12th class (Fsc) Biology unit 1 MCQs
26. Number of ammonia molecules required for produce one molecule of urea is:
a. 03
b. 01
c. 04
d. 02
27. Nitrogenous waste is very toxic and dissolves quickly in body fluid is:
a. Ammonia
b. CO2
c. Uric acid
d. Urea
28. Metabolism of purines and pyrimidines produce significant amount of:
a. Xanthine
b. Creatinine
c. Trimethyl amine oxide
d. Creatine
29. The excretory product that requires maximum water for its removal is:
a. Urea
b. Ammonia
c. Uric acid
d. Creatinine
30. The nitrogenous waste which is highly toxic and dissolves quickly in body fluids is:
a. Uric acid
b. Ammonia
c. Carbon dioxide
d. Urea
31. The chief nitrogenous waste in birds and reptiles is:
a. Uric acid
b. Ammonia
c. Creatirine
d. Urea
32. The group of animals whose excretory system is structurally associated with nutritive tract:
a. Planaria
b. Vertebrates
c. Insects
d. Earthworms
33. Flame cells are part of excretory system of:
a. Planaria
b. Hydra
c. Earthworm
d. Cockroach
34. Animals of the group of flatworms have simple tubular excretory system called as:
a. Nephridia
b. Kidney
c. Protonephridia
d. Nephron
35. The planaria flatworm have simple tubular excretory system known as:
a. Mesonephridium
b. Protonephridium
c. Prenephridium
d. Metanephridium
36. A network of close tubule without internal opening is called:
a. Nephron
b. Protonephridium
c. Kidney
d. Metanephridium
37. Cockroach and other insects remove their nitrogenous waste in form of:
a. Uric acid
b. Ammonia
c. Creatinine
d. Urea
38 . The tubular excretory system of planaria is:
a. Mesonephridia
b. Protonephridia
c. Eunephridia
d. Metanephridia
39. Protonephridium is found in:
a. Earthworm
b. Hydra
c. Cockroach
d. Planaria
40. Metanephridia are the excretory structures present in:
a. Cockroach
b. Hydra
c. Earthworm
d. Planaria
41. Excretory system present in cockroach in:
a. Nephridia
b. Contractile vacuole
c. Flame cells
d. Malpighian tubles
42. The partly digested food in cockroach is temporarily stored in:
a. Rectum
b. Crop
c. Stomach
d. Gizzard
43. The metabolic wastes that are ingested into the body and must be removed:
a. Food additives
b. Pesticides
c. Drugs
d. All of these
44. The removal of Sebum on the skin is for:
a. Protection
b. Nutrition
c. Thermoregulation
d. Excretion
45. Urea is produced in:
a. Kidney
b. Lungs
c. Pancreas
d. Liver
46. Arginase splits the arginine to form urea and:
a. Creatinine
b. Ornithine
c. Ammonia
d. Citruline
47. The central station of metabolism and the body’s central metabolic clearing agent is:
a. Kidney
b. Stomach
c. Gut
d. Liver
48. Which of the following is not synthesized in liver?
a. Albumin
b. Urea
c. Urine
d. Uric acid
49. Of all the excretory products, the principal one is:
a. Uric acid
b. Ammonia
c. Bilirubin
d. Urea
50. Bilirubin damages brain cells and turn the skin and whites of eyes yellow, condition is known as:
a. Botulism
b. Hepatitis
c. Jaundice
d. Leukemia