Objective Questions

Question. Respiration is a/an
(a) anabolic + exergonic
(b) catabolic + exergonic
(c) catabolic + endergonic
(d) anabolic + endergonic

Question. Cellular respiration includes the various pathways by which carbohydrates and other metabolites are broken down with the consecutive buildup of
(a) ATP
(b) protein
(c) vitamins
(d) none of these

Question. Glycolysis occurs in the ________ and produces________, which in the presence of O2 enters the____________.
(a) cytosol; pyruvate; mitochondrion
(b) cytosol; glucose; mitochondrion
(c) mitochondrion; pyruvate; chloroplast
(d) chloroplast; glucose; cytosol

Question. In which of the following reaction of glycolysis, a molecule of water is removed from the substrate ?
(a) Frucoste-6-phosphate → Fructose 1, 6-phosphate
(b) 3-phosphate glyceraldehyde → 1, 3-biphosphoglyceric acid
(c) PEP → Pyruvic acid
(d) 2-phosphoglycerate → PEP

Question. Conversion of phosphenol pyruvic acid to pyruvic acid and ADP to ATP are examples of
(a) photophosphorylation.
(b) oxidative phosphorylation.
(c) photoelectric phosphorylation.
(d) substrate level phosphorylation.

Question. Which one of the following process releases a carbon dioxide molecule?
(a) Glycolysis
(b) Lactic acid fermentation
(c) Alcohol fermentation
(d) Hydrolysis of glycogen

Question. In an anaerobic condition, yeast cells breakdown glucose into
(a) CO₂ + H₂O
(b) C₂H₅OH and CO₂
(c) CO₂ + lactic acid
(d) CO₂ + pyruvic acid

Question. Which of the following are not used in the conversion by pyruvate to acetyl CoA?
(i) Oxidative dehydrogenation
(ii) Oxidative dehydration
(iii) Oxidative phosphorylation
(iv) Oxidative decarboxylation
(a) (i), (ii) and (iii)
(b) (i) and (ii)
(c) (ii) and (iv)
(d) (i) and (iii)

Assertion/Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion : Glycolysis occurs in cytoplasm.
Reason : Enzymes for glycolysis are found in cytoplasm.
It is common in aerobic/anaerobic respiration.

Question. Assertion : Stomata are absent in submerged hydrophytes.
Reason : Respiration occurs by means of air chambers in submerged plants.

Question. Assertion : The inner membrane of mitochondria contains systems involving electron transport.
Reason : The mitochondrial matrix contains enzymes of Kreb’s cycle.

Critical Thinking Type Questions

Question. The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
(a) high energy bonds are formed in mitochondrial proteins.
(b) ADP is pumped out of the matrix into the intermembrane space.
(c) a proton gradient forms across the inner membrane.
(d) there is a change in the permeability of the inner mitochondrial membrane toward adenosine
diphosphate (ADP).

Question. Cytochrome oxidase contain
(a) Fe
(b) Mg
(c) Zn
(d) Cu

Question. In some succulent plants like Opuntia the R. Q. is zero because
(a) CO₂ is released without any absorption of O₂.
(b) O₂ is absorbed but CO₂ is not released.
(c) there is often compensation point in these plants due to thick phylloclades.
(d) none of the above

Question. Which one of the following is not included in glycolysis ?
(a) Substrate level phosphorylation occur.
(b) The end products are CO₂ and H₂O.
(c) ATP is formed.
(d) ATP is used.

Question. The expressions given below shows the summary equations I, II and III.

Categorise the summary equations under respective phases.

Question. The common phase between aerobic and anaerobic respiration is called
(a) tricarboxylic acid cycle
(b) Oxidative phosphorylation
(c) Embden, Meyerhof, Parnas cycle (Glycolysis)
(d) Fermentation

Question. In respiration, largest amount of energy is produced in
(a) anaerobic respiration
(b) Krebs’ cycle
(c) glycolysis
(d) none of the above

Question. Which of the following processes make direct use of oxygen?
(a) Glycolysis
(b) Fermentation
(c) Electron transport
(d) Krebs citric acid cycle

Question. Oxidative phosphorylation refers to
(a) anaerobic production of ATP.
(b) the citric acid cycle production of ATP.
(c) production of ATP by chemiosmosis.
(d) alcoholic fermentation.