Study the set-ups shown below. Each test tube contains few bean seeds on the cotton wool. Farheen wants to carry out an experiment to show that warmth of the light is needed for germination to take place. Which of the two set-ups should she use?

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Q. Which one of the following is the correct set of three precautions for setting up the experiment to demonstrate that carbon dioxide is evolved during respiration?
(1) Air tight set up; delivery tube dips in water in beaker; flask has seeds which have just germinated.
(2) Thread holding KOH test tube; air tight flask; delivery tube above surface of water in the beaker.
(3) Germinated seeds under water in the flask; experimental set up not air tight; delivery tube above water level.
(4) Delivery tube touching bottom of water; KOH test tube held by a thick wire; seeds covered by water.

Q. An experimental set-up to demonstrate respiration in germinating seeds is shown here. It is observed that water from the beaker has not risen into the delivery tube (bent tube). This is because :

(1) the set-up is airtight
(2) the beaker has coloured water
(3) carbon dioxide is not being absorbed
(4) no oxygen is available to seeds for respiration

Q. Before setting up an experiment to show that seeds release carbon dioxide during respiration, the seeds should be:
(1) dried completely
(2) boiled to make them soft
(3) soaked in potassium hydroxide solution
(4) kept moist till they germinate

The figure given below represents an experimental set up with a weighing machine to demonstrate a particular process in plants. The experimental set up was placed in bright sunlight. Study the diagram and answer the following questions :

(a) Name the process intended for study.

(b) Define the above mentioned process.

(c) When the weight of the test tubes A and B is taken before and after the experiment, what change is observed ? Justify.

(d) What is the purpose of keeping the test tube B in the experimental set up ?

In an airtight experimental set-up that was used by you in the laboratory to study respiration in germinating seeds, the seeds obtained the oxygen for respiration from?

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