Question
The diagram below shows an experimental set up to investigate an aspect of germination.
(a) Why are the following used in this experiment?
(i) Potassium hydroxide pellets?
(ii) Moist cotton wool?
(b)
(a) Why are the following used in this experiment?
(i) Potassium hydroxide pellets?
(ii) Moist cotton wool?
(b)
(i) With reference to points x and y state the direction the dye would move towards during the experiment.
(ii) Give reasons for your answer in (b) (i)
Answer
(a)
- Absorb carbon (IV)oxide produced by germinating seedlings.
- Provide moisture /water for seeds to germinate.
(b)
(i) Towards Y; / X→Y;
(ii) Seeds use up oxygen in flask for respiration during germination; creating a vacuum in the flask; air is drawn in the tube at point A (causing the red dye to move towards Y)
- Absorb carbon (IV)oxide produced by germinating seedlings.
- Provide moisture /water for seeds to germinate.
(b)
(i) Towards Y; / X→Y;
(ii) Seeds use up oxygen in flask for respiration during germination; creating a vacuum in the flask; air is drawn in the tube at point A (causing the red dye to move towards Y)
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