NSO Level 1- Science Olympiad (SOF) Class 7: Questions 228 - 230 of 597

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Question number: 228

» Physical and Chemical Changes

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MCQ▾

Question

Priya took 2 destarched potted plants X and Y and set up an experiment as shown in the figure. She left both the plants in sunlight for few hours and then tested the plants X and Y for starch. Plant X showed presence of starch while plant Y gave negative results for starch test.

Image of the potted plants X and Y

Image of the Potted Plants X and Y

What is proved by this?

Choices

Choice (4)Response

a.

Light is necessary for photosynthesis.

b.

Chlorophyll is necessary for photosynthesis.

c.

Carbon dioxide is necessary for photosynthesis.

d.

None of the above

Question number: 229

» Fibre to Fabric

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MCQ▾

Question

Which of the following bacterium is responsible for causing Sorter’s disease to people working for sorter’s job in wool industry?

Job in wool industry

Job in Wool Industry

Choices

Choice (4)Response

a.

Bacillus subtilis

b.

Bacillus anthracis

c.

Bacillus thuringiensis.

d.

Escherichia coli

Question number: 230

» Fibre to Fabric

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MCQ▾

Question

The main cause of respiratory problems that workers in silk industry suffer is

Choices

Choice (4)Response

a.

Loud, deafening sound of machines running in the background.

b.

Cramped, damp, dark and poorly ventilated work space.

c.

Checking of the hot water to see whether the silk threads have loosened enough to be removed from the cocoons.

d.

Inhalation of vapours from the boiling cocoons and the diesel used to run machines.

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