Tag: zoology

Quizzes (289) Questions (5869)

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

Excretory products of mammals are useful to plants. Which of the following is not a part of such secretions?

  1. Carbon dioxide

  2. Mineral salts

  3. Bile pigments

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

The major excretory products are carbon dioxide, excess water, and nitrogenous compounds like ammonia, urea, uric acid, etc. Carbon dioxide and water are produced in the process of tissue respiration. Nitrogenous compounds are formed from the breakdown of proteins and amino acids. So, the correct option is "B" (Mineral salt).

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

What is the first excretory substance in animal body?

  1. Urea

  2. Ammonia

  3. Amino acid

  4. Uric acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ammonia was the first and simplest excretory substance in the animal body and is excreted as it is toxic. It requires large amounts of water for its excretion and so it is seen in most aquatic vertebrates and invertebrates.

So, the correct answer 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 living organism is not a uricotelic?

  1. Insects

  2. Birds

  3. Crocodile

  4. Alsatian dog
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A) Insects are uricotelic.
B) Birds are uricotelic.
C) Crocodiles and all reptiles are uricotelic.
D) The Alsatian dog is a mammal. Mammals are ureotelic (excrete urea).
So the correct answer is 'Alsheshan dog'.
Multiple choice zoology excretion in living organisms excretion - animals human excretory system and products excretory system and products excretion - plants excretion in plants

Animals return water to the environment by
(i) Perspiring
(ii) Drinking
(iii) Urinating
(iv) Breathing

  1. (i), (iii) and (iv)

  2. (i) and (ii)

  3. (i) and (iii)

  4. (iii) and (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A) Perspiration (sweating) is the loss of water and salts through the surface of the skin. This water evaporates. Urine is mostly water and is also composed of salts and is excreted by the animal into the environment. While breathing, minute molecules of water or water vapour are given out into the environment along with carbon dioxide.

B) While drinking water, the animal consumes it from the environment.
C) Perspiration and urination release water into the environment.
D) Breathing releases water in form of water vapour into the environment.
So, the correct answer is '(i), (iii) and (iv)'.

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

State whether the following statement is true or false.


Some organisms store wastes in body parts.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Organisms can store their wastes in different glands and organs such as the kidneys, sweat glands, lungs etc. All the nitrogenous and solid wastes are stored by different organisms for a certain period in certain body organs such as the kidneys and the intestines, after which they are eliminated from the body. So, the correct option is 'True'.

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

Assertion  :  Earthworms excrete both ammonia and urea



Reason    :    Excretion in earthworm depends on the
                       environment.




  1. If both the assertion and the reason are true and the reason

    is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is

    not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Earthworms excrete ammonia when sufficient water is available, because a large volume of water is needed by the animal to dissolve ammonia and eliminate it from, the body. Whereas in drier environment the animal eliminates urea as it requires only considerable amount of water for the excretion of urea because urea is very soluble in water.

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

Most abundant, harmful and universal waste product of metabolism is

  1. Uric acid
  2. $H _20$
  3. $CO _2$

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

The end products of aerobic metabolism of carbohydrates are carbon dioxide and water. Carbon dioxide remains dissolved in the blood and is carried by the veins to the lungs for oxygenation. If carbon dioxide is not removed from the metabolizing tissues, it will be toxic for that tissue and stop metabolism.

So, the correct option is 'Carbon dioxide'.

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

Which one is both osmoregulator as well as nitrogenous product?

  1. $NH _3$

  2. Urea

  3. Uric acid

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Urea is both osmoregulator as well as nitrogenous waste. Urea is produced in the liver and excreted through urine. The urea helps in osmoregulation by participating in counter current system, small amounts of urea enter the thin segment of the ascending limb of Henle’s loop which is transported back to the interstitium by the collecting tubule.  

So, the correct answer is 'Urea'.

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

Excretory product of spider is

  1. Ammonia

  2. Uric acid

  3. Guanine

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

The excretory product of spider is guanine. It is formed as a result of nucleotide metabolism. It does not require water for elimination because it is less soluble than uric acid and helps to conserve more water.

So, the correct answer is 'Guanine'.

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

A portion of uric acid is changed into urea and ammonia by intestinal

  1. Urogenolysis

  2. Ureolysis

  3. Uricolysis

  4. Ureotolysis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The bacteria present in intestinal tract break a portion of uric acid present in the food we eat into urea and ammonia. This phenomenon is called uricolysis. Hence a portion of uric acid is changed into urea and ammonia by intestinal bacteria is called as urinalysis.
So, the correct answer is 'Uricolysis'.