Chemistry

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

(b) Artificial sweeteners do not provide any calories because they are inert and do not metabolise in the body.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

(b) Preservatives are added to the food items because they inhibit the growth of microorganisms.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

(c) Chemicals which are added to food items to prevent them from spoiling against bacteria yeast and moulds are called food preservatives. They do not increase nutritive value of food.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

  (d) Chemical messenger binds the receptor site and gives the message to the cell without entering the cell.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

(b) Chemical messenger gives message to the cell without entering the cell because it is received at the binding site of the receptor.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

  (e) Non-competitive inhibitors inhibit the catalytic activity of enzyme by binding with its allosteric site.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

(d) In competitive inhibition, inhibitor binds to the active site of the enzyme.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

  (a) Hydrolysis of esters of long chain fatty acids by alkali gives soap a colloid. The process is called saponification.
Sodium chloride is added to precipitate soap which is in colloidal form.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

  (d) Ethanol removes air and moisture which scatter light.

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Payal Gupta

Contributor-Level 10

This is a assertion and reason answer type question as classified in NCERT Exemplar

  (d) Chemicals bind to the receptors sites present on the surface of the membrane on the cell, but never enter the cell through receptor.

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