This set of Human Physiology Multiple Choice Questions & Answers (MCQs) focuses on “Types of Excretion”.
1. Uricotelism is found in ____________
a) Birds reptiles and insects
b) Frogs and toads
c) Mammals and birds
d) Fishes and fresh water protozoans
View Answer
Explanation: Elimination of uric acid as main nitrogenous waste material is called uricotelism. It is fond in mammals and birds.
2. A terrestrial animal must be able to ________
a) Excrete large amount of water
b) Actively pump salts through skin
c) Excrete large amount of salts in urine
d) Conserve water
View Answer
Explanation: A terrestrial animal must be able to conserve water as it is very necessary to the body. Less amount of water in the body will lead to dehydration.
3. Animals which excrete urea are known as ____________
a) Aminotelism
b) Ureotelism
c) Uricotelism
d) Ammonotelism
View Answer
Explanation: Animals which excrete urea are known as Uricotelism. It is seen in birds and diapsids, insects, lizards and snakes. Uric acid is less toxic than ammonia or urea.
4. Which of the following nephridia are not found in earthworm?
a) Septal nephridia
b) Macronephric nephridia
c) Pharyngeal nephridia
d) Integumentary nephridia
View Answer
Explanation: Nephridia are a tubule open to the exterior which acts as an organ of excretion or osmoregulation. It removes metabolic wastes from animal’s body. Macronephric nephridia are not found in the earthworm.
5. Excretory waste of birds and reptiles are _________
a) Urea
b) Uric acid and urea
c) Uric acid
d) Ammonia and uric acid
View Answer
Explanation: Excretory waste of birds and reptiles are ammonia and uric acid. They are Uricotelism animals.
6. Which of the following is the only vertebrate osmoconformer?
a) Bird
b) Hag fish
c) Rabbit
d) Dog
View Answer
Explanation: Osmoconformers are marine organisms that maintain an internal environment that is osmotic to their external environment. This is seen in hag fish.
7. Sea gulls excrete salts from ___________
a) Nasal chamber
b) Liver
c) Lungs
d) Kidneys
View Answer
Explanation: Sea gulls excrete salts from the nasal chamber. They have the presence of salt gland.
8. Simultaneous movement of two molecules across a membrane in the same direction is known as _______
a) Antiport
b) Symport
c) Uniport
d) Biport
View Answer
Explanation: A symporter is an integral membrane protein that is involved in the transport of many different molecules across the cell membrane. There is a simultaneous movement of two molecules across the membrane.
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