MCQ
Fires in underground coal mines usually occur due to the:
- AExplosive combustion
- BDeliberate combustion
- ✓Spontaneous combustion
- DRapid combustion
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$(i)$
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Robert Brown discovered nucleus in the cells.
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$(ii)$
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The plasma membrane is made up of a double layer of lipid molecules and protein molecules.
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$(iii)$
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Chloroplast helps in osmoregulation and maintains the osmotic pressure in a cell.
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$(iv)$
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Carbohydrates and fats are completely oxidised with the help of enzymes present in the mitochondria.
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