Science, asked by student21875, 7 months ago

some important question and answer of science for class 8​

Answers

Answered by sarakhan138
1

Answer:

branches of biology

zoology

botany

microbiology

cell biology

physiology

taxonomy

genetics

etc.

Answered by samiaiman343
1

Answer:

1.Crop Production and Management:

Question 1.

What is the name of the undesirable plants that grow among the crops?

Answer:

Weeds

Question 2.

Name one weed.

Answer:

Wild oat

Question 3.

Name the methods applied for weeding.

Answer:

Manual methodChemical methodBiological method

2.Microorganisms:

Question 1.

Name the groups in which microorganisms are broadly classified.

Answer:

Microorganisms are broadly classified in four groups:

bacteriafungiprotozoa algae

Question 2.

Name the type of microorganism that is smaller than bacteria.

Answer:

Virus

Question 3.

Write the name of a bacterium that helps in the formation of curd.

Answer:

Lactobacillus

3.Synthetic Fibres and Plastics:

Question 1.

Name a natural fibre.

Answer:

Cotton

Question 2.

Name the basic component of animal fibres.

Answer:

Protein

Question 3.

Name some artificial fibres.

Answer:

Nylon, terylene, PET, acrylic, teflon, etc.

4.Materials: Metals and Non-Metals:

Question 1.

Name some common metals.

Answer:

Copper, aluminium, iron, silver, gold, etc.

Question 2.

Name some common non-metals.

Answer:

Hydrogen, oxygen, carbon, sulphur, phosphorus, etc.

Question 3.

Give examples of metalloids.

Answer:

Antimony, arsenic, silicon, boron, etc.

5.Coal and Petroleum:

Question 1.

Name some renewable sources of energy.

Answer:

Water, wind, solar.

Question 2.

Give some examples of fossil fuels.

Answer:

Coal, petroleum, natural gas.

Question 3.

Name the elements present in coal.

Answer:

Carbon, oxygen and sulphur.

Hope it will help you...........

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