ICSE 2000 : SCIENCE Paper 3 (Biology) - Question 5(b) Diagrammatic questioning.

SCIENCE

Paper 3 (Biology) - 2000

(One Hour and a half)

Question 5
(b) The given diagram refers to an experiment in which the apparatus was set up with light source 10 cm away from the plant. After 15 minutes the number of bubbles evolved per minute from the cut stem was recorded. The light source was moved to 20 cm away from the plant for 15 minutes and the number of bubbles evolved per minute was again recorded. The experiment was repeated with the source of light at distances of 40, 60, 80 and 100 cm away from the plant. The result obtained were recorded on the graph. Select the correct answer out of the available choices given under each question.

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1.
(1) From the graph it seems likely that the rate of bubbling per minute at 50 cm would have been:
(i) 2.0 (ii) 2.5 (iii) 3.0 (iv) 3.5 (v) 4.0

2.
(II) The gas produced by the plant during the experiment was
(i) air (ii) oxygen
(iii) carbon dioxide (iv) nitrogen
(v) hydrogen

3.
(III) The gas collected comes due to the breakdown of:
(i) glucose (ii) starch
(iii) water (iv) air
(v) ATP

4.
(IV)If ice cubes were added to the water the rate of bubble formation would: (i) stay the same.
(ii) increase because more water is added. (iii) decrease because the temperature drops. (iv) decrease because water freezes. (v) cannot tell from the information given.

5.
(V) If some sodium bicarbonate is added to the water the rate of bubble formation: (i) increases because more respiration occurs. (ii) increases because more photosynthesis occurs. (iii) increases because the gas becomes less soluble. (iv) decreases because carbon dioxide acts as a limiting factor.
(v) decreases because respiration occurs

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