Respiration in Plants — Page 4 | NEET Biology

Q31

Out of 38 ATP molecules produced per glucose, 32 ATP molecules are formed from NADH and FADH2 in

A respiratory chain

B Krebs cycle

C oxidative decarboxylation

D EMP

Correct Answer

Option A

Solution

(a) NADH and FADH2 are oxidized in the respiratory chain (ETS) to produce ATP via oxidative phosphorylation.

Q32

In animal cells, the first stage of glucose breakdown is

A Krebs cycle

B glycolysis

C oxidative phosphorylation

D ETC

Correct Answer

Option B

Solution

(b) Glycolysis is the universal first step of glucose catabolism in all cells.

Q33

Fermentation products of Yeast are

A H2O + CO2

B methyl alcohol + CO2

C methyl alcohol + Water

D ethyl alcohol + CO2

Correct Answer

Option D

Solution

(d) Yeast fermentation: glucose → ethyl alcohol (ethanol) + CO2.

Q34

Fermentation is anaerobic production of

A protein and acetic acid

B alcohol, lactic acid or similar compounds

C ethers and acetones

D alcohol and lipoproteins

Correct Answer

Option B

Solution

(b) Fermentation produces alcohol, lactic acid, or similar compounds anaerobically.

Q35

Hexokinase inhibited by glucose-6-phosphate is an example of

A competitive inhibition

B non-competitive inhibition

C feedback allosteric inhibition

D positive feedback

Correct Answer

Option C

Solution

(c) End-product (glucose-6-phosphate) inhibits its own biosynthetic enzyme (hexokinase) — feedback allosteric inhibition.

Q36

Maximum usable energy per mol of glucose metabolised is generated during

A aerobic respiration by germinating seeds

B production of methanol by enteric bacteria

C fermentation into ethanol by yeast

D glycolysis in skeletal muscle

Correct Answer

Option A

Solution

(a) Aerobic respiration yields ~36 ATP vs only 2 ATP from anaerobic fermentation.

Q37

How many ATP molecules are produced by aerobic oxidation of one molecule of glucose?

A 2

B 4

C 36

D 38

Correct Answer

Option C

Solution

(c) Aerobic oxidation of glucose produces 36 ATP molecules (net).

Q38

In alcoholic fermentation

A oxygen is the electron acceptor

B triose phosphate is the electron donor while acetaldehyde is the electron acceptor

C triose phosphate is the electron donor while pyruvic acid is the electron acceptor

D there is no electron donor

Correct Answer

Option B

Solution

(b) In alcoholic fermentation: NADH donates electrons to acetaldehyde, reducing it to ethanol.

Q39

In glycolysis, during oxidation electrons are removed by

A ATP

B glyceraldehyde-3-phosphate

C NAD+

D molecular oxygen

Correct Answer

Option C

Solution

(c) NAD+ acts as the electron acceptor in glycolysis — converted to NADH.

Q40

How many ATP molecules could maximally be generated from one molecule of glucose if 686 kcal is released and each ATP contains 12 kcal?

A Thirty

B Fifty-seven

C One

D Two

Correct Answer

Option B

Solution

(b) 686/12 ≈ 57 ATP molecules maximally.