After a vigorous exercise,you may experience cramps in your leg muscles. Why does this happen?

Name the glands associated with the digestion of starch in the human digestive tract and mention their role. How is the required $pH$ maintained in the stomach and small intestine?

Assume that you are a veterinary surgeon and you have removed a significant length of the small intestine of a bear suffering from an intestinal tumour. After its recovery,would you suggest a plant-based or a meat-based diet for the bear? Provide a reason for your answer.

Choose the forms in which most plants absorb nitrogen.
$(i)$ Proteins
$(ii)$ Nitrates and Nitrites
$(iii)$ Urea
$(iv)$ Atmospheric nitrogen

Which part of the alimentary canal receives bile from the liver?

Two green plants are kept separately in oxygen-free containers,one in the dark and the other in continuous light. Which one will live longer? Give reasons.