Month
Assessment of Biology (Photosynthesis - Plant Nutrition)
Name:_______________________ Class:__________________
Q1. Scientists
investigated how temperature affects the rate of photosynthesis.
The scientists grew some orange trees in a greenhouse.They used discs cut from the leaves of the young orange trees.The scientists used the rate of oxygen production by the leaf discs to show the rate of photosynthesis.
The scientists grew some orange trees in a greenhouse.They used discs cut from the leaves of the young orange trees.The scientists used the rate of oxygen production by the leaf discs to show the rate of photosynthesis.
(i) The leaf discs
did not produce any oxygen in the dark. Why? (2)
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(ii) The
leaf discs took in oxygen in the dark. Explain why. (2)
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In their investigation, the scientists measured the rate of oxygen
release by the leaf discs in the light. The scientists then measured the rate
of oxygen uptake by the leaf discs in the dark.
The graph shows the effect of temperature on
• oxygen production in the light
• oxygen production in the light added to oxygen uptake in
the dark.
Use the information from the
graph to answer each of the following questions.
(i) Describe the
effect of temperature on oxygen production in the light.(2)
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(ii) Explain the
effect of temperature on oxygen production in the light when the temperature is
increased:
from 25 °C to 35 °C _________________________________________________________________________________________________________________________________________________________________________________________________________________________________
from 40 °C to 50 °C.
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