Homework Practice

Printable assignment

Final Assessment: Soil

Section A: Core Concepts

Question 1mcq

A student says, “Soil is only powdered rock.” What important part is missing from this idea?

A.Soil contains no air at all.

B.Soil is made only of rainwater.

C.Soil cannot support living things.

D.Humus and living organisms are also important parts of soil.

Question 2mcq

Which observation best shows that organic matter is helping form fertile soil?

A.Dead leaves decay and mix with the top layer.

B.A mirror reflects sunlight.

C.A magnet attracts iron filings.

D.A plastic bottle floats in water.

Question 3mcq

Assertion: Soil formation is a slow natural process. Reason: Weathering and humus formation happen gradually. Which option is correct?

A.Both are true, but the reason does not explain the assertion.

B.Both assertion and reason are true, and the reason explains the assertion.

C.The assertion is true, but the reason is false.

D.The assertion is false, but the reason is true.

Question 4mcq

Why are many plant roots found mainly in the topsoil?

A.Topsoil has no organisms.

B.Topsoil has more humus, air, water and nutrients.

C.Topsoil is always solid rock.

D.Topsoil is completely dry everywhere.

Question 5mcq

A student labels the deepest hard rock layer as topsoil. What is the error?

A.Topsoil is always below bedrock.

B.Bedrock is a type of leaf litter.

C.The deepest hard layer is bedrock, not topsoil.

D.Soil has no layers.

Question 6mcq

A soil pit shows a dark upper layer with leaf pieces and a lighter layer below it. Which label best fits the dark upper layer?

A.Subsoil only

B.Parent rock

C.Topsoil

D.Bedrock

Section B: Observations and Data

Question 7mcq

Water poured into Soil A passes through very quickly. Water poured into Soil B remains for a long time. Which comparison is likely?

A.Soil A is pure humus; Soil B is pure air.

B.Both soils must be identical.

C.Soil A is more sandy; Soil B is more clayey.

D.Soil A has smaller particles than Soil B always.

Question 8mcq

A student says, “Clayey soil has the best aeration because it has the smallest particles.” What is wrong?

A.Small particles always create large tunnels.

B.Aeration means soil colour only.

C.Clayey soil contains no water.

D.Small particles leave smaller spaces, so aeration is usually poorer.

Question 9mcq

Which soil would be least suitable for a plant that gets damaged by waterlogging?

A.Clayey soil

B.Sandy soil with good drainage

C.Loamy soil with moderate drainage

D.Soil mixed with compost and sand

Question 10mcq

Two soils receive equal water. Soil X lets water pass in

2

minutes; Soil Y takes

8

minutes. Which has slower percolation?

A.Soil X

B.Both are equal

C.Cannot be compared because time is given

D.Soil Y

Question 11mcq

Why can sandy soil dry out faster than clayey soil after rain?

A.Large spaces let water drain quickly.

B.It makes water chemically disappear.

C.It has no particles at all.

D.It always reflects rain upward.

Question 12mcq

A farmer says a soil holds water well but becomes sticky and poorly aerated. Which soil is most likely?

A.Sandy soil

B.Clayey soil

C.Gravel bed

D.Dry rock powder with no clay

Section C: Applications

Question 13mcq

Why is cotton often grown in black soil that holds moisture but does not stay flooded?

A.Cotton needs moisture, but roots also need air and drainage.

B.Cotton grows only in bedrock.

C.Cotton needs no soil water at all.

D.Cotton plants absorb food only from stones.

Question 14mcq

A field has very sandy soil and dries quickly. Which practice would best improve crop growth?

A.Remove all humus from the field.

B.Add compost or organic matter to improve water retention.

C.Make the soil more exposed to wind.

D.Stop all irrigation forever.

Question 15mcq

A student chooses clayey soil for cactus because it stores more water. What is the flaw?

A.Cactus cannot grow in any soil.

B.Clayey soil never contains water.

C.Cactus needs well-drained soil; too much retained water can harm it.

D.Drainage is unrelated to plants.

Question 16mcq

A field loses its dark top layer after heavy rain every year. What is the likely effect on crops?

A.Crop growth must improve because humus is removed.

B.The field becomes pure oxygen.

C.Soil fertility may decrease because nutrient-rich topsoil is lost.

D.Plants no longer need roots.

Question 17mcq

Assertion: Covering soil with plants can reduce erosion. Reason: Plant roots help bind soil particles. Which option is correct?

A.Both are true, but the reason does not explain the assertion.

B.The assertion is true, but the reason is false.

C.Both assertion and reason are false.

D.Both assertion and reason are true, and the reason explains the assertion.

Question 18mcq

Which situation is most likely to cause the fastest loss of topsoil during heavy rain?

A.A grass-covered slope with roots

B.A field with contour bunds

C.A garden covered with mulch

D.A steep bare slope with no plants

Section D: Reasoning Challenge

Question 19mcq

Why is soil with more humus generally more fertile?

A.Humus prevents all organisms from living.

B.Humus makes soil completely waterproof.

C.Humus adds nutrients and improves soil structure.

D.Humus is the same as plastic.

Question 20mcq

A farmer burns all crop remains every season and adds no compost. Which soil component may decrease over time?

A.Bedrock depth instantly

B.Latitude

C.Wind direction

D.Humus

Question 21mcq

A student says microbes in soil are useless because they are too small to see. What is the best correction?

A.Microbes decompose organic matter and help form humus.

B.Only visible organisms affect soil.

C.Microbes make soil unable to support plants.

D.Microbes are weather instruments.

Question 22mcq

Soil A: high water retention, poor aeration. Soil B: fast drainage, low retention. Which conclusion is best?

A.A is sandy and B is clayey.

B.Both are identical because both are soils.

C.Neither soil can be compared using water data.

D.A is more clayey and B is more sandy.

Question 23mcq

Which evidence best supports choosing loamy soil for a vegetable garden?

A.It holds enough water, drains excess water and contains humus.

B.It is only made of large stones.

C.It never lets roots enter.

D.It contains no air spaces.

Question 24mcq

A village has frequent dust storms after removing trees around farms. Which solution directly addresses the cause?

A.Paint the soil red.

B.Plant windbreaks and restore vegetation.

C.Measure temperature only.

D.Remove remaining grass from the fields.