Tag: evs

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Questions Related to evs

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

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

  1. Diaphragm

  2. Lungs

  3. Breastbone

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

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

Organs responsible for breathing in humans and fishes respectively are

  1. Lungs in both

  2. Gills and lungs

  3. Gills in both

  4. Lungs and gills
Reveal answer Fill a bubble to check yourself
D Correct answer
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'. 

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

During which of the following process the diaphragm moves down?

  1. Inspiration

  2. Expiration

  3. Coughing

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

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

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

  1. Ram>Shyam>Karan

  2. Karan>Shyam>Ram

  3. Shyam>Ram>Karan

  4. All the 3 will have the same breathing rate
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

$CO _2$4 is transported mainly as.

  1. Dissolved in blood plasma

  2. As carbonic acid

  3. In carbaminohaemoglobin

  4. As carbaminohaemoglobin and carbonic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CO2 is transported in the blood primarily as bicarbonate ions, but also as carbaminohaemoglobin (bound to hemoglobin) and dissolved in plasma. Option D covers the main transport mechanisms.

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

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

  1. Inhalation

  2. Respiratory rate

  3. Breathing

  4. Breathing rate
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

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

  1. Frog and Earthworm

  2. Fish and Frog

  3. Fish and Earthworm

  4. Leech and Earthworm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frogs and earthworms are classic examples of organisms that utilize cutaneous respiration, meaning they breathe through their moist skin. While frogs also have lungs, their skin is a primary respiratory surface, and earthworms rely entirely on cutaneous respiration.