221. Bats & humming birds belong to___________?
✅ C. Heterotherms
Option A: Endotherms Option B: Ectotherms Option C: Heterotherms Option D: Homeotherms Correct Answer : Heterotherms Read more
Biology MCQs – Page 12
222. Thick, waxy & leathery cuticle around leaves is present in___________?
✅ C. Xerophytes
Option A: Hydrophytes Option B: Mesophytes Option C: Xerophytes Option D: Halophytes Correct Answer : Xerophytes Read more
223. Which of the following animal excrete nitrogenous waste mainly as uric acid?
✅ D. Birds.
Option A: Hydra Option B: Planaria. Option C: Humans Option D: Birds. Correct Answer : Birds. Read more
224. Which of the following openings have cilia?
✅ A. Nephrostome
Option A: Nephrostome Option B: Nephridiopore Option C: Both of these Option D: None of these Correct Answer : Nephrostome Read more
225. In osmosis water molecules move from area of _____________ through semipermeable memberane?
✅ B. Lower solute concentration to higher solute concentration
Option A: Higher solute concentration to lower solute concentration Option B: Lower solute concentration to higher solute concentration Option C: Lower solvent concentration to higher solvent concentration Option D: All of these Correct Answer : Lower solute concentration to higher solute concentration Read more
226. Which of the following is most toxic?
✅ A. Ammonia
Option A: Ammonia Option B: Urea Option C: Uric acid Option D: Trimethylamine oxide Correct Answer : Ammonia Read more
227. In Urea cycle __________ ammonia molecules combine with 1 CO2 molecule to form 1 molecule of urea.
✅ B. 2
Option A: 1 Option B: 2 Option C: 3 Option D: 4 Correct Answer : 2 Read more
228. Which adaptation is acquired by plants of cooler areas to prevent lipid crystal formation in cell membrane?
✅ C. Increase in proportion of unsaturated fatty acids.
Option A: Change in membrane protein composition. Option B: Change in the solute composition of the cell membrane which prevents crystallization. Option C: Increase in proportion of unsaturated fatty acids. Option D: Development of heat shock proteins. Correct Answer : Increase in proportion of unsaturated fatty acids. Read more
229. Which of the following statement about Homeostasis is incorrect?
✅ B. Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment
Option A: There is a definite control system that regulates the homeostatic activities Option B: Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment Option C: Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment Option D: All are correct Correct Answer : Homeostatic… Read more
230. Which of the following fish drink large amount of sea water and excrete concentrated urine resulting in maximum salt excretion and minimal water loss?
✅ C. Bony fishes
Option A: Hagfish Option B: Fresh water fishes Option C: Bony fishes Option D: None of these Correct Answer : Bony fishes Read more
231. Normal body temperature in mamals like human beings is____________?
✅ B. 36 38°C
Option A: 26 28°C Option B: 36 38°C Option C: 46 48°C Option D: 56 58°C Correct Answer : 36 38°C Read more
232. Thermostat of human body is present in__________?
✅ D. Hypothalamus
Option A: Fore brain Option B: Hind Brain Option C: Thalamus Option D: Hypothalamus Correct Answer : Hypothalamus Read more
233. Which of the following structure in plants body is called excretophores?
✅ B. Leaves
Option A: Stem Option B: Leaves Option C: Flowers Option D: Roots Correct Answer : Leaves Read more
234. The characteristic which enable animals to tolerate dehydration is called__________?
✅ C. Anhydrobiosis
Option A: Osmoconformation Option B: Osmoregulaton Option C: Anhydrobiosis Option D: Anhydrosis Correct Answer : Anhydrobiosis Read more
235. Which of the following fishes excrete large volume of diluted urine?
✅ B. Fresh water fishes
Option A: Bony Marine fishes Option B: Fresh water fishes Option C: Both depending upon the surrounding water Option D: None of these Correct Answer : Fresh water fishes Read more
236. Rose is an example of____________?
✅ B. Mesophytes
Option A: Hydrophytes Option B: Mesophytes Option C: Xerophytes Option D: Halophytes Correct Answer : Mesophytes Read more
237. In a hot summer after noon, if your bodys Homeostatic machinery keep your internal temperature quite lower than that of external than this is an example of____________?
✅ B. Negative feed back
Option A: Positive feed back Option B: Negative feed back Option C: Feed back Option D: Osmoregulation Correct Answer : Negative feed back Read more
238. Marine fish can keep their internal environment hypertonic with respect to the surrounding salty water by retaining.
✅ D. Trimethylamine oxide
Option A: Excessive urea which will increase their internal solute concentration and prevent body shrinkage in hypertonic environment Option B: Trimethyl alanine Option C: Ammonia Option D: Trimethylamine oxide Correct Answer : Trimethylamine oxide Read more
239. Terrestrial animals like kangaroo rat survive even without drinking water since__________?
✅ D. They are anhydrobiotic organisms
Option A: They dont require water for their metabolic process Option B: They can retain excessive water in their body during raining season. Option C: They feed on carbohydrate rich seeds which can provide them with metabolic water Option D: They are anhydrobiotic organisms Correct Answer : They are anhydrobiotic organisms Read more
240. Aquatic animals excrete nitrogenous waste commonly in the form of_____________?
✅ A. Ammonia
Option A: Ammonia Option B: Urea Option C: Uric acid Option D: Trimethylamine oxide Correct Answer : Ammonia Read more