Yeast is used in the production of
(i) sugar
(ii) alcohol
(iii) hydrochloric acid
(iv) oxygen
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The two forms of oxygen found in the atmosphere are (a) water and ozone (b) water and oxygen (c) ozone and oxygen (d) water and carbon-dioxide
(c) ozone and oxygen
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The following is an antibiotic (i) Sodium bicarbonate (ii) Streptomycin (iii) Alcohol (iv) Yeast
(ii) Streptomycin
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The bread or idly dough rises because of (i) heat (ii) grinding (iii) growth of yeast cells (iv) kneading
(iii) growth of yeast cells
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The process of conversion of sugar into alcohol is called (i) nitrogen fixation (ii) moulding (iii) fermentation (iv) infection
fermentation
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The process of conversion of sugar into alcohol is called (i) nitrogen fixation (ii) moulding (iii) fermentation (iv) infection
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Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution.
Turmeric is yellow in colour. When a base is added to it, the solution turns into pink colour. However turmeric remains yellow when an acid or neutral solution is added...
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Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
(a) physical change that can be reversed.
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A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar
(a) The CO2 released during respiration by the yeast results in the rise of dough. (b) During anaerobic respiration, yeast produces alcohol resulting in sour smell. (c) Sugar acts as food for...
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Vinegar is a solution of (A) 50% – 60% acetic acid in alcohol (B) 5% – 8% acetic acid in alcohol
(C) 5% – 8% acetic acid in water
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Colonies of yeast fail to multiply in water, but multiple in sugar solution. Give one reason.
Sugar provides energy for sustaining all life activities in yeasts. In water, it fails to reproduce because of inadequate energy in its cells.
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