Directions For Questions

Study the following statements regarding lactic acid bacteria (LAB) which are used to convert milk into curd.

(i) They produce adds that coagulate and partially digest the milk proteins.

(ii) A small amount of curd added to the fresh milk as an inoculum contains millions of LAB, which at suitable temperature, multiply and convert milk into curd.

(iii) Conversion of milk into curd improves its nutritional quality by increasing vitamin B₁₂.

(iv) LAB may result in acidity in the stomach of human beings.

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Which of the given statements are correct?

Biology Test - ...

Question 1

Both statements 1 and 2 are correct

Statement 1 is incorrect but statement 2 is correct

Statement 1 is correct but statement 2 is incorrect

Both statements 1 and 2 are incorrect

Question 2

T cells mature in B

B and T cells undergo maturation in C

B and T cells undergo proliferation and differentiation in A

B cells mature in D

Question 3

Histamine

Antigens

Mucus

Antibodies

Question 4

A-I, B-III, C-II, D-IV

A-IV, B-III, C-I, D-II

A-III, B-I, C-IV, D-II

A-II, B-IV, C-III, D-I

Question 5

In stage - I, anaerobic microorganisms bring about enzymatic breakdown of complex organic compounds into simple soluble compounds or monomers.

In stage - II, monomers are converted into organic acids by fermentation causing microbes.

In stage - Ill, organic acids are acted upon by methanogenic bacteria to produce biogas.

All of these.

Question 6

Trichoderma polysporum

Bacillus thuringiensis

Streptococcus

Mycorrhiza

Question 7

(i) and (ii)

(ii) and (iii)

(i), (ii) and (iii)

(i), (ii), (iii) and (iv)

Question 8

A-(ii) B-(iii) C-(iv) D-(i)

A-(ii) B-(iv) C-(i) D-(iii)

A-(iii) B-(i) C-(ii) D-(iv)

A-(iv) B-(ii) C-(i) D-(iii)

Question 9

A-Restriction endonuclease, B-Restriction endonuclease, C-Hydrolase, D-Transduction

A-Restriction endonuclease, B-Restriction endonuclease, C-DNA ligase, D-Transformation

A-Restriction endonuclease, B-Restriction endonuclease, C-Hydrolase, D-Transformation

None of these

Question 10

(a) Cellulase (b) Lipase

(a) Cellulase (b) Protease

(a) Cellulase (b) Chitinase

(a) Chitinase (b) Lipase

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