# B4.4.1.2

## Content

Students should be able to explain the effects of temperature, light intensity, carbon dioxide concentration, and the amount of chlorophyll on the rate of photosynthesis.

Students should be able to:

• measure and calculate rates of photosynthesis
• extract and interpret graphs of photosynthesis rate involving one limiting factor
• plot and draw appropriate graphs selecting appropriate scale for axes
• translate information between graphical and numeric form.
• (HT only) These factors interact and any one of them may be the factor that limits photosynthesis.
• (HT only) Students should be able to explain graphs of photosynthesis rate involving two or three factors and decide which is the limiting factor.
• (HT only) Students should understand and use inverse proportion – the inverse square law and light intensity in the context of photosynthesis.
• (HT only) Limiting factors are important in the economics of enhancing the conditions in greenhouses to gain the maximum rate of photosynthesis while still maintaining profit.

Describe and explain specified examples of the technological applications of science. Describe and evaluate, with the help of data, methods that can be used to tackle problems caused by human impacts on the environment.

Recognise and use expressions in decimal form,

Use ratios, fractions and percentages,

Construct and interpret frequency tables and diagrams, bar charts and histograms,

Translate information between graphical and numeric form,

Plot two variables from experimental or other data,

Solve simple algebraic equations,

Understand and use the symbols: =, <, <<, >>, >, ∝, ~,

Solve simple algebraic equations