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Question (41)

QN0037461

Red soil in the Deccan region gets its reddish colour mainly because of:

(A) High humus content
(B) Diffusion of iron in crystalline and metamorphic rocks
(C) High salt concentration
(D) Excessive calcium carbonate

Correct Answer: B

Explanation:

The reddish colour of red soil is due to diffusion of iron in crystalline and metamorphic rocks.

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Question (42)

QN0037462

A soil is found in a tropical region with alternate wet and dry seasons and develops through intense leaching caused by heavy rainfall. Which soil is this?

(A) Black soil
(B) Alluvial soil
(C) Laterite soil
(D) Arid soil

Correct Answer: C

Explanation:

Laterite soil develops under tropical and subtropical conditions with alternate wet and dry seasons and intense leaching due to heavy rain.

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Question (43)

QN0037463

A farmer in a laterite-soil region adopts suitable soil-conservation methods and wants to grow tea and coffee. Which region is specifically associated with this possibility?

(A) Hilly areas of Karnataka, Kerala and Tamil Nadu
(B) Punjab and Haryana
(C) Western Rajasthan only
(D) Northern plains only

Correct Answer: A

Explanation:

With suitable conservation techniques, laterite soil in the hilly areas of Karnataka, Kerala and Tamil Nadu can support tea and coffee.

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Question (44)

QN0037464

A soil is sandy, saline, poor in humus and moisture, and contains a kankar layer in its lower horizons. Which soil is being described?

(A) Forest soil
(B) Arid soil
(C) Black soil
(D) Alluvial soil

Correct Answer: B

Explanation:

Arid soils are generally sandy and saline, lack humus and moisture, and have kankar in their lower horizons.

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Question (45)

QN0037465

An arid region has adequate irrigation introduced into its sandy, saline soils. What change does the chapter suggest can occur?

(A) The soils necessarily become laterite
(B) The soils can become cultivable
(C) The soils lose all calcium
(D) Cultivation becomes impossible

Correct Answer: B

Explanation:

With proper irrigation, arid soils can become cultivable, as seen in western Rajasthan.

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Question (46)

QN0037466

In a hilly region, heavy rainfall causes the removal of the upper soil layer over a large area in the form of a sheet. This process is called:

(A) Gully erosion
(B) Sheet erosion
(C) Wind erosion
(D) Contour erosion

Correct Answer: B

Explanation:

When water flows as a sheet over large areas and washes away the topsoil, it is called sheet erosion.

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Question (47)

QN0037467

A farmer ploughs a steep slope straight up and down. During rainfall, water rapidly flows through the channels created by the ploughing. Which change would reduce erosion?

(A) Ploughing more deeply up and down
(B) Ploughing along contour lines
(C) Removing vegetation
(D) Increasing slope length

Correct Answer: B

Explanation:

Contour ploughing decelerates the flow of water down slopes and reduces soil erosion.

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Question (48)

QN0037468

A hilly farming region constructs step-like fields across slopes. Which combination correctly identifies the method and its effect?

(A) Strip cropping — increases water speed
(B) Terrace cultivation — restricts erosion
(C) Shelter belts — increases runoff
(D) Gully farming — removes topsoil

Correct Answer: B

Explanation:

Terrace cultivation involves cutting steps into slopes and helps restrict soil erosion.

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Question (49)

QN0037469

A dry region has strong winds that remove loose soil from agricultural fields. Farmers leave strips of grass between crop fields. Why?

(A) To increase wind speed
(B) To break the force of wind and reduce soil erosion
(C) To increase salinity
(D) To increase mining activity

Correct Answer: B

Explanation:

Leaving strips of grass between crops breaks the force of wind and reduces soil erosion. This method is called strip cropping.

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Question (50)

QN0037470

A desert-margin region plants rows of trees to reduce the force of prevailing winds. Over time, sand dunes become more stable. Which method is being used?

(A) Contour ploughing
(B) Terrace cultivation
(C) Shelter belts
(D) Gully plugging

Correct Answer: C

Explanation:

Rows of trees called shelter belts reduce wind force and help stabilise sand dunes in western India.

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Question (41)

Red soil in the Deccan region gets its reddish colour mainly because of:

Explanation:

Link:

Question (42)

A soil is found in a tropical region with alternate wet and dry seasons and develops through intense leaching caused by heavy rainfall. Which soil is this?

Explanation:

Link:

Question (43)

A farmer in a laterite-soil region adopts suitable soil-conservation methods and wants to grow tea and coffee. Which region is specifically associated with this possibility?

Explanation:

Link:

Question (44)

A soil is sandy, saline, poor in humus and moisture, and contains a kankar layer in its lower horizons. Which soil is being described?

Explanation:

Link:

Question (45)

An arid region has adequate irrigation introduced into its sandy, saline soils. What change does the chapter suggest can occur?

Explanation:

Link:

Question (46)

In a hilly region, heavy rainfall causes the removal of the upper soil layer over a large area in the form of a sheet. This process is called:

Explanation:

Link:

Question (47)

A farmer ploughs a steep slope straight up and down. During rainfall, water rapidly flows through the channels created by the ploughing. Which change would reduce erosion?

Explanation:

Link:

Question (48)

A hilly farming region constructs step-like fields across slopes. Which combination correctly identifies the method and its effect?

Explanation:

Link:

Question (49)

A dry region has strong winds that remove loose soil from agricultural fields. Farmers leave strips of grass between crop fields. Why?

Explanation:

Link:

Question (50)

A desert-margin region plants rows of trees to reduce the force of prevailing winds. Over time, sand dunes become more stable. Which method is being used?

Explanation:

Link:

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