Bio ( Experiment 3 )

AIM: Carbon dioxide is given out during respiration -------------------------------------------------------------------------------1.Seeds which are taken during respiration must be a. dry b. germinating

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c. just wet d. none of these 2. When carbon dioxide combines with lime water it turns a. yellowish b .bluish c. milky

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d. blackish 3.Which of the following substance is used to make all connections airtight in the experiment to show that carbon dioxide is produced during respiration? a. oil b. Vaseline

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c. ghee d. cotton 4. Name the chemical taken in the small test tube inside the conical flask. a. water b. seeds c. alcohol d. potassium hydroxide

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6. A small test tube containing 20% solution of KOH absorbs a. oxygen b. carbon dioxide

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c. air d. all of these 7. Pick the odd one out

a. fermentation b. aerobic respiration c. anaerobic respiration d. breathing

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8.A student performed starch test like this - (i) leaf in boiling water, (ii) leaf in iodine solution (iii) leaf in ethanol heated in a water bath (iv) leaf in water at room temperature. the correct sequence of steps should be a. iv, iii, ii, i b. i, ii, iii, iv c. ii , iii, iv, i d. i, iii, iv, ii

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9. A student sets up the apparatus for the experiment to show that carbon dioxide is released during respiration. After 2 hours he would observe a. KOH turns milky b. water level rising in the bent tube in the beaker

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c. water level decreasing in the bent tube in the beaker d. water turning turbid in the beaker 10. water rises in the bent tube because a. seeds use up oxygen in the flask b. carbon dioxide is given out by the germinating seeds c. germinating seeds attract water from the beaker d. seeds use oxygen and release carbon oxide which is absorbed by KOH. >>>> 11. To show respiration experiment two students A and B set up experiment separately. A used cotton plug to hold the bent tube in the mouth of the flask and B used rubber cork. After 4 hours they noticed that a. water level increased in the bent tube of A b. water level increased in the bent tube of B

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c. the cotton plug was wet d. water in the beaker B turned milky. 12. Tick the correct statement a. oxygen is more soluble in water than carbon dioxide b. carbon dioxide is insoluble in water

c. both oxygen and carbon dioxide are equally soluble in water d. carbon dioxide is more soluble in water than oxygen. >>>>>>>>>>