Science Class 5 Other

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

A plant was kept in a dark room for 48 hours and then its leaves were tested for starch using iodine. What will be the result and why?

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A Leaves turn blue-black because starch is present.
B Leaves stay brown because the plant used up its stored starch.
C Leaves turn green because they produced more chlorophyll.
D Leaves turn yellow because they absorbed iodine.

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Answer: B. Leaves stay brown because the plant used up its stored starch.

The correct answer is B. Without sunlight, the plant cannot perform photosynthesis to make new food. After 48 hours in the dark, the plant consumes its stored starch, so the iodine test will not show a blue-black color.

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A plant was kept in a dark room for 48 hours and then its leaves were tested for starch using iodine. What will be the result and why?

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