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Absorption of Carbohydrates

The plant in ...

Question

The plant in the given image is exposed to sunlight for few hours. Part B showed positive result for iodine test. What conclusion can be drawn from the above experiment?

A

Chlorophyll is the basic need for photosynthesis

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B

Sunlight is the basic need for photosynthesis

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C

Carbon dioxide is the basic need for photosynthesis

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Solution

The correct option is B Sunlight is the basic need for photosynthesis

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Q. In order to destarch the leaves for an experiment to show that sunlight is necessary for photosynthesis, the:
(1) leaves are kept in alcohol and boiled in a water bath
(2) leaves are soaked in iodine for two hours
(3) plant with the leaves is kept in dark room for 48 hours.
(4) plant with the leaves is exposed to light of a lamp, a night before the experiment

Q. An experiment was set up as shown in the adjoining figure. The twig in the diagram was intact on the plant and it was left as such in sunlight for a few hours.
(i) What is the aim of the above experiment?
(ii) Why was potassium hydroxide placed inside the conical flask?
(iii) What test would you perform on the leaf inside the flask?
(iv) What is the expected result of the above test?
(v) Is it necessary to similarly test on outer leaf also? Give a reason.
Figure

Q. A student is performing an experiment to show that sunlight is necessary for photosynthesis. In the first stage, he keeps a potted plant with green leaves in a dark place for about 3 days. Towards the end of the experiment, he boils one leaf in alcohol before using iodine for testing starch.
(a) Why is the plant kept in a dark place for about 3 days?
(b) Why is the leaf boiled in alcohol before testing for starch with iodine?

Given below is a set of six experimental set-ups (A-F), kept in this state for about 24 hours.

(a) In how many flasks, the different plant parts have been kept under observation?

(b) What is the purpose of keeping a test tube containing limewater in each flask?

(c) In which tube/tubes the limewater will turn milky?

(d) What conclusion can you draw from this experiment?

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Absorption of Carbohydrates

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