Science Questions - Class 8

Question 1

What led to the development of agriculture around 10,000 B.C.E.?

Accepted Answer

The transition from nomadic lifestyle to settled cultivation of land

Answer

People became tired of hunting

Answer

Tools became more advanced

Answer

Population decreased significantly

Question 2

What is the definition of a crop?

Accepted Answer

Plants of the same kind cultivated at one place on a large scale

Answer

Any plant that grows in soil

Answer

All vegetables grown in a garden

Answer

Wild plants that grow naturally

Question 3

Which of the following are Kharif crops?

Accepted Answer

Paddy, maize, cotton

Answer

Wheat, gram, pea

Answer

Mustard, linseed, barley

Answer

All of the above

Question 4

Why is paddy not grown in the winter season?

Accepted Answer

Paddy requires a lot of water, which is available during the rainy season

Answer

Winter is too cold for paddy

Answer

Soil is not suitable in winter

Answer

Seeds don't germinate in winter

Question 5

What is the process of loosening and turning the soil called?

Accepted Answer

Tilling or ploughing

Answer

Harvesting

Answer

Sowing

Answer

Irrigation

Question 6

Why does loosening of soil help roots breathe easily?

Accepted Answer

It provides more space for air circulation

Answer

It removes harmful gases

Answer

It increases soil temperature

Answer

It reduces water content

Question 7

What is the main component of a traditional plough that cuts through the soil?

Accepted Answer

Ploughshare

Answer

Ploughshaft

Answer

Beam

Answer

Handle

Question 8

In the seed viability test using water, what happens to damaged seeds?

Accepted Answer

They float on top because they are lighter/hollow

Answer

They sink to the bottom

Answer

They dissolve in water

Answer

They change color

Question 9

What are the advantages of using a seed drill over traditional sowing methods?

Accepted Answer

Sows seeds uniformly, saves time and labor, and protects seeds from birds

Answer

Only saves time

Answer

Only ensures uniform spacing

Answer

Only protects from birds

Question 10

What is manure?

Accepted Answer

An organic substance obtained from decomposition of plant or animal wastes

Answer

A chemical fertilizer

Answer

A type of pesticide

Answer

A soil additive that prevents weeds

Question 11

Which of the following is NOT an advantage of manure over fertilizers?

Accepted Answer

Provides immediate nutrient availability

Answer

Enhances water holding capacity

Answer

Makes soil porous

Answer

Increases friendly microorganisms

Question 12

What percentage of water do plants contain?

Accepted Answer

Nearly 90%

Answer

Nearly 70%

Answer

Nearly 80%

Answer

Nearly 95%

Question 13

Why is irrigation frequency higher in summer?

Accepted Answer

Due to increased rate of evaporation of water from soil and leaves

Answer

Plants grow faster in summer

Answer

Summer crops need more water

Answer

Soil becomes harder in summer

Question 14

Which irrigation method is most suitable for water-scarce regions?

Accepted Answer

Drip irrigation

Answer

Sprinkler system

Answer

Flood irrigation

Answer

Furrow irrigation

Question 15

What are weeds?

Accepted Answer

Undesirable plants growing naturally along with crop plants

Answer

Useful plants grown with crops

Answer

Plants that help crop growth

Answer

Decorative plants in fields

Question 16

When is the best time for removal of weeds?

Accepted Answer

Before they produce flowers and seeds

Answer

After they produce seeds

Answer

During flowering

Answer

Any time during crop growth

Question 17

What safety precaution should farmers take when spraying weedicides?

Accepted Answer

Cover nose and mouth with cloth

Answer

Spray during rain

Answer

Spray during strong winds

Answer

Use maximum concentration

Question 18

How long does it usually take for a cereal crop to mature?

Accepted Answer

3 to 4 months

Answer

1 to 2 months

Answer

2 to 3 months

Answer

5 to 6 months

Question 19

What is threshing?

Accepted Answer

Separating grain seeds from chaff

Answer

Cutting the mature crop

Answer

Removing weeds from field

Answer

Watering the crops

Question 20

What is a combine machine?

Accepted Answer

A machine that both harvests and threshes

Answer

Only a harvester

Answer

Only a thresher

Answer

A machine for sowing seeds

Science Class 8

Chapter 1

Chapter 2

Chapter 3

Chapter 4

Chapter 6

Chapter 7

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