Biology today

MTMTBIOLOGY TODAYBIOLOGY TODAY || march ‘16march ‘16 3737

22. match column-I with column-II. (There can be more than
    one match for items in column-I).
    Column-I Column-II
    a. Proteases (i) Azospirillum
    B. Gluconic acid (ii) Mortierella renispora
    c. Biocontrol agents (iii) Nucleopolyhedrovirus
    D. chloramphenicol (iv) Aspergillus niger
    E. Biofertiliser (v) Azotobacter
    (vi) Bacillus species
    (vii) Trichoderma
    (viii) Penicillium
    (ix) S. venezuelae
    (x) S. lavendulae
    Passage Based Questions

23.(A) complete the given passage with appropriate words or
phrases.

microbes especially (i) have been used from time
immemorial for the production of beverages like wine,
beer, (ii) , (iii) or (iv). Yeast (v) used for bread-making
and commonly called brewer’s yeast, is used for fermenting
malted cereals and fruit juices, to produce (vi). Depending
on the type of the raw material used for fermentation and
the type of processing (with or without distillation) different
types of alcoholic drinks are obtained. Wine and beer are
produced (vii) whereas whisky, (viii) and rum are produced
by (ix) of the (x) broth.

(B) read the given passage and correct the errors, wherever
present.
cyclosporin a is an six membered cyclic oligopeptide
obtained through distillation of fungus Candida lipolytica.
It is antifungal, having inflammatory properties. It inhibits
activation of B-cells and helps in prevention of rejection
reactions in organ transplantation. Statins are produced
by activity of yeast Saccharomyces cerevisiae. It facilitates
cholesterol synthesis and therefore, is used for increasing
blood cholesterol.

Assertion & reason

In each of the following questions, a statement of assertion
(a) is given and a corresponding statement of reason (r)
is given just below it. Of the statements, mark the correct
answer as :
(a) if both a and r are true and r is the correct explanation
of a
(b) if both a and r are true but r is not the correct explanation
of a
(c) if a is true but r is false
(d) if both a and r are false.

24. Assertion : The antibiotics produced by Streptomyces
    species have found greatest commercial application.
    Reason : Some of the important life saving antibiotics
    such as penicillin and polymixin-B are produced by
    Streptomyces.


25. Assertion : Yeasts should not be used in brewing and
    baking industries.
    Reason : Yeasts produce several harmful products during
    brewing and baking.


26. Assertion : Statins inhibit cholesterol synthesis and
    are used in lowering blood cholesterol.
    Reason : Statins resemble mevalovate and are
    competitive inhibitors of hmG coa reductase.


27. Assertion : Energy value of biogas is lower than that
    of organic matter.
    Reason : Biogas minimises the chances of spread of
    fecal pathogens.


28. Assertion : Griseofulvin extracted from P. griseofulvum
    is used for ringworm treatment.
    Reason : Trichophyton, Epidermophyton, etc. cannot
    grow well in presence of Penicillium griseofulvum.

figure Based Questions

29. refer to the given flow chart and answer the following
    questions.

Milk is incubated

with curd

Growth of

LAB

Production

ofA

Coagulation and digestion

of milk protein

Improved

nutritional quality due to

increasedB

(a) Identify the missing parts a and B.

(b) What is the optimum temperature at which the above

mentioned process occur and the role of bacteria in

the process?

30. refer to the given flow chart and answer the following
    questions.

Primary treatment

Primary sludge

Secondary

treatment

Large

aeration tank

formationBiogas B Flocs

Effluent

A

D C Sedimentation

(a) Identify the parts labelled a, B, c and D.

(b) Describe how part labelled c is helpful in producing

biogas.