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2021-09-23 13:01:32 Download PDF of Class 11th & 12th NCERT Examplar Questions Chapterwise.
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2021-09-22 20:45:24 Notes on Microbes in Human Welfare (Part-3)

(f) Vinegar: Country made vinegar is a fermentation product of cane juice, molasses or fruit juices. It is produced in two steps – first conversion of sugars into alcohols by alcholic fermentation carried by yeast, and the second, conversion of alcohol to acetic acid by the action of bacteria Acetobacter (A. orieansis, A. acetic, A. schuizenbachi, etc.). Vinegar is used in the preparation of pickles or in place of acetic acid. It is used as preservative of meats and vegetables.

(v) Role of bacteria in human being: E.coli (gram-ve) bacteria live in colon region of intestine of man and other animals and play an important role in digestion process.

(vi) Medicinal uses

(a) Vitamins: Production of riboflavin (vitamin B2) involves the activity of bacterium – Clostridium butyticum. The well known vitamin C (ascorbic acid) is produced from sorbital by the action of Acetobactor spp.

(b) Serum and vaccines: Many bacteria are used in the preparation of serums and vaccines. These substances induce immunity to various diseases in man. Serums are effective against certain diseases like diphtheria, pneumonia, etc., whereas the vaccines are effective against typhoid, smallpox, cholera, etc.

(c) Enzymes: Some bacteria live in the alimentary canal of herbivorous animals like cow, horse, goat, etc. and help in the production of certain enzymes which digest the cellulose. The enzymes proteases are produced by bacteria Bacillus subtilis. Similarly, the enzyme pectinase is produced by Clostridium sp, which is used in retting of flax.

(d) Antibiotics: These are the chemical substances produces by living microorganisms capable of inhibiting or destroying other microbes. These are the products of secondary and minor metabolic pathways, mostly secreted extracellularly by the microorganisms. These are used in controlling various infectious diseases.

At present more than 5000 antibiotic substances are known and approximately 100 are available for medicinal use. The most important bacterium which produces maximum number of antibiotics is Streptomyces. Open / Comment

2021-09-22 19:55:26 Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi
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2021-09-21 21:23:15 Force and Pressure

When an object is either pushed or a pulled is known as a force.
Motion, generated in an object, is because of an action of a force.
The applied force makes the table move in a given direction.
The strength of a force is commonly expressed by the magnitude.
Force also has direction; likewise, if the magnitude or direction changes, it directly affects the force.
If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the object.
If an object is in motion, then external force may change in the state or direction of motion of that object.
The state of motion of an object is explained by its speed and the direction of motion.
The state of ‘rest’ of an object is considered to be the zero speed, as
An object cannot move by itself.
An object cannot change its speed by itself.
An object cannot change its direction by itself.
An object cannot change by itself.
A force may make an object move from rest.
A force may change the speed of a moving object.
A force may change the direction of a moving object.
A force may change the shape of an object.

The force caused by the action of muscles is known as the muscular force.
Some force, decreases the speed of a moving object, is known as ‘friction.’ E.g. moving wheel on road; once the source of force stops working, then wheel stops because of friction.
The force applied by a charged body on another charged or uncharged body is known as ‘electrostatic force.’
Objects or things that fall towards the earth, as earth pulls it towards itself; this force is known as the force of gravity or gravity.
The force of gravity is applicable on all objects. In fact, every object in this universe, irrespective of its size and shape, exerts some force on every other object. It happens only because of the ‘gravitational force.’

Pressure
The force, applied on a unit area of a surface is known as pressure
Pressure= force / area on which it acts.

If the area is smaller, then the pressure on a surface would be greater; e.g. this is the reason that the area of one end of a nail is pointed to exert sufficient pressure and other end is bigger.
This envelop of air is known as the atmosphere that extends up to many kilometers above the surface of the earth.
The pressure exerted by the air is known as atmospheric pressure.
The pressure inside our bodies is exactly equal to the atmospheric pressure and annuls the pressure acting from outside.
Liquids and gases also exert pressure on the walls of their respective containers. Open / Comment

2021-09-21 19:14:12 Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi
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2021-09-20 20:02:23 The Human Heart
Well explained with graphics, animations and flowcharts.

Let's know in depth about the most important muscle of your body.

https://sciencewallah.com/2021/09/human-heart-structure-and-functions-with-flowcharts/

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2021-09-20 18:35:02 Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi
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