Tag: respiration in organism

Quizzes (15) Questions (99)

Questions Related to respiration in organism

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

The respiratory organs of larger aquatic animals are

  1. Tracheae

  2. Lungs

  3. Gills

  4. Book lungs
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

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

  1. Earthworm

  2. Hydra

  3. Cockroach

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

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

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

  1. Nodule

  2. Stomata

  3. Radicle

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

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

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

  1. Oxygen, Carbon dioxide

  2. Carbon dioxide, Oxygen

  3. Oxygen, Nitrogen

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

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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'

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

Hiccough (hiccup) is due to activity of

  1. Intercostal muscle

  2. Food in air tract

  3. Diaphragm

  4. Inadequate oxygen in environment
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'

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

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

  1. Decreases in anteroposterior axis

  2. Decreases in dorsoventral axis

  3. Increases in dorsoventral axis

  4. Increases in anteroposterior axis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During inhalation, the contraction of the diaphragm and external intercostal muscles increases the volume of the thoracic chamber. Specifically, the contraction of the dome-shaped diaphragm increases the volume along the anteroposterior axis, while rib elevation increases the dorsoventral axis.

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

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice evs respiration in organism respiration in humans mechanism of respiration in animals human lungs respiration in human beings respiratory organs in humans

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

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.