What is ductility ?
The property of metal by which it can be drawn into wires is called ductility.
The property of metal by which it can be drawn into wires is called ductility.
The property of metals by which they can be beaten into thin sheets called malleability.
Microorganisms include bacteria, fungi, protozoa and some algae. Viruses, though different from the above mentioned living organisms, are considered microbes.
Protozoans cause serious diseases likedysentery and malaria.
Viruses are quite different from other microorganisms. They reproduce only inside the host organism: bacterium, plant or animal cell.
Some microorganisms reside in the root nodules of leguminous plants. They can fix nitrogen from air into soil and increase the soil fertility.
Some of the microorganisms grow on our food and cause food poisoning.
A)Chemical MethodSalts and edible oils are the common chemicals generally used to check the growth of microorganisms. Thereforethey are called preservatives. We add salt or acid preservatives to pickles to prevent the attack of microbes. Sodiumbenzoate and sodium meta bisulphite are common preservatives 1)Preservation by Common SaltCommon salt has been used to preserve meat and …
Edward Jenner discovered the vaccine for smallpox in 1798.
Nitrogen cycleOur atmosphere has 78% nitrogen gas. Nitrogen is one of the essential constituents of all living organisms as part of proteins, chlorophyll, nucleic acids and vitamins. The atmospheric nitrogen cannot be taken directly by plants and animals. Certain bacteria and blue green algae present in the soil fix nitrogen from the atmosphere and convert …