Tag: respiration in living organisms

Questions Related to respiration in living organisms

Which of the following is the main purpose of respiration in plants?

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. Breaking of complex food into simple ones

  2. Production of energy

  3. Exchange of gases

  4. Both A and B

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Correct Option: D
Explanation:

Cellular respiration is the process by which cells in plants and animals break down sugar and turn it into energy, which is then used to perform work at the cellular level. The purpose of cellular respiration is simple, it provides cells with the energy they need to function. If living things could not get the energy they need out of food, it would be absolutely worthless. All living things would eventually die, no matter the quality and amount of food. Cellular respiration is used to create usable energy from the foods that living things eat. It's important to know that the reactions involved in cellular respiration are catabolic, meaning they break down molecules into smaller ones. This differs from anabolic reactions, which build bigger molecules from smaller ones. 

So, the correct option is 'Both A and B'.

Which one of the following organism may respire in the absence of oxygen?

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. Azotobacter

  2. Clostridium

  3. Rhizobium

  4. Lactobacillus

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Correct Option: A

Consider the following statements.
a. Acetaldehyde is an electron acceptor during respiration
b. In Critic Acid Cycle, pyruvate is transported from cytosol to mitochondrial matrix
c. The Pentose Phosphate Pathway occurs in cytosol
Which of these statements are correct?

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. $1, 2$ and $3$

  2. $1$ and $2$

  3. $2$ and $3$

  4. $1$ and $3$

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Correct Option: A

During respiration there is

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. gain in dry weight

  2. loss in dry weight

  3. no change in dry weight

  4. increase in the overall weight

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Correct Option: B
Explanation:

During respiration, due to consumption of organic resources in the cell the dry weight decreases. In respiration, there is a loss in dry weight.

Hence, the correct answer is 'loss in dry weight'.

Which of the following is incorrectly matched?

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. $Protein \rightarrow$ Degraded by Proteases

  2. Fats $\rightarrow$ Fatty acid + Glycerol

  3. Kreb's cycle $\rightarrow$ Carboxylation

  4. Respiration Pathway $\rightarrow$ Amphibolic Pathway

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Correct Option: B

Where do plant roots take up oxygen from?

biology respiration in living organisms breathing in plants mode of respiration in plants process of respiration

  1. Atmospheric air

  2. Air spaces between soil particles

  3. Water in soil particles

  4. None of the above

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Correct Option: B
Explanation:

Plant's roots are embedded into the soil. The soil has air spaces which allow the tip of the roots to take up oxygen and then this is transported to the other parts of the plant.

So the correct answer is 'Air spaces between the soil'.

Rate and depth of

respiration shall increase when






zoology respiration in living organisms respiration in human beings respiration and associated structures respiration in humans

  1. Oxygen concentration increases

  2. $CO _2$ concentration increases

  3. $HCO _3$ concentration increases

  4. $HCO _3$ concentration decreases

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Correct Option: B
Explanation:

(b) Activity of respiratory centres is directly proportional to the level of free $CO _2$ in blood.

State whether the following statements are true or false.
A normal man respires 70-80 times in a minute.

zoology respiration in living organisms respiration in human beings respiration and associated structures respiration in humans

  1. True

  2. False

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Correct Option: B
Explanation:

A normal man, when resting, usually respires about 12-18 times per minute. So, the correct option is 'False'.

 A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called

zoology respiration in living organisms respiration in human beings respiration and associated structures respiration in humans

  1. inspiratory reserve volume

  2. tidal volume

  3. expiratory reserve volume

  4. vital capacity.

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Correct Option: B
Explanation:

The volume of air inspired or expired during normal breath is called tidal volume. It is about 500 mL of air in average young adult man.

Heavy laboured and rapid breathing will result in which of the following?

zoology respiration in living organisms respiration in human beings respiration and associated structures respiration in humans

  1. High ${CO _2}$ in blood

  2. High ${O _2}$ in atmosphere

  3. Low ${CO _2}$ in blood

  4. Low ${O _2}$ in blood

Show answer
Correct Option: C
Explanation:

Heavy laboured breathing is a sign of abnormal respiration and an increased effort to breathe. Rapid breathing or Tachypnea has seen the breathing rate in adult humans is greater than the normal 20 breaths per minute. This  breathing pattern reduces carbon dioxide in the blood due to increased rate or depth of respiration.