Chapter Chosen

Microbes in Human Welfare

Book Chosen

Biology

Subject Chosen

Biology

Book Store

Download books and chapters from book store.
Currently only available for.
CBSE Gujarat Board Haryana Board

Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12

Mention a product of human welfare obtained with the help of each one of the following microbes:

 (a) LAB

 (b) Saccharomyces cerevisiae

 (c) Propionibacterium sharmanii

 (d) Aspergillus niger


The products obtained from:

(a)  LAB - Lacto acid bacteria is used in the production of curd from milk.

(b)  Saccharomyces cerevisiae is used for the production of ethanol.

(c)  Propionibacterium sharmanii is used in the production of Swiss cheese.

(d)  Aspergillus niger is used in production of citric acid.

922 Views

A good producer of citric acid is

  • Aspergillus

  • Pseudomonas

  • Clostridium

  • Saccharomyces


A.

Aspergillus

A good producer of citric acid is Aspergillus niger (a fungus). Clostridium produces butyric acid, Saccharomyces cerevisiae is used for bread baking fermenting malted cereals and fruit juices to produce ethanol. Pseudomonas (a bacterium) is used in Vitamin -B-12 production.

A good producer of citric acid is Aspergillus niger (a fungus). Clostridium produces butyric acid, Saccharomyces cerevisiae is used for bread baking fermenting malted cereals and fruit juices to produce ethanol. Pseudomonas (a bacterium) is used in Vitamin -B-12 production.

952 Views

Which one of the following is not a property of cancerous cells, whereas the remaining three are?

  • They compete with normal cells for vital nutrients. 

  • They do not remain confined in the area of formation

  • They divide in an uncontrolled manner

  • They show contact inhibition


D.

They show contact inhibition

Contact inhibition is the natural process of arresting cell growth when two or more cells come in contact with each other. It is a property of normal cells. Cancer cells divide in uncontrolled manner and do not show contact inhibition. 

Contact inhibition is the natural process of arresting cell growth when two or more cells come in contact with each other. It is a property of normal cells. Cancer cells divide in uncontrolled manner and do not show contact inhibition. 

530 Views

Match the following list of microbes and their importance:

(a) Sacharomyces cerevisiae (i) Production of immunosuppressive agents
(b) Monascus purpureus (ii) Riperuing of Swiss cheese
(c) Trichoderma polysporum (iii) Commercial production of ethanol
(d) Propionibacterium sharmanii (iv) Production of blood cholesterol lowering agents
  • Codes
     A   B   C    D
    3    4    1    2

  • A   B   C   D
    4   3    2   1

  • A   B   C   D
    4   2    1   3

  • A   B   C   D
    3    1   4   2


A.

Codes
 A   B   C    D
3    4    1    2

772 Views

Monascus purpureus is a yeast used commercially in the production of 

  • ethanol

  • streptokinase for removing clots from the blood vessels

  • citric acid

  • blood cholesterol-lowering statins


D.

blood cholesterol-lowering statins

Monascus purpureus is a yeast used in the production of statins which are blood cholesterol lowering agents. 

Monascus purpureus is a yeast used in the production of statins which are blood cholesterol lowering agents. 

456 Views

A patient brought to a hospital with myocardial infarction is normally immediately given

  • penicillin

  • streptokinase

  • cyclosporin - A

  • statins


B.

streptokinase

Streptokinase (SK), a protein secreted by several species of streptococci can bind and activate human plasminogen. It is used as an effective and inexpensive. It is used as an effective and inexpensive thrombolysis medication in some cases of myocardial infarction and pulmonary embolism.
Streptokinase (SK), a protein secreted by several species of streptococci can bind and activate human plasminogen. It is used as an effective and inexpensive. It is used as an effective and inexpensive thrombolysis medication in some cases of myocardial infarction and pulmonary embolism.
438 Views