Tag: evs

Questions Related to evs

Which of the following maintains the volume of air in the chest cavity during breathing?

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Diaphragm

  2. Lungs

  3. Breastbone

  4. None of the above

Show answer
Correct Option: A
Explanation:

The diaphragm is a dome-shaped, muscular and membranous structure that separates the chest and abdominal cavities in mammals. It is the principal muscle of respiration that maintain the volume of air in the chest cavity during breathing.

So the correct answer is 'Diaphragm'.

Organs responsible for breathing in humans and fishes respectively are

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Lungs in both

  2. Gills and lungs

  3. Gills in both

  4. Lungs and gills

Show answer
Correct Option: D
Explanation:

Humans have lungs to carry out respiration. Lungs are ingrowths of the body wall and correct to the outside by a series of tubes and small openings.

Whereas grills are convoluted outgrowths containing blood vessels covered by a thin epithelial layer. They increase the surface area for gas exchange in fishes.
So the correct answer is 'Lungs and Gills'. 

During which of the following process the diaphragm moves down?

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Inspiration

  2. Expiration

  3. Coughing

  4. None of the above

Show answer
Correct Option: A
Explanation:

During inspiration, the diaphragm moves down. The contraction of muscle fibers of the diaphragm causes it to become flat and lowered down thereby increasing the volume of the thoracic cavity in anteroposterior axis, in rabbit or lengthwise in man.

So the correct answer is 'Inspiration'

If the $CO _2$ concentration in the blood increases, the breathing shall.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Increase

  2. Decrease

  3. Stop

  4. No affect

Show answer
Correct Option: A

Ram walked for 10 minutes and Shyam ran for 100 meters. Karan is at rest. Arrange in decreasing order of breathing rate.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Ram>Shyam>Karan

  2. Karan>Shyam>Ram

  3. Shyam>Ram>Karan

  4. All the 3 will have the same breathing rate

Show answer
Correct Option: C
Explanation:
Physical activity increases the pulse rate of the body. Higher is the pulse rate, higher will be the breathing rate of a person. Shyam who ran for 100m has more pulse rate than Ram, who only walked for 10 minutes and Karan, who is at rest. So the breathing rate is also higher for Shyam than Ram and Karan.
So the correct answer is 'Shyam>Ram>Karan'.

$CO _2$4 is transported mainly as.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Dissolved in blood plasma

  2. As carbonic acid

  3. In carbaminohaemoglobin

  4. As carbaminohaemoglobin and carbonic acid

Show answer
Correct Option: D

Pneumatic and inhibitory centres are associated with.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Respiration

  2. Breathing

  3. Inspiration

  4. Expiration

Show answer
Correct Option: B

The number of times a person breathes in a minute is called as

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Inhalation

  2. Respiratory rate

  3. Breathing

  4. Breathing rate

Show answer
Correct Option: D
Explanation:
The number of times a person breathes in a minute is called breathing rate. The normal breathing rate for an adult at rest is 12-20 breathes per minute. Breathing rate below and above this range indicates the diseased condition of a person.
So the correct answer is 'Breathing rate'.

During rest, metabolic requirements are minimum. This is indicated by

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Pulse

  2. Breathing

  3. $O _2$ intake and $CO _2$ output

  4. All the above

Show answer
Correct Option: D

The two organisms which breathe only through their moist skin are.

evs respiration in organism human respiration the mechanism of breathing breathing and its movements

  1. Frog and Earthworm

  2. Fish and Frog

  3. Fish and Earthworm

  4. Leech and Earthworm

Show answer
Correct Option: D