Microbes and disease – Explained With Video and pictures. CBSE Class 9 grade Standard Science Microbes and disease with Video, learn by reading and watching Microbes and disease, Microbes and disease for class XIth, Easy to understand Microbes and disease, Class 9 standard video, a way to learn Microbes and disease, learn from the best, Microbes and disease explained with pictures and video. Study material and reading material for Microbes and disease SiteMap

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Science 9th Standard Topics

Unit-1 Food
organic farming
Plant and animal breeding
Plants protection from pests and diseases
use of fertilizers manures


Unit-2 Matter Nature and Behaviour
Structure of atom
Particle nature basic units
Nature of matter
Mole Concept
Isotopes and isobars
Heterogenous and homogenous mixtures
Electrons protons and neutrons
Definition of matter solid liquid and gas
characteristics of matter
change of state of matter
Atomic and molecular masses


Unit-3 Organization in the living world.
Pulse polio programmes
Principles of treatment and prevention
Major groups of animals
Infectious and Non infectious diseases
Health and diseases
Diversity of plants and animals
Diseases caused by microbes
Cell Basic Unit of life
Biological Diversity
Unit-3-Organization-in-the-living-world




Microbes and disease


Organisms that cause disease are called pathogens. They are also parasites, living off their host, which does not benefit as a result.

There are 4 types of microbes (micro-organisms) that cause disease;
• Viruses
• Bacteria
• Fungi
• Protozoa (also known as protoctista).
Viruses are very small, and most can only be seen with an electron microscope.
They just contain a core of nucleic acid (DNA or RNA) surrounded by a covering layer of protein (no cytoplasm, cell membrane or anything else). They are not usually considered as living organisms, as they are very simple and do not carry out most of the living processes which other living organisms perform.

Viruses are not made of cells, and are sometimes referred to as virus particles or virions.

Viruses are inactive when outside of a living cell, but once their nucleic acid is inside they take over the cell's activities. Usually they make many copies of themselves inside the cell, then break out of the cell and infect others. Viruses cannot be killed by antibiotics such as penicillin.

Examples of diseases caused by viruses: flu (influenza), common cold, measles, mumps, german measles (Rubella), smallpox, cowpox, chicken pox, HIV (can lead to AIDS), rabies

Bacteria (the term bacterium is used for single one) are single celled organisms, only visible (as "dots" and "dashes") with a (good) light microscope. They are larger than viruses but smaller than ordinary cells of the human body. They contain DNA but this is not inside a structure like a nucleus. Because of these features, bacteria are placed in a separate kingdom of their own.

Some bacteria produce spores, which can be inactive for a long time and survive exposure to chemicals and heat which kill ordinary bacteria which are growing normally.

Not all bacteria cause disease; some are very useful "in nature". When bacteria infect the body, they can reproduce quite fast. Often they produce chemicals called toxins which have the actual effect which causes an illness. Bacteria can usually be killed by antibiotics such as penicillin.

Examples of diseases caused by bacteria: cholera, tuberculosis (TB), septicaemia ("blood poisoning"), anthrax.

Fungi (singular fungus) are slightly larger than bacteria, and their DNA is contained inside nuclei like plant and animal cells. Nowadays fungi are placed in a separate kingdom of their own. Many fungi consist of thread-like structures called hyphae which branch as they grow and expand to penetrate whatever they are growing on. Others like yeast are made of single oval shaped cells, and they grow by budding off new cells asexually. They are more suited to living in a liquid environment.
Once again, not all fungi cause disease; some are very useful "in nature".

Examples of diseases caused by fungi: Athlete's foot (not only caught by athletes, or confined to the foot!), ringworm (not a worm), thrush (not a bird)

Protozoa/protoctista are generally single celled organisms with true nuclei and a cell membrane, so they are quite like our body cells.

Examples of diseases caused by protozoa/protoctista: Malaria, sleeping sickness, dysentery



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Microbes and disease – Explained With Video and pictures. CBSE Class 9 grade Standard Science Microbes and disease with Video, learn by reading and watching Microbes and disease, Microbes and disease for class XIth, Easy to understand Microbes and disease, Class 9 standard video, a way to learn Microbes and disease, learn from the best, Microbes and disease explained with pictures and video. Study material and reading material for Microbes and disease