Soil erosion is the geological process wherein the fertile top layer of soil is stripped away and displaced, most commonly driven by the physical forces of wind and flowing water.
37. ______ is caused by the deficiency of vitamins A.
(A) Night blindness
(B) Beri-Beri
(C) Scurvy
(D) Goitre
Answer:
(A) Night blindness
Explanation:
Vitamin A is a vital nutrient for maintaining a clear cornea and functioning retinas. A severe deficiency directly results in night blindness, making it difficult or impossible to see in low light.
38. Unwanted plants grow with crops and compete for nutrients.
(A) Weed
(B) Stalk
(C) Compost
(D) pest
Answer:
(A) Weed
Explanation:
Weeds are invasive, wild plants that establish themselves in agricultural fields, competing aggressively with intended crops for essential sunlight, space, and soil nutrients.
39. Ozone layer protect us from
(A) Laser rays
(B) Cosmic rays
(C) UV rays
(D) all of these
Answer:
(C) UV rays
Explanation:
The ozone layer, located in the stratosphere, acts as an atmospheric shield that absorbs the vast majority of the Sun’s harmful, high-frequency ultraviolet (UV) radiation.
40. Which scale is used to measure the intensity of Earthquake ?
(A) Ruler scale
(B) Richter scale
(C) Barometer scale
(D) Odometer
Answer:
(B) Richter scale
Explanation:
The Richter scale is a quantitative, logarithmic measurement tool developed to calculate and express the magnitude (the energy released) of seismic waves generated by an earthquake.
