Cut surfaces of fruit and vegetables often become dark because

(a) dirty knife makes it dark

(b) oxidation of tannic acid in the presence of a trace of iron from the knife makes it dark

(c) dust of the air makes it dark

(d) none of the above

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Cotton fibres mainly contains

(a) cellulose            (b) glycogen

(c) protein              (d) lipid

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Which of the following sugars is not found in plants?

(a) Sucrose

(b) Glucose

(c) Lactose

(d) Fructose

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Jute fibres deteriorate quickly because

(a) cellulose content is high

(b) lignin content is high

(c) cellulose content is low

(d) lignin content is low

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In a 50 gm living tissue, what would be the amount of water?

(a) 15-25 gm                           (b) 25-30 gm

(c) 35-45 gm                           (d) 70-90 gm

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Which of the following elements is present in very less quantity in the body?

(a) K              (b) Ca

(c) Mg            (d) Cu

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In a normal adult, ascending order of concentration of following molecules is

(a) K>Na>Fe>Cu              (b) Na>K>Cu>Fe

(c) Fe>Na>K>Cu              (d) Na>Fe>K>Cu

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Select the option having all correctly matched pairs.

A. Alkaloids (i) Carotenoid; Anthocyanin

B. Pigments (ii) Vinblastin; curcumin

C. Drugs    (iii) Morphine; Codeine

(a) A-i;B-ii;C-iii                (b) A-ii;B-iii;C-i

(c) A-iii;B-i;C-ii                (d) A-i;B-iii;C-ii

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Which of the following is a homopolysaccharide?

(a) Heparin

(b) Inulin

(c) Pectin

(d) Hyaluronic acid

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From the following groups, select the one which has only secondary metabolites?

(a) Arbin, cellulose, arginine, tyrosine

(b) Glycine, gums, serine, diterpenes

(c) Carotenoids, phenylalanine, curcumin, rubber

(d) Conclavin-A, morphine, codeine, vinblastine

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