ANSWERS 1 (68 Marks)
Deduce the effect of doubling the CO2 concentration to 740 ppm on the growth of wheat plants. (2) the rate of photosynthesis will increase (over the rate at 370 ppm); the photosynthetic rate will at least double (but less than 5–6 times); not linear; bigger plants / more growth / more grain / greater yield; ................
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