We have two potted plants, 1 and 2. The plant in pot 1 is kept in light for 3 days, while the plant in pot 2 is kept in darkness for 3 days.

What colour will we get on performing iodine tests on the leaves of plant 1 and 2, respectively, after 3 days?

Brown, Blue-black

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Blue-black, Brown

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Blue-black, Blue-black

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Brown, Brown

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Solution

The correct option is B Blue-black, Brown

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Similar questions

Two potted green plants of the same kind were taken to perform an experiment. One of them was kept in a dark room, while the other one was kept in sunlight for 3–4 days. A leaf from each of the plant was taken to perform the iodine test. Which of the leaves turned blue-black in colour and why? [5 MARKS]

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?

Q. A student first keeps a potted plant having green leaves in a dark room for more than 3 days. He then takes out this potted plant from the dark room and places it in bright sunshine for about 3 days.
(a) Which substance present in the green leaves is all used up when the potted plant is kept in a dark room?
(b) What is this process known as?
(c) Which plant process uses up all the above substance from green leaves when the potted plant is kept in the dark room?
(d) Which process does not take place in the green leaves of the plant when it is kept in the dark room?

Q. For the experiment ‘Light is necessary for photosynthesis’, the potted plant was first kept in darkness for a day. This is to:
(1) deactivate chloroplasts
(2) destarch leaves
(3) activate chloroplasts
(4) prepare leaves for photosynthesis

Q. What is meant by destarched ? why do plants get destarched when kept in dark room for 3 days

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We have two potted plants, 1 and 2. The plant in pot 1 is kept in light for 3 days, while the plant in pot 2 is kept in darkness for 3 days. What colour will we get on performing iodine tests on the leaves of plant 1 and 2, respectively, after 3 days?

The correct option is B Blue-black, Brown

We have two potted plants, 1 and 2. The plant in pot 1 is kept in light for 3 days, while the plant in pot 2 is kept in darkness for 3 days.

What colour will we get on performing iodine tests on the leaves of plant 1 and 2, respectively, after 3 days?