Question

Bacteria are both harmful and useful. Justify the statement by giving two ways
how they are useful and two ways how they are harmful.

Answer 1

Question

Bacteria are both harmful and useful. Justify the statement by giving two ways how they are useful and two ways how they are harmful.

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Answer

Bacteria is a microbe, also known as microorganism, and can be seen under only a microscope. It is useful and harmful in its own ways. Let's discuss how they can be useful to us as well as how they can be harmful to us.

Uses of Bacteria →

• They act like decomposers and feed upon the dead and decaying components in the environment. They also help in releasing nutrients in the soil, air, etc.
• Some of the nitrogen-fixing bacteria help in the nitrogen fixation of plants that helps in fertiling the soil.
• They can be helpful in the manufacturing of antibodies.
• They help in the production of certain products like alcohol, vinegar, etc.
• Some bacteria help in the baking field. They help in the making of breads, cakes, etc.

Harmful Effects of Bacteria →

• Some bacteria can result in food poisoning by adding toxic substances to the food.
• Some bacterias led to spoilage of food, paper, clothes, etc.
• Some bacterias pollute the water and make it unfit for usage and drinking.
• Some bacterias can cause bacterial infections and diseases.

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Answer 2

Answer:

★ Bacteria :-

➠ Bacteria are microscopic organisms found everywhere. They are the simplest form of living organisms have only one cells.

➠ The role of bacteria is to act as decomposers. They break down chemical inside other organisms. Germs are bacteria.

★ Some uses of bacteria :-

Bacteria are uses in many ways :

● Medicines :

• Antibiotics are responsible for destroying disease cause germs in body.
• Streptomycin : Used to treat human disease is prepared using bacteria.

● Curdling of Milk :

• It carried out using Lactobacillus bacteria.
• Bacteria convert lactose into lactic acid making curd sour in taste.

● Tanning of Leather :

• Types of bacteria are used in curing of animal hides and skins.

★ Some harmful effects of bacteria :

Bacteria can be harmful in many ways :

● Harmful bacteria formed as pathogens.

● They live in the bodies of the host organisms cause disease by producing waste toxin.

● They pollute water like vibro-cholera.

● Spoilage of food like e-coli.

● They also cause disease in plant like stalk-rot of maize.