The equation, starch and limiting factors
Answers are for parents and teachers.
1
Count the atoms on each side of 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ to show that it is balanced.
Each side has 6 C, 12 H and 18 O.
2
Explain why the light-independent reactions stop at night even though they do not use light directly.
They need the products of the light stage, which stops without light.
3
Sketch the shape of a graph of photosynthesis rate against temperature, and mark the best temperature.
The curve rises to a peak at the best temperature, then falls to nothing near 50 °C.
4
Name three foods that are store organs rich in starch.
For example potato tubers, sweet-potato roots and taro corms.
5
Find the mistake: “Oxygen is a waste product that the plant would be better without.”
Oxygen is a by-product that living things use for respiration.