Biology 9-1 0970: Gas Exchange and Respiration Topical Past Paper Questions

A student investigated the rate of respiration in yeast using different concentrations of glucose. They used a 5% glucose solution to make a 1% glucose solution and a 4% glucose solution. The student used this method: Step 1 Label two small test-tubes 1% and 4%. Step 2 Use a syri…

(a) Fig. 2.1 is a diagram of the gas exchange system in humans. Fig. 2.1 (i) State the names of the parts labelled X, Y and Z in Fig. 2.1. X ..... Y ..... Z ..... [ (ii) The wall of the trachea contains rings of tissue. State the name of this tissue and describe its function. nam…

A student investigated the effect of temperature on the rate of respiration in yeast cells. When yeast cells respire they release carbon dioxide gas. The student used this method: Step 1 Fill a syringe with 15cm $ ^{3} $ of yeast suspension. Step 2 Gently lower the syringe into t…