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Respiration in Organisms-III

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Which of the following is the most common respiratory substrate?

  1. Glucose

  2. Sucrose

  3. Maltose

  4. Glycogen


Correct Option: A
Explanation:

Glucose is the most common respiratory substrate.

Which of the following is/are the site(s) of glycolysis?

  1. Mitochondria

  2. Cytoplasm

  3. Endoplasmic reticulum

  4. Ribosomes


Correct Option: B
Explanation:

Cytoplasm is the site of glycolysis. 

Which of the following yield the highest energy per gram?

  1. Carbohydrates

  2. Proteins

  3. Fats

  4. Amino acids


Correct Option: C
Explanation:

Fats yield the highest energy per gram.

Why is aerobic respiration more advantageous than anaerobic respiration?

  1. Because it requires oxygen

  2. Because it produces more energy.

  3. Because it causes complete break down of respiratory substrate.

  4. Because it produces water.


Correct Option: B

Which of the following are called breathing roots?

  1. Pneumatophores

  2. Rhizoids

  3. Stomata

  4. Lenticels


Correct Option: A
Explanation:

Pneumatophores are called breathing roots.

Where are the respiratory enzymes located?

  1. Mitochondrial matrix

  2. Peri mitochondrial space

  3. Cristae

  4. Outer membrane


Correct Option: A
Explanation:

Respiratory enzymes are located in mitochondrial matrix of the cell. It is also called power house of the cell.

Which of the following processes is complementary to respiration?

  1. Circulation

  2. Photosynthesis

  3. Osmoregulation


Correct Option: B

The number of ATP molecules produced during aerobic and anaerobic respiration are _______ and ______ respectively.

  1. 2 and 34

  2. 2 and 30

  3. 0 and 2

  4. 38 and 2


Correct Option: D

Which of the following is a reactant in aerobic respiration?

  1. CO2

  2. O2

  3. H2O

  4. C6H12O6


Correct Option: B
Explanation:

Oxygen is a reactant in aerobic respiration. Oxygen enters the cell by diffusion. It is first transported to the cells via the red corpuscles. These contain haemoglobin, a transporter protein that carries oxygen to the cells of the body.

What is the vital capacity of lungs of an average human?

  1. 3000 - 4500 ml

  2. 4200 - 5500 ml

  3. 1500 - 1800 ml

  4. 500 - 1000 ml


Correct Option: A

Which of the following prevents collapsing of trachea?

  1. Muscles

  2. Diaphragm

  3. Ribs

  4. Cartilaginous rings


Correct Option: D

What happens if the thoracic wall is punctured?

  1. The lungs get inflated

  2. The man dies as the lungs get collapsed

  3. The breathing rate decreases

  4. The breathing rate increases


Correct Option: B
Explanation:

If the thoracic wall is punctured, the man dies as the lungs get punctured.

What happens to the diaphragm at the time of inspiration?

  1. expands

  2. contracts

  3. Relaxes

  4. Remains unchanged


Correct Option: B

Exchange of gases in lung alveoli occurs through

  1. active transport

  2. osmosis

  3. simple diffusion

  4. passive transport


Correct Option: C

What happens to the breathing rate, if the CO2 concentration in the blood increases?

  1. Increases

  2. Decreases

  3. Stops

  4. Remains unaffected


Correct Option: A

What happens to glucose during strenuous exercise?

  1. It is converted to glycogen.

  2. It is converted to pyruvic acid .

  3. It is converted to starch.

  4. It is converted to lactic acid.


Correct Option: D

Which of the following prevents entry of food in the wind pipe?

  1. Glottis

  2. Epiglottis

  3. Larynx

  4. Pharynx


Correct Option: B

Why the air that we exhale is warmed?

  1. As it passes through nasal cavities.

  2. As it passes through trachea.

  3. As it passes through alveoli.

  4. As it passes through bronchial arteries.


Correct Option: A

Which of the following diseases does not affect the lungs?

  1. Pneumonia

  2. Bronchitis

  3. Polio

  4. Asthma


Correct Option: C

Why does heavy exercise cause muscle cramps?

  1. Due to formation of lactic acid.

  2. Due to evolution of high concentration of CO2 .

  3. Due to formation of ethanol.

  4. Due to complete absence of oxygen in muscles.


Correct Option: A
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