(a)[2]
Young rice roots are highly tolerant of ethanol. Explain in what way this enables them to survive when the fields are flooded.
(b(i))[2]
Describe what the endosperm does.
(b(ii))[2]
Using the structure of rice grains as reference, suggest why brown rice has a higher protein content than white rice.
(b(iii))[1]
Explain why the carbohydrate content per gram is lower in brown rice than in white rice.
(b(iv))[2]
Explain why cereal grains such as rice are staple foods in many parts of the world.