Why Are the Fruit Juices Bought from Market Clearer as Compared to Those Made at Home? - Biology


Why are the fruit juices bought from market clearer as compared to those made at home?



The fruit juices available in the market (the bottled ones) are made clarified by treating them with the enzymes- pectinases and proteases. So, they are clearer as compare to those made at home.

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2012-2013 (March) Delhi Set 1

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Alcoholic fermentation is brought about by ______.

Sketch and label 'tubular tower fermenter'.

In which way have microbes played a major role in controlling diseases caused by harmful bacteria?

Find out the name of the microbes from which Cyclosporin A (an immunosuppressive drug) and Statins (blood cholesterol lowering agents) are obtained

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Give the biological name of the following:

The mould from which penicillin is obtained.

Name the microbes that help the production of the following product commercially:

Ethanol is commercially produced through a particular species of ______.

What are A, B, C, and D in the table given below :

Types of microbe Name Commercial product
Fungus A Penicillin
Bacterium Acetobacter aceti


C Aspergillus niger Citric acid
Yeast D Ethanol

What is the main function of a fermenter?

Match the column A with B and rewrite correct pairs.

  A   B
1. citric acid a) in medicine for solubility of Ca++
2. fumaric acid b) confectionary
3. gluconic acid c) in resins as wetting agents

The most common substrate used in distilleries for the production of ethanol is _______.

Cyclosporin - A is an immunosuppressive drug produced from ____________.

CO2 is not released during ________.

The gases produced in anaerobic sludge digesters are _______.

Give any two bioactive molecules produced by microbes and state their uses.

Define the following term


Define the following term


Define the following terms


When does antibiotic resistance develop?

What is referred to as industrial alcohol? Briefly describe its preparation.

Write short notes on the following:

Microbial fuel cells

Which of the following microbe is used for the production of citric acid?

Which of the following is/are used for production of beverages like wine, beer, whiskey, brandy or rum?

What is the role of acidogenic bacteria in biogas plant?

Match Column I (Antibiotic) with Column II (Microbial Sources) and select the correct option.

  Column I   Column II
i. Chloromycetin a. Streptomyces erytreus
ii. Erythromycin b. Streptomyces venezuelae
iii. Bacitracin c. Streptomyces aureofaciens
iv. Terramycin d. bacillus licheniformis

Which of the following statement is INCORRECT?

Match Column I (Product) and Column II (Source organisms/Organisms used in production) and choose the correct option.

  Column I   Column II
i. Vitamin C a. S. cerevisiae
ii. Beer b. A. niger
iii. Chloromycetin c. Sclerotiana libertine
iv. Pectinase d. S. venezuelae

Which of the following microbe is used for producing Vitamin B12 on industrial scale?

In alcoholic fermentation:

Anaerobic respiration of yeast produces:

Which raw material is used in the fermentation processes of making beer?

Brandy is generally a product of:

Which one of the following processes involved in alcohol production is NOT involved in wine production?

Which of the following is used in detergents?  

Antibiotics are -

Match List - I with List - II.

List I List II
(a) Aspergillus niger (i) Acetic Acid
(b) Acetobacter aceti (ii) Lactic Acid
(c) Clostridium butylicum (iii) Citric Acid
(d) Lactobacillus (iv) Butyric Acid

Choose the correct answer from the options given below.

Why is distillation required for producing certain alcoholic drinks?

Write the most important characteristic that Aspergillus niger, Clostridium butylicum, and Lactobacillus share.

Name an immune immunosuppressive agent?

Name the scientists who were credited for showing the role of Penicillin as an antibiotic?

How do bioactive molecules of fungal origin help in restoring good health of humans?

Match the antibiotics in column I with their microbial sources in column II:

Column I Column II
(a) Chloromycetin (1) Streptomyces griseus
(b) Erythromycin (2) Streptomyces aurifaciens
(c) Streptomycin (3) Streptomyces venezuelae
(d) Terramycin (4) Streptomyces erythreus

Name the drug a patient who has undergone a successful organ transplant, has to take all his/her life.

Match the following pairs:

Column A Column B
Antibiotic produced Microbial source
(i)  Penicillin (a)  Streptomyces venezuelae
(ii)  Chloromycetin (b) Bacillus licheniformis
(iii) Bacitracin (c) Streptomyces aurifaciens
(iv) Erythromycin (d)  Streptomyces griseus
(v) Streptomycin (e) Penicillium chrysogenum
(vi)  Terramycin (f) Streptomyces erythreus

Identify the enzyme ‘A’ in a given reaction.

\[\ce{Fumaric acid + H2O ->['A']Malate}\]

______ is used for the production of beverages like wine, beer whiskey, brandy or rum.

Which among the three is produced by the distillation of a fermented broth?

  1. Whisky
  2. Wines
  3. Beer
  4. Rum
  5. Brandy

Given below are the list of the commercially important products and their source organisms. Select the option that gives the correct matches. 

  List A   List B
S No. Bioactive Products S. No.


(Source Organism)

(A) Cyclosporin A (i) Streptococcus
(B) Statins (ii) Trichoderma polysporum
(C) Streptokinase (iii) Penicillium notatum
(D) Penicillin (iv) Monascus purpureus

Write the microbial source of following organic acid.

Citric acid

Name the microbial sources of any two enzymes.

Name the microbial sources of any two vitamins.


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