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Question
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?
Options:
A .  Plasmid
B .  Plastids
C .  Vacuole
D .  Endoplasmic reticulum
Answer: Option B
:
B
Plastid is a smalldouble-membraned organelleofplantcells, occurringinseveralvarieties,asthechloroplast,containing ribosomes,prokaryoticDNA,andpigment.

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