Tag: evs

Questions Related to evs

In mammals, the urinary bladder opens into

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Uterus

  2. Urethra

  3. Vestibule

  4. Ureter

Show answer
Correct Option: B
Explanation:

The urinary bladder is the organ that collects urine excreted by the kidneys before disposal by urination. Urine enters the bladder via the ureters and exits via the urethra. 

So, the correct answer is option B.

Kidneys, skin and lungs are

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Excretory organs

  2. Digestive organs

  3. Reproductive organs

  4. None of the above.

Show answer
Correct Option: A
Explanation:

The lungs, kidneys, and skin are excretory organs. Excess carbon dioxide is removed from the body through the lungs. Excess urea, water, and salts are removed by the kidneys and leave the body as urine. Excess water and salts also leave the body through the skin through sweat.

So, the correct answer is option A.

Which one is an accessory excretory organ?

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Liver

  2. Stomach

  3. Intestine

  4. Heart

Show answer
Correct Option: A
Explanation:
An organ that helps in a process but is not part of the tract related to that biological process is called as accessory organ.
For instance, salivary glands, liver, gallbladder, and pancreas are not part of the digestive tract, but they have a role in digestive activities. The accessory digestive organs are the tongue, salivary glands, pancreas, liver, and gallbladder.
Hence, the answer is 'Liver'

The urinary bladder is muscular and is under ............ control.

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Muscular

  2. Mechanical

  3. Nervous

  4. Hormonal

Show answer
Correct Option: C
Explanation:

The urinary bladder is made up of several detrusor muscles which mainly expands and contracts by the signals received by the autonomic nervous system. Parasympathetic nerves from the S2, S3 and S4 levels of spinal cord cause the upper part of the bladder to contract and bladder neck to relax, assisting in the process of micturition (urination). Sympathetic nerves from the $T _{11}$-$L _2$ levels of spinal cord do the opposite, causing the upper section of the bladder to relax and the bladder neck to contract, ensuring urine storage.

So, the correct answer is option C.

Which one is not supplied exclusively with involuntary muscles?

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Iris

  2. Gland ducts

  3. Urethra

  4. Coats of blood vessels

Show answer
Correct Option: C
Explanation:

Iris is supplied by involuntary muscles which contract or relax in response to photo stimuli. Gland ducts have muscles in their walls and in the form of sphincters which are involuntary. Coats of blood vessels also have a muscle layer sandwiched between two other layers. Urethra has two sphincters of which one is involuntary and one is voluntary. Hence, urethra is not exclusively supplied with involuntary muscles.

The wall of urinary bladder has a thick layer of smooth muscle called

evs excretion in living organisms other systems in the body excretory system in human human excretory organs

  1. Dartos

  2. Detrusor

  3. Deltoid

  4. Depressor

Show answer
Correct Option: B
Explanation:

a) Dartos muscle is a muscle present in the scrotal sac. 

b) Deltoid muscle is a muscle of the upper arm. 
c) Depressor muscle is a facial muscle. 
d) Detrusor smooth muscle present in the wall of the urinary bladder is detrusor muscle. It helps in contraction of the urinary bladder during micturition.
So, the correct answer is 'Detrusor'.

Which of the following is the correct order of increasing size of the grains of soil particles?
A. Clay
B. Silt
C. Sand
D. Gravel

evs mud and stones soil types types of soil soil - types, uses and need for conservation

  1. B, C, A, D

  2. D, C, A, B

  3. A, B, C, D

  4. C, D. B, A

Show answer
Correct Option: C
Explanation:

The correct order of the increasing size of soil particle is-

Clay is the finest of all the particles then slit which has slightly larger particles than clay. Sand has bigger particles and gravel has the largest particle size.
Show the correct option is 'A, B, C, D'

The soil with poorest water holding capacity is

evs mud and stones soil types types of soil soil - types, uses and need for conservation

  1. Clayey

  2. Loamy

  3. Sandy

  4. None of above

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Correct Option: C

Soil provides home to which of the following animals?

evs mud and stones soil types types of soil soil - types, uses and need for conservation

  1. Rat

  2. Earthworm

  3. Rabbit

  4. All of these

  5. None of these

Show answer
Correct Option: D
Explanation:

The upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles. It provides home to variety of microscopic and macroscopic organisms.

So, the correct option is 'All of these'. 

Salinization is _____________

evs mud and stones soil types types of soil soil - types, uses and need for conservation

  1. Accumulation of salts in water

  2. Accumulation of salts in soil

  3. Accumulation of salts in body

  4. Accumulation of salts in animals

Show answer
Correct Option: B