Biology

Respiration and Gas Exchange

958 Questions

Access a targeted set of questions on respiration and gas exchange for competitive exams. Topics include lung volumes, the mechanism of breathing, and respiratory anatomy. Understanding these physiological processes is essential for scoring well.

Lung volumes and capacitiesBreathing mechanismsRespiratory anatomyGas exchange processes

Respiration and Gas Exchange Questions

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

Which of the following activities is characterised by minimum breathing rate?

  1. Sleeping

  2. Washing of clothes

  3. Cleaning of floor

  4. Dancing
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
During sleeping, the body has the least activities to carry out, it does not require a high amount of oxygen. So it has minimum metabolism and hence minimum breathing rate.
So the correct answer is 'Sleeping'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Breathing rate increases which of the following value?

  1. Pulse rate

  2. Metabolic rate

  3. Exhalation

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The breathing rate is no. of times a person breath in one minute. Breathing rate increases when there is high pulse rate and urgent requirement of oxygen in blood. due to which metabolic rate increases in the body. The exhalation also increases to pass out the carbon dioxide out of the body in high amount to increase oxygen concentration in the body.
So the correct answer is 'All of the above'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

During inhalation and exhalation which of the following is seen

  1. Ribs move up and outward, diaphragm moves down

  2. Ribs move down and inwards, diaphragm moves up

  3. Ribs move down and outwards, diaphragm moves down

  4. Ribs move up and inwards, diaphragm moves down
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation
During inhalation, the external intercostal muscles contract and lifts ribs outward, while diaphragm become flat and moves down thereby increases the volume of thoracic cavity.
During exhalation, the external intercostal muscles return the diaphragm and ribs to their normal thoracic volume. Ribs moves down and inwards while diaphragm moves up.
So the correct answer is Both A and B'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

Which of the following is considered to be a breath

  1. 2 inhalation + 2 exhalation

  2. 1 inhalation + 2 exhalation

  3. 2 inhalation + 1 exhalation

  4. 1 inhalation + 1 exhalation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The number of times a person breath is called breathing rate. A breath consists of one exhalation and one inhalation. Inhalation involves the breath in the air while exhalation involves the breath out the air.
So the correct answer is '1 inhalation + 1 exhalation'.
Multiple choice evs forests and life forest - the dwelling place of animals forest and its importance introduction to forests conservation of forest and wildlife wildlife

Which of the following are green lungs?

  1. Green coloured lungs

  2. Lungs with green alga

  3. Lungs in Green coloured animals

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

Forest is called as the green lung because they fix the carbon dioxide in the presence of sunlight and convert them into glucose by the process of photosynthesis. The reaction of carbon dioxide with water during this process releases oxygen as byproduct and glucose is formed. Thus forest replenishes oxygen in turn of carbon dioxide. Thus, the correct answer is option D.

Multiple choice biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

Respiratory quotient (R. Q.) is defined as the

  1. Vol. of $O _{2}$ / vol. of $CO _{2}$
  2. Vol. of $CO _{2}$ / vol. of $O _{2}$
  3. Vol. of $O _{2}$ / vol. of $N _{2}$
  4. Vol. of $N _{2}$ / vol. of $CO _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The volume of carbon dioxide released and oxygen consumed in the process of respiration is called as respiratory quotient or R.Q of that substrate.

Multiple choice zoology diseases and hygiene health introduction to health health and its maintenance

Which of these organs, when infected shows symptoms of cough and breathlessness?

  1. Heart

  2. Stomach

  3. Lungs

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

The lungs may be infected due to the bacterial agent causing Pneumonia. This is the infection in which there is a production of large amount of mucus and so the person suffers from coughing and breathlessness, due to blockage of the air ways.

Thus, the correct answer is option C. 

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

The size of the chest cavity increases during inhalation.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand. The intercostal muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
  • Hence the size of the chest cavity increases during inhalation is a true statement.
  • So, the correct answer is 'True'.
Multiple choice evs respiration in organism human respiration the mechanism of breathing breathing and its movements

During heavy exercise the breathing rate of a person slows down.

  1. True

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

During exercise, the muscle cells need more oxygen to sustain their work This results in an increase in breathing and heart rate because both the lungs and the heart work extra to keep up with the ever growing need of oxygen.

Fermentation takes place in the muscle cells during exercise which results in an increase in the amount of lactic acid, hydrogen ion. This stimulates the respiratory system more and it results in an increase in the heart rate so that the heart pumps more blood. The blood pressure increase which leads to more blood flow in the alveoli.
The lungs absorb more oxygen and the muscle cells receive more blood and thus the oxygen demand is satisfied.
Therefore this statement is false.

Multiple choice various types of barometer fluids physics
Diaphragm is seen as a component of ........ barometer.

  1. Fortin

  2. Simple

  3. Aneroid

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

Aneroid barometers are popular for their light weight and size which increases its portability. The Aneroid barometer uses a small, flexible metal box called an aneroid cell (capsule). The evacuated capsule (or usually several capsules, stacked to add up their movements) is prevented from collapsing by a strong spring which is corrugated in form of a diaphragm. Small changes in external air pressure cause the cell to expand or contract. This expansion and contraction drives mechanical levers such that the tiny movements of the capsule are amplified and displayed on the face of the aneroid barometer.  Since it is calibrated directly for the atmospheric pressure, no prior adjustments are required to be made before its usage.

Multiple choice biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

It is not proper to breathe through our mouth because:

  1. the dust particles would enter our bodies

  2. more carbon dioxide will be inhaled

  3. our throat will become sore

  4. we will catch cold easily
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is not proper to breathe through our mouth because most of the dust particles can enter our body along with the air we breathe in. But breathing through nose does have this because nose has hair present which traps the dust particles.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

The exchange of gases in the alveoli of the lungs takes placed by?

  1. Passive transport

  2. Active transport

  3. Osmosis

  4. Simple diffusion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gas exchange in the alveoli occurs via simple diffusion, where gases move from an area of higher partial pressure to an area of lower partial pressure across the respiratory membrane.