ETV - Quiz on Living Things and Air

1. Which of the following about composition of unbreathed air is correct? Oxygen: about 16.11%, Carbon dioxide: about 0.07% Oxygen: about 16.11%, Carbon dioxide: about 4.10% Oxygen: about 21.15%, Carbon dioxide: about 0.07% Oxygen: about 16.11%, Carbon dioxide: about 4.10%

2. Which of the following about composition of breathed air is correct? Oxygen: about 16.11%, Carbon dioxide: about 0.07% Oxygen: about 16.11%, Carbon dioxide: about 4.10% Oxygen: about 21.15%, Carbon dioxide: about 0.07% Oxygen: about 16.11%, Carbon dioxide: about 4.10%

3. If the concentration of carbon dioxide is lower than 0.03%, the colour of hydrogencarbonate indicator is yellow. red. blue. purple.

4. Which of the following reagent is used to test for water and water vapour? Hydrogencarbonate indicator Lime water Dry cobalt chloride paper Iodine solution

5. Which of the following reagent can show the concentration of carbon dioxide? Hydrogencarbonate indicator Lime water Iodine solution Sodium hydrogencarbonate solution

6. In the experiment of rat in the thermal flask, the watermark of the test tube in the empty thermo flask rises. Why? The air pressure of the test tube in the thermo flask with the rat has increased The air pressure of the test tube in the thermo flask with the rat has increased. The air pressure of the thermal flask with the rat decreased. The rat in the thermal flask released carbon dioxide. The rat in the thermal flask absorbed oxygen.

7. The air pressure of the test tube in the thermo flask with the rat has increased. Why? The rat released carbon dioxide, causing air pressure inside the thermo flask to increase. The rise in temperature in the flask causing air in the flask to expand. The rat absorbed oxygen, causing air pressure inside the thermo flask to increase. The rat released oxygen, causing air pressure inside the thermo flask to increase.

8. Which of the following comparison between burning and respiration is correct? Burning releases more energy than respiration. Process of respiration is faster than burning Process of respiration is faster than burning. Respiration requires oxygen, burning does not. Respiration takes place inside human body cells, burning does not.

9. In the experiment about germinating seeds, alcohol is poured into a funnel containing germinating seeds. Why? Stop photosynthesis in the seeds. Kills the seeds. Kill the germs on the surface of the seeds. Wash the seeds.

10. In the experiment about germinating seeds, the test tubes containing seeds are placed into a beaker of water. Why? Prevent the seeds from drying. No special reason. To provide a warm environment for the seeds. For keeping the test tubes at the same temperature.

11. In the experiment of germinating seeds, the red-link in the set-up with geminating seeds rmoved downward. Why? Seeds undergo photosynthesis and absorbed carbon dioxide in the test tube. Carbon dioxide released by germinating seeds during respiration is absorbed by sodium hydroxide in the test tube. Seeds absorbed oxygen in the test tube. Seeds released heat during respiration.

12. Before carrying out experiment about photosynthesis, the green plant involved is placed in a dark chamber for several days. Why is this so? Allow the plant to release carbon dioxide in the dark. Allow the plant to consume all the carbon dioxide it stored. To eliminate the product of photosynthesis in the leaves. Prevent the plant from absorbing carbon dioxide.

13. Which of the following is used to test for starch? Hydrogencarbonate indicator Lime water Sodium hydrogencarbonate solution Iodine solution

14. In the iodine test, what can be removed if we put a leaf in hot alcohol? Cell wall Chlorophyll Starch Water

15. The products of photosynthesis are water and carbon dioxide. carbon dioxide and starch. starch and oxygen. oxygen and water.

16. The products of respiration are food 、 oxygen and water. oxygen 、 water and energy. carbon dioxide 、 water and energy. water 、 energy and food.

17. At night, green plants will release oxygen. release carbon dioxide. release hydrogen. release nitrogen dioxide.

18. When will plants release carbon dioxide? At daytime At night At daytime and night Never

19. Which of the following can balance carbon dioxide and oxygen in nature? Respiration and greenhouse effect Photosynthesis and burning Photosynthesis and greenhouse effect Respiration and photosynthesis