Design controlled investigations of light, temperature or carbon dioxide and predict their effects on photosynthetic rate.
Tę umiejętność sprawdza 10 zadań wzorowanych na arkuszach IB z lat 2022–2025.
Temperature is held at 24 °C. At X on the lower curve, increasing which factor would allow a higher photosynthetic rate, as demonstrated by the other curve? A. Oxygen concentration B. Chloroplast number C. Carbon dioxide concentration D. Darkness duration
A blue carbon-dioxide indicator becomes yellow when dissolved carbon dioxide accumulates. Identical sealed jars start blue. Which treatment is most likely to retain the blue colour if illumination is sufficient for net photosynthesis? A. An aquatic plant and a…
Which factors limit photosynthesis near100light units and on the lower curve near700units? A. 100: CO₂; 700: light B. 100: temperature; 700: light C. 100: light; 700: oxygen supply D. 100: light; 700: CO₂
For this ordinary temperate plant, assume the optimum is above26°C and below45°C. Other factors remain suitable. Which extension towards70°C is most plausible? A. The rate increases without limit B. The rate immediately falls to zero at27°C and then rises C.…
Temperature is held constant while plants are tested at two light intensities. At 0.12% CO₂ under dim light, which change is supported as a way to increase photosynthesis by the results? A. Conclude that no environmental factor limits the rate B. Increase…
Plants are supplied with sufficient mineral nutrients and kept at their optimum temperature. CO₂ remains at ambient concentration. Which factor could limit the plateau reached at a light intensity of 360 units? A. Insufficient light at that point on this curve…
Explain the curve in terms of limiting factors.
State one variable that should be controlled when testing the effect of light intensity.
At 320 µL L⁻¹ CO₂ on the low-illumination curve, which factor is shown to limit the rate? Temperature is held constant. A. Carbon dioxide alone, because adding more immediately increases that curve B. Light availability, because stronger illumination increases…
An aquatic shoot is tested at several sodium hydrogencarbonate concentrations using the apparatus shown. The trial duration, illumination and temperature are kept constant. Which measurement is the dependent variable? A. The concentration assigned to each…
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