Tag: respiration in organism

Questions Related to respiration in organism

The respiratory organs of larger aquatic animals are

biology respiration in living organisms breathing underwater respiration in other organisms respiration in organism

  1. Tracheae

  2. Lungs

  3. Gills

  4. Book lungs

Show answer
Correct Option: C
Explanation:

Gills are the respiratory organs of large aquatic animals. These organs are specifically adapted to their function. In Osteichthyes, the gills have four gill arches, Chondrichthyes have two, fish has 7 gill baskets with a long bony cover for the gills which is used to push water. 

Which one of the following animals has no blood but respires?

biology respiration in living organisms breathing underwater respiration in other organisms respiration in organism

  1. Earthworm

  2. Hydra

  3. Cockroach

  4. Octopus

Show answer
Correct Option: B
Explanation:

Hydra doesn't have blood. It is a single-cellular animal. In the hydra, respiration is accomplished via diffusion of molecules of oxygen and carbon dioxide through the skin whereas earthworm, cockroach and octopus has blood. Thus, option B is correct.

Leaves of the plant have tiny pores for exchange of oxygen and carbon dioxide. These small pores are known as

biology respiration in organism do plants breathe? plant respiration respiration-plants

  1. Nodule

  2. Stomata

  3. Radicle

  4. None of the above

Show answer
Correct Option: B
Explanation:

In plants, the stoma is a tiny opening found on the under-surface of leaves. These pores provide the passage for the entry of the air and the exchange of gases. They are also useful during transpiration for the escape of water vapour into the atmosphere.

So the correct option is 'Stomata'

Plants take in .......... from the air and give out ..........

biology respiration in organism do plants breathe? plant respiration respiration-plants

  1. Oxygen, Carbon dioxide

  2. Carbon dioxide, Oxygen

  3. Oxygen, Nitrogen

  4. None of the above

Show answer
Correct Option: B
Explanation:

Plants perform photosynthesis to obtain the light energy from direct sunlight and convert it into chemical energy. This process utilizes carbon dioxide, water and sunlight to produce carbohydrates and oxygen. It acts as a counterbalance to respiration by utilizing the carbon dioxide generated by all breathing organisms and giving out the oxygen back to the atmosphere. 

So the correct option is ' Carbon Dioxide, Oxygen'

Which of the following is true for $CO _2$ concentration ?

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. More in alveolar air than in expired air

  2. More in expired air than in alveolar air

  3. More in inspired air than in alveolar air

  4. More in inspired air than in expired air

Show answer
Correct Option: A
Explanation:

The concentration of expired air is more in the alveolar air than in expired air due to the partial pressure of carbon dioxide in alveoli is more than the atmosphere.

So the correct option is 'More in alveolar air than in expired air'

Hiccough (hiccup) is due to activity of

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. Intercostal muscle

  2. Food in air tract

  3. Diaphragm

  4. Inadequate oxygen in environment

Show answer
Correct Option: C
Explanation:

  • Hiccup is also called as a hiccough. It is an involuntary activity of the diaphragm. During hiccups, the diaphragm muscle shows several involuntary contractions. 
  • When the diaphragm muscle contracts, the opening between the vocal cords snaps shut to check the inflow of air. 
  • This results in the hic or hiccup sound. This results due to irritation of the nerves. 

Thus, the correct answer is 'Diaphragm.'

The diaphragm contracts, resulting in inhalation as the volume of thoracic cavity

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs

  1. Decreases in anteroposterior axis

  2. Decreases in dorsoventral axis

  3. Increases in dorsoventral axis

  4. Increases in anteroposterior axis

Show answer
Correct Option: A

Which of the following changes occur in diaphragm and intercoastal muscles when expiration of air takes place?

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

  1. External intercostal muscles relax and diaphragm contracts

  2. External intercostal muscles contracts and diaphragm relaxes

  3. External intercostal muscles and diaphragm relaxes

  4. External intercostal muscles and diaphragm contracts

Show answer
Correct Option: A

The respiratory centre leading to faster breathing is on account of ________________.

evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

  1. Venous blood entering the respiratory centre

  2. Arterial blood entering respiratory

  3. Venous blood leaving the respiratory centre

  4. Arterial blood leaving the respiratory centre

Show answer
Correct Option: A
Explanation:

The medulla oblongata is the primary respiratory control centre. Its main function is to send signals to the muscles that control respiration to cause breathing to occur. The respiratory control centre increase respiratory rate on the account of decrease in blood pH, as the oxygenated blood through veins enter the system, decrease in $CO _2$ levels, increased respiratory rate.

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

  1. Oxidative decarboxylation of pyruvic acid requires the presence of enzyme pyruvate dehydrogenase.

  2. All living cells whether aerobic or anaerobic, perform glycolysis.

  3. Cyanide does not stop chemiosmosis.

  4. Respiratory chain uses ${O} _{2}$ as final hydrogen acceptor.

Show answer
Correct Option: C
Explanation:

Cyanide is an inhibitor of complex IV (in ETS) and other heme-containing enzymes of mitochondria. Thus, cyanide blocks ATP production in the cells.