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Biology

Biology
Plant tissues are of how many types?

5
3
6
2

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Biology
Which organelle performs cellular respiration?

Cytolasm
All of these
Mitochondria
Chloroplasts

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Biology
Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called

carotene
melanin
flavoxanthin
Xanthophyll

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Biology
Smallest cell in human body is

None of these
Sperm
Nerve cell
Ovum

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Biology
Which is the innermost layer of the heart

Pericardium
Epicardium
Myocardium
Endocardium

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Biology
Rate of breathing in a minute by man is

15311
20-25
16-18
70-72

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