1. Excretion of nitrogenous waste product mainly as uric acid by birds is helpful in
a) Conserving body heat
b) Conserving water
c) Eliminating excess water
d) Eliminating excess body heat
Explanation: Conserving water
2. Uric acid is formed in human being from
a) Proteins
b) Glucose
c) Purines
d) Pyrimidines
Explanation: Uric acid is formed in human being from purines.
3. Uric acid is excreted by
a) Pigeon
b) Frog
c) Rabbit
d) Man
Explanation: Uric acid is excreted by pigeon.
4. The least toxic nitrogenous waste is
a) Ammonia
b) Ammonia + Urea
c) Urea
d) Uric acid
Explanation: The least toxic nitrogenous waste is uric acid.
5. Marine teleost fishes excrete
a) Uric acid
b) TMO
c) Ammonia
d) All of these
Explanation: TMO
6. Select the correct statement from the following:
(A) In most of the invertebrates, excretory structures are in complex tubular forms.
(B) Vertebrates have simple tubular organ as excretory structure like kidney.
(C) Protonephridia is primarily concerned with excretion.
(D) Protonephridia are excretory structure in rotifers, some annelids and cephalochordates
(Amphioxus).
a) A
b) B
c) C
d) D
Explanation: Statement 'D' is correct.
7. Excretory and osmoregulatory structure in cockroach is
a) Flame cells
b) Green glands
c) Nephridia
d) Malpighian tubules
Explanation: Malpighian tubules
8. The animal which retains urea for hypertonicity is (most appropriate)
a) Elasmobranch
b) Man
c) Bird
d) Amphibian
Explanation: Elasmobranch
9. Malpighian tubules are the excretory organs in
a) Platyhelminthes
b) Cockroach
c) Pila
d) Ascaris
Explanation: Cockroach
10.In annelids, excretory organs are
a) Nephridia
b) Malpighian tubules
c) Green glands
d) Kidneys
Explanation: Nephridia