2121. In animals excess of nitrogen is excreted primarily in form of___________?
✅ D. Ammonia
Option A: Creatinine Option B: Trimethyamine oxide Option C: Pyrimidine Option D: Ammonia Correct Answer : Ammonia Read more
Author: Sheeraz Ahmed – Page 107
2122. Hydra has no specialized excretory system because:
✅ C. The whole body cells are in contact with water
Option A: It does not produce waste material Option B: Due to absence of mesoderm Option C: The whole body cells are in contact with water Option D: It has pseudocoelom. Correct Answer : The whole body cells are in contact with water Read more
2123. The distal blind end of the malpighian tubules bathes freely in____________?
✅ C. Haemocoel
Option A: Digestive tract Option B: Intestines Option C: Haemocoel Option D: Coelom Correct Answer : Haemocoel Read more
2124. It has been estimated that in a normal person plasma constitutes about ________ by volume of blood.
✅ C. 55%
Option A: 35% Option B: 45% Option C: 55% Option D: 75% Correct Answer : 55% Read more
2125. Brown fat present in certain mammals is specialized in___________?
✅ C. Rapid heat production.
Option A: Providing insulation in cold environment. Option B: Providing insulation in hot environment Option C: Rapid heat production. Option D: Controlling heat production. Correct Answer : Rapid heat production. Read more
2126. Panting is a representative of which mechanism?
✅ C. Evaporative cooling.
Option A: Pigmentation. Option B: Respiration. Option C: Evaporative cooling. Option D: Excretion. Correct Answer : Evaporative cooling. Read more
2127. Formation of heat shock proteins in plants results in___________?
✅ B. Embracing the enzymes and other proteins and prevent their denaturation.
Option A: Elevation of temperature in cold conditions. Option B: Embracing the enzymes and other proteins and prevent their denaturation. Option C: Change the chemical nature of other proteins thus making them heat resistant. Option D: Help in evaporative cooling. Correct Answer : Embracing the enzymes and other proteins and prevent their denaturation. Read more
2128. Fishes, most of the invertebrates and amphibians are examples of ________ animals?
✅ B. Ectotherms
Option A: Endotherms Option B: Ectotherms Option C: Heterotherms Option D: Homeotherms Correct Answer : Ectotherms Read more
2129. The mechanism of regulation, generally between organism and its environment, of solutes and the gain and the loss of water is called________?
✅ C. Osmoregualtion
Option A: Homeostasis Option B: Hemostasis Option C: Osmoregualtion Option D: Thermoregulation Correct Answer : Osmoregualtion Read more
2130. Which of the following represents osmoregulatory steps taken by hydrophytes?
✅ A. Increases transpiration by increasing the surface area of the leav
Option A: Increases transpiration by increasing the surface area of the leav Option B: Small and thick leaves to decrease the surface area proportional to the volume of the leav Option C: Stomata closing in sufficient supply, and opening in restricted supply of water. Option D: None of these Correct Answer : Increases transpiration by increasing the surface area of… Read more