36. The bark of which plant is used to make medicine for malaria?
(A) Neem
(B) Cinchona
(C) Sal
(D) Jamun
Answer:
(B) Cinchona
Explanation:
The bark of the Cinchona tree contains quinine, a potent alkaloid compound that was historically the primary medical treatment for malaria.
37. Anaemia is caused due to deficiency of
(A) iodine
(B) zinc
(C) calcium
(D) Iron
Answer:
(D) Iron
Explanation:
Iron is a vital component necessary for the production of hemoglobin. A lack of dietary iron leads to an inadequate amount of red blood cells, a condition known as Iron-deficiency anemia.
38. Which of the following disease is not spread by mosquitoes?
(A) Marasmus
(B) Dengue
(C) Chikungunya
(D) Malaria
Answer:
(A) Marasmus
Explanation:
Dengue, Chikungunya, and Malaria are all transmitted via mosquito bites. Marasmus is a severe form of malnutrition caused by severe deficiency in all nutrients, entirely unrelated to insects.
39. Which of the following is soluble in water?
(A) Chalk Powder
(B) Lumps of Sugar
(C) Soil
(D) Talcum Powder
Answer:
(B) Lumps of Sugar
Explanation:
Sugar (sucrose) readily dissolves in water forming a uniform solution. Chalk, soil, and talcum powder are insoluble and will eventually settle as sediment.
40. Wet clothes dry up because of
(A) Condensation
(B) Evaporation
(C) Transpiration
(D) Precipitation
Answer:
(B) Evaporation
Explanation:
Heat from the sun or ambient air provides energy to the water molecules in wet clothes, causing them to turn from liquid to vapor and escape into the air through the process of evaporation.
