Ploughing (or tilling) is the physical, mechanical agricultural process used to turn, break up, and loosen compact topsoil to allow better root penetration and aeration before planting seeds.
47. Snakes hear through
(A) Vibration
(B) Smell
(C) Sound
(D) Earth
Answer:
(A) Vibration
Explanation:
Because snakes lack external ears and eardrums, they “hear” by detecting low-frequency ground vibrations, which travel through their lower jawbone directly into their inner ear structures.
48. When we go up into the sky, the atmospheric pressure will-
(A) Increase
(B) decrease
(C) Remain same
(D) none of these
Answer:
(B) decrease
Explanation:
Atmospheric pressure is essentially the weight of the air above you. As you gain altitude, there is physically less air above pushing down, causing the pressure to steadily decrease.
49. The revolution of Earth causes
(A) Days and nights
(B) Seasons
(C) Natural disasters
(D) Thunder and lighting
Answer:
(B) Seasons
Explanation:
The Earth revolves around the Sun over the course of a year. Because the Earth is tilted on its axis, this revolution changes how direct sunlight strikes different hemispheres, thereby causing the seasons.
50. Dust storms are common in
(A) Mountain
(B) Plains
(C) Deserts
(D) Coastal area
Answer:
(C) Deserts
Explanation:
Deserts are arid regions characterized by dry, loose sand and very little stabilizing vegetation. Strong weather fronts passing over these areas can easily lift the top layer of sand into the air, creating massive dust storms.
