[15]
3.1.1 A = palisade B = chloroplast C = cuticle
D = mesophyl E = stoma (5)
(5)