Complete the following table. Name of disease Causative agent Animals affected Poultry Bacteria Virus Sheep, deer, goats and cattle Distemper Fowl pox

Name of disease Causative agent Animals affected Bird flu Virus Poultry Tuberculosis Bacteria Humans Foot and mouth disease Virus Sheep, deer, goats and cattle Distemper Virus Dogs and cats Fowlpox Virus Chicken and turkey The microorganisms such as virus, bacteria, protozoa, fungi etc. cause various diseases in plants and animals. They harm the animals as well as their products such as milk, wool, egg and many more. When the products of infected animals are consumed by man, it causes adverse effects and causes many disorders.

Complete the following table. Plant disease Name of plant/s affected Causative agent Mode of transmission Black stem rust Fungus Wind, water Orange, lemon Bacteria Tobacco

Plant disease Name of plant/s affected Causative agent Mode of transmission Black stem rust Wheat, rye and other grasses Fungus Wind, water Wheat and corn smut Wheat and corn Fungus Wind, water Citrus canker Orange, lemon Bacteria Stomata, open wounds Tobacco mosaic Tobacco Virus Direct contact The microorganisms such as fungi, bacteria and viruses cause harmful diseases in the plants. They affect the plant body and also their products. When plants are infected with diseases, the yield will be decreased and the quality of the products obtained from the plants are also affected.

MEDIUM

8th CBSE

IMPORTANT

Earn 100

Describe the nitrogen cycle in nature.

Important Questions on Microorganisms—Friends and Foes

MEDIUM

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 5

Why should we be cautious in taking antibiotics? Mention the precautions that need to be taken while taking antibiotics.

MEDIUM

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 6

Give reasons for the following.
It is important to drink clean water but it is equally important to have clean water for cleaning the utensils.

MEDIUM

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 6

Give reasons for the following.
As many children in the neighbourhood were suffering from dengue, the teacher advised the students to wear full-sleeved shirts and trousers even though it was time to wear summer uniform. Why?

MEDIUM

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 6

Give reasons for the following.
The earth would be one big mound of rubbish if there were no bacteria and fungi. Why?

MEDIUM

8th CBSE

IMPORTANT

Galaxy A Course in Science Book 8>Chapter 2 - Microorganisms—Friends and Foes>Put on your thinking cap>Q 7

Rajat was feeling unwell and the doctor did some tests to know what Rajat was suffering from and also gave him some antibiotics. Put a tick on the disease(s) which can be treated with antibiotics.

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