Raghav kept a plant in a dark room for a week. The leaves started to look white and waxy. His mother advised him to keep the plant in a place where there was light directly falling on the plant. So he replaced the plant on the window sill where there was direct sunshine. The leaves turned green again. Which of these organelles do you credit for this change?

Plasmid

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Plastids

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Vacuole

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Endoplasmic reticulum

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Solution

The correct option is B
Plastids

Plastid is a small double-membraned organelle of plant cells, occurring in several varieties, as the chloroplast, containing ribosomes, prokaryotic DNA, and pigment.

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Raghav kept a plant in a dark room for a week. The leaves started to look white and waxy. His mother advised him to keep the plant in a place where there was light directly falling on the plant. So he replaced the plant on the window sill where there was direct sunshine. The leaves turned green again. Which of these organelles do you credit for this change?

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?

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 potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
Why was the plant placed in the dark before beginning the experiment?

A potted plant was kept in the dark room for 48 hours prior to an experiment on photosynthesis. The purpose of keeping the plant in dark room is:

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The correct option is B Plastids Plastid is a small double-membraned organelle of plant cells, occurring in several varieties, as the chloroplast, containing ribosomes, prokaryotic DNA, and pigment.

The correct option is B
Plastids

Plastid is a small double-membraned organelle of plant cells, occurring in several varieties, as the chloroplast, containing ribosomes, prokaryotic DNA, and pigment.