In osmosis water molecules move from area of _____________ through semipermeable memberane?
(A) Higher solute concentration to lower solute concentration
(B) Lower solute concentration to higher solute concentration
(C) Lower solvent concentration to higher solvent concentration
(D) All of these
Normal body temperature in mamals like human beings is____________?
(A) 26 – 28°C
(B) 36 – 38°C
(C) 46 – 48°C
(D) 56 – 58°C
Which of the following fish drink large amount of sea water and excrete concentrated urine resulting in maximum salt excretion and minimal water loss?
(A) Hagfish
(B) Fresh water fishes
(C) Bony fishes
(D) None of these
Which of the following statement about Homeostasis is incorrect?
(A) There is a definite control system that regulates the homeostatic activities
(B) Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment
(C) Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment
(D) All are correct
Which adaptation is acquired by plants of cooler areas to prevent lipid crystal formation in cell membrane?
(A) Change in membrane protein composition.
(B) Change in the solute composition of the cell membrane which prevents crystallization.
(C) Increase in proportion of unsaturated fatty acids.
(D) Development of heat shock proteins.
Which of the following mechanism explains development of anemia in Renal failure?
(A) Failure of bone marrow is accompanied with renal failure.
(B) Destruction of RBC results from accumulated urea in the blood.
(C) Chronicity of the disease is respobsible for anemia
(D) Failure of proper RBC synthesis, due to lack of chemical stimulation.
Which of the following constituent is/are maximum in the filtrate that leaves proximal convoluted tubules?
(A) Glucose
(B) Amino acids
(C) Nitrogenous waste
(D) All of these
Protonephridia are present in____________?
(A) Round worms
(B) Flateworm
(C) Tape worms
(D) Segmented worms
Aquatic animals excrete nitrogenous waste commonly in the form of_____________?
(A) Ammonia
(B) Urea
(C) Uric acid
(D) Trimethylamine oxide