Rate Of Photosynthesis (GCSE Biology)

In a controlled photosynthesis experiment using pondweed, which factor should be kept constant to ensure a fair test when comparing light colours?

Why does the rate of photosynthesis level off (plateau) at high light intensities?

Which factor directly provides the energy needed for the light-dependent reactions of photosynthesis?

On a graph of rate of photosynthesis against light intensity, which region could be modelled by a straight line y = mx + c?

Which experimental change would test the effect of CO2 concentration on rate of photosynthesis?

In investigations that measure rate of photosynthesis by counting bubbles of oxygen from pondweed, which variable is best used as the dependent variable?

A student uses a lamp and measures light intensity at various distances, then plots rate vs intensity. The line flattens at high intensity. Which conclusion is most valid?

Which of the following measurements would best show the effect of temperature on photosynthesis rate?

A plant enclosed in a sealed chamber shows zero net change in CO2 concentration over 24 hours. Which statement best explains this?

Why do leaf discs need to have air removed (e.g., by a syringe/vacuum) before starting the floating assay for photosynthesis?

When using a lamp and a single plant to investigate light intensity, why should the same plant be used for all different distances?