Rate Of Photosynthesis (GCSE Biology)

Which practical method is commonly used to measure the rate of photosynthesis by collecting gas?

If a student wants to show that blue light gives a faster rate than green light using leaf discs, which control is essential?

In a leaf disc photosynthesis experiment the time for leaf discs to float is recorded. What does a shorter time indicate?

In an experiment using a lamp and pondweed, the student moved the lamp from 20 cm to 40 cm from the pondweed. According to the inverse square law, what happens to light intensity at the pondweed?

In an experiment the light source is a bulb of fixed power. To change light intensity at the plant you move the bulb closer or further away. Which law explains how intensity changes with distance?

Why are variegated (partly white) leaves useful in investigating photosynthesis and starch production?

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

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

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

Which of the following is a direct product of the light-dependent reactions that is used in the Calvin cycle (light-independent stage)?

A graph of photosynthesis rate vs light intensity shows that at very low light the curve is nearly flat near zero. What does this region represent?