Ch – 9 Soil

Important Notes:

Q.1: The breaking down of rocks by the action of wind, water and climate is known as ____________.

Ans: weathering

Q.2: The nature of the soil depends upon the _________ from which it has been formed and the types of ________ that grows in it.

Ans: rock, vegetation

Q.3: The rotting dead matter in the soil is known as ___________.

Ans: humus

Q.4: A vertical section through different layers of the soil is called ______________.

Ans: soil profile

Q.5: Each horizon of soil differs in ___________, ___________ and ___________.

Ans: colour, depth and chemical composition

Q.6: The ___________ horizon is generally dark in colour as it is rich in humus.

Ans: uppermost

Q.7: The ___________ makes the soil fertile and provide nutrients to growing plants.

Ans: humus

Q.8: _____________ layer is generally more soft, porous and can retain more water.

Ans: topsoil or A-horizon

Q.9: __________ layer provides shelter to many living organisms.

Ans: topsoil or A-horizon

Q.10: ____________ layer has lesser amount of humus and more of minerals.

Ans: B-horizon or middle

Q.11: _____________ is made up of small lumps of rocks with cracks and crevices.

Ans: C-horizon

Q.12: ___________ is hard and difficult to dig with a spade.

Ans: bedrock

Q.13: The mixture of rock particles and humus is called ___________.

Ans: soil

Q.14: If soil contains larger proportion of bigger particles, it is called _____________.

Ans: sandy soil

Q.15: If the proportion of fine particles is relatively higher, then it is called _____________.

Ans: clayey soil

Q.16: If the amount of large and fine particles is about the same, then the soil is ______________.

Ans: loamy soil

Q.17: ____________ soil tend to be well-aerated, light and rather dry.

Ans: sandy

Q.18: The best topsoil for growing plants is _________.

Ans: loamy soil

Q.19: The size of ________ particles is between those of sand and clay.

Ans: silt

Q.20: Soil is affected by _________, ___________, ___________, ____________ and ______________.

Ans: wind, rainfall, temperature, light and humidity

Q.21: The ___________ and _______________ determine the various types of vegetation and crops that might grow in any region.

Ans: climatic factors, components of soil

Q.22: Clayey and loamy soils are both suitable for growing _________ and ________.

Ans: cereals, gram

Q.23: For paddy, soils rich in _______ and ____________ and having good capacity to retain water are ideal.

Ans: clay, organic matter

Q.24: For lentils and pulses, ___________ soils are required.

Ans: loamy

Q.25: Crops such as wheat are grown in ____________ soil.

Ans: fine clayey

Q.26: Cotton is grown in ______________ soil.

Ans: sandy-loam or loam

Q.27: The removal of land surface by water, wind or ice is known as _____________.

Ans: erosion

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

3 thoughts on “Ch – 9 Soil

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