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Geography Complete the concpt charts.

Soils · Maharashtra Board STD 7 (MSBSHSE - English Medium). 2 questions.

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Complete the concpt charts.

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Question 13 Marks
Factor/ProcessRole in the formation of soil
(1) Parent rock…………….
(2) Regional climate……………
(3) Organic material…………..
(4) Micro­organisms……………..
Answer
Factor/ProcessRole in the formation of soil
(1) Parent rockThe rock gets weathered depending on the hardness of the rock and the climate of the region. It turns into powdery material which further turns into soil.
(2) Regional climateWhen the rock is exposed to a different climates, the same type of rock gives rise to different types of soil.
(3) Organic materialThe organic material gets mixed into weathered powdery material and turn it into soil.
(4) Micro­organismsMicroorganisms help in decomposing the dead remains of organic materials and get mixed into the soil to form humus.
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Question 23 Marks
ActionEffectResult (W.R.T. fertility)
Construction of embankments.
Wind speed decreased.
Farm land is kept fallow for some period.Helps to maintain the pH balance and increase the proportion of humus.Increases the fertility of soil.
Regular use of organic manures, vermicompost and compost.
Check the velocity of water running along the slopes.
Litter is burnt in the farm.
Decomposed vegetal litters, roots of plants and remains of animals.
Salt content in the soil increases.
Leads to the lowering of humus content in the soil.
Answer
ActionEffectResult (W.R.T. fertility)
Construction of embankments.Protects soil from being washed away.Protects fertility of soil.
Planting trees.Wind speed decreased.Protects fertility of soil
Farm land is kept fallow for some period.Helps to maintain the pH balance and increase the proportion of humus.Increases the fertility of soil.
Regular use of organic manures, vermicompost[1] and compost.Humus content increased.Increases the fertility of soil.
Trenches are dug across a slope.Check the velocity of water running along the slopes.Protects fertility of soil
Litter is burnt in the farm.Decreases the amount of organic material in soil.Decreases the fertility of soil.
Decomposed vegetal litters, roots of plants and remains of animals.Proves favourable for micro organism.Increases the fertility of soil.
Excessive IrrigationSalt content in the soil increases.Decreases the fertility of soil
Chemical fertilizers used excessively.Leads to the lowering of humus content in the soil.Decreases the fertility of soil
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Complete the concpt charts. - Geography STD 7 Questions - Vidyadip