The bread dough rises because of :
(a) heat (b) grinding (c) growth of yeast cells (d) kneading
(a) "Respiration is a vital function of the body". Justify this statement. (b) What is the main difference between aerobic respiration and anaerobic respiration ? Give one example of each. (c) What type of respiration takes place (i) in yeast, and (ii) in humans?