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Q341
Ureotelic animals are those that eliminate nitrogenous wastes predominantly in the form of
  • A Uric acid
  • B Ammonia
  • C Amino acids
  • D Urea
Answer: Option D
Explanation: Ureotelic animals excrete nitrogen mainly as urea.
Q342
Animal species living in chronic shortage of water generally excrete uric acid as the principal nitrogenous waste product because
  • A Uric acid can be stored in the body for long periods
  • B Uric acid is highly soluble in water and easily eliminated
  • C The kidneys are unable to convert uric acid into urea
  • D Enzymes for urea formation are absent
Answer: Option A
Explanation: Uric acid conserves water by being excreted as a paste.
Q343
Which one of the following sets of animals produces the same substance as their chief excretory product?
  • A Cockroach, camel and lizard
  • B Man, dog and camel
  • C Amoeba, ant and antelope
  • D Fowl, fish and frog
Answer: Option B
Explanation: These animals primarily excrete urea.
Q344
A freshwater fish must continuously
  • A Acquire water and get rid of salt
  • B Get rid of both water and salt
  • C Acquire both water and salt
  • D Get rid of water and acquire salt
Answer: Option D
Explanation: Freshwater fish excrete excess water and actively absorb salts.
Q345
A nephridium of an earthworm drains materials directly from the
  • A Gut
  • B Coelom
  • C Lymph
  • D Blood
Answer: Option B
Explanation: Nephridia collect waste from the coelomic fluid.
Q346
The basic unit of a vertebrate kidney is the
  • A Ureter
  • B Nephron
  • C Malpighian tubule
  • D Islets of Langerhans
Answer: Option B
Explanation: Nephrons filter blood to form urine.
Q347
Nephrons are connected with
  • A Respiratory system
  • B Nervous system
  • C Circulatory system
  • D Excretory system
Answer: Option D
Explanation: Nephrons are part of the excretory system.
Q348
Which of the following has no blood but respires?
  • A Earthworm
  • B Hydra
  • C Cockroach
  • D Fish
Answer: Option B
Explanation: Hydra respires by diffusion through its body surface.
Q349
Which type of respiratory organs are present in spiders and scorpions?
  • A Book lungs
  • B Gill books
  • C Gills
  • D Lungs
Answer: Option A
Explanation: Book lungs are specialized respiratory organs in arachnids.
Q350
The functional respiratory organ of a fully formed tadpole is the
  • A Skin
  • B Lung
  • C Gill
  • D Air bladder
Answer: Option C
Explanation: Tadpoles breathe mainly through gills.

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