Tag: respiratory system

Questions Related to respiratory system

In aerobic respiration, the ultimate or final electron acceptor is:

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Atomic oxygen

  2. Molecular oxygen

  3. Cytochrome $a _3$

  4. Water

Show answer
Correct Option: A
Explanation:

In cellular respiration: NADH and FADH2 are converted to ATP through an electron transport chain with oxygen as the 'terminal electron acceptor'. Oxygen is the final electron acceptor. This is the only reason oxygen is required for living systems.

So, the correct option is 'Atomic oxygen'.

Which of the following processes is not related to the pathway of respiration which occurs in both aerobic and anaerobic respiration?

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Dehydrogenation of triose phosphate

  2. Substrate level phosphorylation

  3. Reduction of coenzyme $NAD^+$

  4. Release of Carbon dioxide

Show answer
Correct Option: B
Explanation:

Substrate level phosphorylation provides quicker, less efficient, source of ATP, independent of external electron acceptors.This is only present in human erythrocytes which have no mitochondria and in oxygen depleted muscle. 

Which one is product of aerobic respiration?

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Malic acid

  2. Ethyl alcohol

  3. Lactic acid

  4. Pyruvic acid.

Show answer
Correct Option: A
Explanation:

Glucose breakdown into pyruvic acid in the absence of oxygen and in the absence of oxygen pyruvic acid is converted into lactic acid even yeast in converted to ethyl alcohol in no-oxygen.

So the correct option is 'Malic acid'.

Which can readily respire without oxygen?

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Anabaena

  2. Saccharomyces

  3. Mushroom

  4. Fish

Show answer
Correct Option: B
Explanation:

Yeast possesses good fermentation potential in the absence of oxygen. Saccharomyces grow anaerobically (without oxygen) same as it grows in aerobically (with oxygen).

So the correct option is 'Saccharomyces'.

Mark the correct statement.

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Anaerobes grow in absence of oxygen.

  2. Aerophiles can grow in complete absence of oxygen.

  3. Aerobes can grow in absence of oxygen.

  4. Obligate anaerobes can live in the presence of abundant oxygen.

Show answer
Correct Option: A
Explanation:

The first statement is the correct one which say the organism grow with no oxygen is called as anaerobes.

So the correct option is 'Anaerobes grow in absence of oxygen'.

Which one yields the maximum energy?

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Krebs cycle

  2. Anaerobic respiration

  3. Glycolysis

  4. Aerobic respiration.

Show answer
Correct Option: D
Explanation:

Maximum number of ATP is generated per glucose molecule oxidation by aerobic respiration.

Glycolysis gives 2 ATP by  substrate-level phosphorylation and 2 NADH yields 6 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation, Transition Reaction gives 2 NADH yields 6 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation, citric acid cycle gives 2 ATP from substrate-level phosphorylation, 6 NADH yields 18 ATP (assuming 3 ATP per NADH) by oxidative phosphorylation, 2 FADH$ _2$ yields 4 ATP (assuming 2 ATP per FADH$ _2$) by oxidative phosphorylation. So the total maximum yield of ATP generated from one glucose molecule is 38 ATP: 4 from substrate-level phosphorylation; 34 from oxidative phosphorylation.
So the correct option is 'Aerobic respiration'.

Aerobic respiration occurs in 

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Mitochondria

  2. Peroxisomes

  3. Cytoplasm

  4. Cytoplasm and mitochondria

Show answer
Correct Option: D
Explanation:

Aerobic respiration occurs in the presence of oxygen. Glycolysis, Krebs' cycle and ETS are all stepwise processes of aerobic respiration. While glycolysis occurs in the cytoplasm, Krebs' cycle and ETS both take place in the mitochondria of the cell. 

So the answer is 'Cytoplasm and mitochondria'.

The respiratory process of yeast is

zoology respiratory system do plants breathe? plant respiration respiration-plants

  1. Rarely anaerobic

  2. Anaerobic

  3. Purely aerobic

  4. Both aerobic and anaerobic

Show answer
Correct Option: D
Explanation:

A unicellular organism like yeast can carry out both aerobic as well as anaerobic respiration depending on the environmental conditions. Anaerobic respiration is usually alcoholic fermentation and the end products are ethanol and carbon dioxide. Aerobic respiration produces CO$ _2$ and H$ _2$O as end products.

So, the correct answer is 'Both aerobic and anaerobic'.