Biology

Respiration and Gas Transport

647 Questions

Respiration and gas transport deal with the physiological mechanisms of breathing, including the role of hemoglobin in oxygen transport and the removal of carbon dioxide from the blood. Questions cover both aerobic and anaerobic processes, along with related phenomena like altitude sickness. This human biology topic is a staple in the science sections of competitive tests.

Oxygen and hemoglobin transportAnaerobic respiration effectsCarbon dioxide removalAltitude sickness causesBreathing rate regulation

Respiration and Gas Transport Questions

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

Which of the following is not a function of blood ?

  1. Transport of food materials

  2. Transport of oxygen

  3. Transport of excretory materials

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood Is an important fluid connective tissue which circulates throughout the body. It performs some very important functions like transport of oxygen from lungs to the cells, transport of food material, Transport of excretory material, Transport of other substances and Transport of cell wreckage. etc. 

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

How blood maintains the physiological co-operation of the body?

  1. By changing the temperature of the body

  2. By producing nutrients

  3. By circulating from one part to other

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

The main function of the cardiovascular system is, therefore, to maintain blood flow to all parts of the body, to allow it to survive. Veins deliver used blood from the body back to the heart. In the lungs, the blood picks up oxygen that we breathe in and gets rid of carbon dioxide, which we breathe out.


So, the correct option is 'By circulating from one part to other'.

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

Blood of insects

is colourless



Reason : The blood

of insect does not play any role in transport of oxygen.






  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
B Correct answer
Explanation

(b) Blood is colourless in insects. insects have tracheal respiration. It is carried on by an extensive system of inter-communicating tubes called trachea.





Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

Blue copper protein complex contained in some molluscs in their plasma for oxygen transport is?

  1. Haemocyanin

  2. Chlorocruorins

  3. Bilirubin

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

Haemocyanin is a copper-containing protein that transports oxygen in the blood of many molluscs and arthropods, giving the blood a blue color when oxygenated.

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F).
(i)    Expiration  is  normally  brought about by the relaxation of inspiratory muscles.
(ii)   Oxyhaemoglobin can hold much less carbon dioxide in the form of carbaminohaemoglobin than what deoxyhaemoglobincan.
(iii)  A person can expel air the air from the lungs by a forceful expiration.
(iv) A rise in $PCO _{2}$ increases the oxygen - affinity of haemoglobin.

  1. (i)F (ii)F (iii)T(iv)F

  2. (i)T (ii)T(iii)F(iv)F

  3. (i)F (ii)T(iii)T(iv)F

  4. (i)T (ii)T(iii)T(iv)F
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A person cannot expel all the air from the lungs even after forceful expiration. The volume of air which remains in the lungs after the most forceful expiration is called residual volume, it is about 1100 mL to 1200 mL A rise in $PCO _{2}$ decreases the $O _{2}$ affinity of haemoglobin.

Multiple choice zoology frog circulatory system in frog frog - digestive system, circulatory system, excretory system and reproductive system animal diversity - ii (phylum: chordata)

Mixing of oxygenated and deoxygenated blood occurs in the ventricle of

  1. Scoliodon

  2. Frog

  3. Rabbit

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

The frog heart has a single ventricle where oxygenated blood from the left atrium and deoxygenated blood from the right atrium mix before being pumped to the body.

Multiple choice biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

Four sets of three precautions to be taken while setting up the experiment to show that $CO _{2}$ is evolved during respiration are given below. Find the correct set of precautions.

  1. Airtight setup, delivery tube dips in water in beaker, germinating seeds in flask

  2. Thread holding KOH pellets, airtight flask, delivery tube just above the water level in the beaker

  3. Germinated seeds completely under the water in the flask, experimental setup not airtight, delivery tube above water level.

  4. Delivery tube touching the bottom of the beaker, KOH pellets kept along with germinating seeds at the bottom of the flask, seeds should not germinate.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The experiment requires an airtight setup to prevent atmospheric CO2 from interfering. KOH pellets are used to absorb the CO2 produced by the germinating seeds, creating a partial vacuum that draws water up the delivery tube.

Multiple choice biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

A student sets up the apparatus for the experiment to show that $CO _{2}$ is released during
respiration. After two hours he would observe :

  1. KOH turning milky

  2. water level rising in the bent tube in the beaker.

  3. water level decreasing in the bent tube

  4. no change in water level in the bent tube.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As the germinating seeds respire, they consume oxygen. The KOH pellets absorb the CO2 released. This consumption of gas inside the airtight flask creates a pressure drop, causing the water level in the bent tube to rise.

Multiple choice biology nutrition and respiration importance of light for photosynthesis various experiments on photosynthesis experiments on photosynthesis - gases

In the experiment to show that $CO _{2}$, is given out during respiration the chemical filled in the small test tube is :

  1. alcohol

  2. KOH

  3. lime water

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

KOH (potassium hydroxide) is used in the experiment because it effectively absorbs carbon dioxide gas, which allows the student to observe the change in pressure.

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood body fluid

Which is the primary means of transport of oxygen in the body?

  1. Pus

  2. Mucus

  3. Blood

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

Blood is the primary means of transport in the body as it is responsible for transporting important nutrients and materials to and from the cells and molecules that make up our body. It is the duty of blood to first take the oxygen processed by the lungs to all the cells of the body and then to collect the carbon dioxide from the cells and deliver it to the lungs. 

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood body fluid

Blood is responsible for regulation of

  1. Water

  2. Mucus

  3. Oxygen

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

The blood helps to keep certain values of the body in balance. For instance, it makes sure that the right body temperature is maintained. This is done both through blood plasma, which can absorb or give off heat, as well as through the speed at which the blood is flowing. When the blood vessels expand, the blood flows more slowly and this causes heat to be lost. When the environmental temperature is low the blood vessels can contract, so that as little heat as possible is lost. Even the so-called pH value of the blood is kept at a level ideal for the body. The pH value tells us how acidic or alkaline a liquid is. A constant pH value is very important for bodily functions.


So, the correct option is 'Temperature'.

Multiple choice biology locomotion and movement locomotion in animals bones and movements muscle contraction types of muscles muscles

During strenuous muscular activity, hydrogens removed from sugar molecules are accepted temporarily by .......... to form..........        

  1. oxygen; water

  2. pyruvate; lactic acid

  3. myoglobin; carbaminohaemoglobin

  4. oxygen; carbon dioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During the strenuous muscular activity, hydrogens removed from sugar molecules are accepted temporarily by pyruvate to form lactic acid.

So, the correct option is 'pyruvate; lactic acid'.