Which of the following statements are correct for "Dryland agriculture"?

(A) Growing season in dryland agriculture is < 300 days.
(B) Rainfall should be < 1800 mm.
(C) Main constraints are wind and water erosion.
(D) Growing regions are mainly humid and tropical as well as uplands.

Choose the correct answer from the options given below:

Question

Which of the following statements is false?

Answer 1

This question tests the basic climatic and constraint profile that defines dryland agriculture as a farming system.

(A) Growing season < 300 days: The real growing season in dryland tracts is short, usually under 200 days because rain runs out early. Since that true figure is still less than 300, the statement as worded stays correct.
(B) Rainfall < 1800 mm: Dryland regions are marked by scanty rain, generally under about 1150 mm a year. An 1800 mm ceiling is far too generous and does not describe dryland conditions, so this is wrong.
(C) Wind and water erosion as main constraints: Bare, loose soil combined with strong winds in arid tracts and sudden intense showers in semi-arid tracts make both forms of erosion the chief soil loss problems here, so this is correct.
(D) Humid and tropical uplands: Dryland agriculture is practiced in arid and semi-arid areas, the reverse of humid tropical conditions, so this statement is false.

Only statements (A) and (C) hold up, so the correct combination is (A) and (C) only.

Let's summarize:

Dryland agriculture means short growing seasons and low, erratic rainfall, not humid tropical uplands.
Wind and water erosion are the defining soil hazards of these regions.

The final answer is option 2.

Answer 2

This question tests the basic climatic and constraint profile that defines dryland agriculture as a farming system.

(A) Growing season < 300 days: The real growing season in dryland tracts is short, usually under 200 days because rain runs out early. Since that true figure is still less than 300, the statement as worded stays correct.
(B) Rainfall < 1800 mm: Dryland regions are marked by scanty rain, generally under about 1150 mm a year. An 1800 mm ceiling is far too generous and does not describe dryland conditions, so this is wrong.
(C) Wind and water erosion as main constraints: Bare, loose soil combined with strong winds in arid tracts and sudden intense showers in semi-arid tracts make both forms of erosion the chief soil loss problems here, so this is correct.
(D) Humid and tropical uplands: Dryland agriculture is practiced in arid and semi-arid areas, the reverse of humid tropical conditions, so this statement is false.

Only statements (A) and (C) hold up, so the correct combination is (A) and (C) only.

Let's summarize:

Dryland agriculture means short growing seasons and low, erratic rainfall, not humid tropical uplands.
Wind and water erosion are the defining soil hazards of these regions.

The final answer is option 2.

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