Tag: zoology

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Questions Related to zoology

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Characteristics shared by urea, uric acid and ammonia are
a. They are nitrogenous wastes
b. They need a large amount of water for excretion
c. They are equally toxic
d. They are produced in kidneys.

  1. a, c

  2. a, d

  3. a, c, d

  4. a only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The characteristic shared by urea, uric acid and ammonia are they are nitrogenous wastes. In comparison to Ammonia and Urea, uric acid is the least toxic and the least soluble in water. It can be stored in cells and body tissues without any toxic effects and hence needs less water for excretion when compared to Ammonia and urea.

So, the correct answer is 'a only'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

The first formed nitrogenous waste of vertebrates is

  1. $NH _2$

  2. Urea
  3. $NH _3$
  4. $NH _4$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For terrestrial vertebrates, nitrogenous wastes are removed from body fluids by the action of the kidneys, the same organ involved in maintaining water balance. Ammonia the direct waste produced as a byproduct of protein metabolism.  Produced by all animals.  Because of its toxicity, many animals convert ammonia into a less toxic form.  Any conversion of ammonia into other forms comes at a price, for animals must expend cellular energy (ATP) to convert ammonia to either form of nitrogenous waste listed below.


So, the correct option is 'Ammonia'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Which is not a ketone body?

  1. Succinic acid

  2. Acetone

  3. Acetoacetic acid

  4. p-hydroxybutyric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chemicals that the body makes when there is not enough insulin in the blood and it must break down fat instead of the sugar glucose for energy. The ketone bodies -- acetone,  acetoacetate, and beta-hydroxybutyrate -- are toxic acidic chemicals. They build up in the blood and then spill over into the urine. The body can also rid itself of acetone through the lungs. This gives the breath a fruity odor.

So, the correct option is 'Succinic acid'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

How many molecules of ammonia are required to form 8 molecules of urea?

  1. 24

  2. 8

  3. 16

  4. 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Urea synthesis is a five-step cyclic process, with five distinctive enzymes. One turn of the cycle consumes 2 molecules of ammonia and  1 molecule of carbon dioxide and creates 1 molecule of urea ((NH2)2CO. Hence  16  molecules of ammonia are required to form 8 molecules of urea.

So, the correct answer is 'Option C'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Which of the following statement, is false?

  1. Urea is more toxic than ammonia.

  2. Ammonia is converted to urea in liver.

  3. Ammonia is produced in the body cells by the metabolism of proteins.

  4. Fluid collected in Bowman's capsule is called glomerular fluid.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ammonia is more water soluble and more toxic than Urea or uric acid. Ammonia is extremely toxic and its accumulation in the body can be lethal. So the liver converts toxic ammonia into less toxic urea through the urea cycle.

So, the correct answer is 'Option A'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Ketone bodies consist of

  1. Nicotinic acid, folic acid and ascorbic acid

  2. Acetone, beta hydroxybutyryl CoA and if acetoacetic acid

  3. Acetoacetic acid acetone and beta hydroxybutyric acid

  4. Acetic acid, acetone and beta hydroxybutyric acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ketone bodies are byproducts in the metabolism of fat. During starvation or fasting conditions the liver synthesizes glucose through a process called gluconeogenesis. Gluconeogenesis is a metabolic pathway that results in the generation of glucose from fat. During gluconeogenesis, the ketone bodies are formed as byproducts where the product is glucose. The Kerone bodies consist of acetoacetic acid, acetone and beta-hydroxybutyric acid.

So, the correct answer is 'Acetoacetic acid, acetone and beta-hydroxybutyric acid'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Which of the following sets of animals produce the same substances as their chief excretory product?

  1. Fish, pigeon and frog

  2. Camel, housefly and snake

  3. Frog, monkey and dog

  4. Amoeba, ant and antelope
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Birds, reptiles, and fishes produce uric acid waste and they are called Uricothelic organisms.
  • They tend to excrete uric acid as its waste which is in the form of a white paste or powder.
  • Producing uric acid over urea is advantageous because it is less toxic and reduces water loss and the subsequent need for water.  in these organisms.
  • The correct answer is OPTION A.
Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Study the following.


(i) Uricase enzyme is not found in apes and man.
(ii) Purine metabolism leads to the formation of uric acid.
(iii) In ureotelic organisms, carbondioxideCO2 and ammonia converted into urea through the Cori cycle.
(iv) More energy consumed is for the production of uric acid.
(v) TMO (Trimethylamine oxide) protects the proteins from the effect of urea in Chondrichthyes fishes.

Which of the given statements are correct?

  1. All, except II

  2. All, except III

  3. All, except IV

  4. All, except V
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When muscles work continuously enough, oxygen is not reached to muscles to burn glucose aerobically in such conditions glucose is converted into lactic acid i.e anaerobic glycolysis. The lactic acid produced in muscles is moved to the liver and converted to glucose. In ureotelic organisms, lactic acid is converted into Glucose through the Cori cycle. This metabolic cycle was discovered by Carl Ferdinand Cori and  Gerty Cori, hence named Cori cycle.

So, the correct answer is 'Option B'.

Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Some animals convert highly toxic $NH _3$ into least toxic trimethylamine oxide $(TMAO)$ and retain high concentration of $TMAO$ and urea to minimise $H _2O$ loss from body are

  1. Sharks and rays

  2. Fresh water bony fishes

  3. Myxine

  4. Marine bony fishes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Marine teleost fishes excrete a large proportion of their nitrogen as trimethylamine oxide (TMAO). Large amounts of this compound is also stored in their body for osmoregulation i.e. to minimize loss of water and entry of salts.

So, the correct option is 'Sharks and rays'
Multiple choice zoology forest and wildlife laws - environmental ethics and resource use participation of people in conservation people's contribution in forest conservation laws and movements for the conservation of forests and wildlife

Who started chipko movement?

  1. Sunderlal Bahuguna

  2. Amrita Devi Bishnoi

  3. Anna Hazare

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Chipko movement, a non-violent social and ecological movement, was led by Sunderlal Bahuguna, who was a prominent activist and environmentalist.