Respiration in Plants MCQs

Statements regarding sucrose handling in plants before glycolysis:

I. Sucrose is converted into glucose and fructose by the enzyme invertase.
II. Glucose and fructose enter glycolysis through separate, unrelated metabolic pathways.
III. Glucose is phosphorylated to glucose-6-phosphate by hexokinase.
IV. Fructose requires no phosphorylation before entering the glycolytic pathway.

Which of the above statements are correct?

Regarding cellular respiration in green vs non-green plant cells:

I. Green cells photosynthesize and generate their own food locally.
II. Non-green cells rely on food translocated from photosynthetic tissues.
III. Roots contain chloroplasts and carry out photosynthesis during daytime.
IV. Non-green tissues undergo respiration to produce ATP for survival.

Which option gives the correct combination?

Consider the following statements about overall combustion reaction of glucose:

I. Complete combustion yields CO₂, H₂O, and energy.
II. All released energy is trapped as ATP without any heat loss.
III. Oxygen is required for complete combustion of glucose.
IV. Combustion occurs without any enzyme involvement in vitro.

Which statements are correct?

Read the statements regarding facultative and obligate anaerobes:

I. Facultative anaerobes can respire aerobically when oxygen is present.
II. Obligate anaerobes are killed or inhibited by molecular oxygen.
III. Both facultative and obligate anaerobes carry out glycolysis.
IV. Glycolysis requires molecular oxygen in facultative anaerobes.

Which statements are correct?

Statements regarding respiratory structures in plants:

I. Stomata are present on leaves and young stems for gas exchange.
II. Lenticels are permanent openings in the bark of woody stems.
III. Both stomata and lenticels actively pump O₂ inside using ATP.
IV. Gas exchange through stomata and lenticels occurs primarily by passive diffusion.

Which option represents correct statements?

Consider the following statements about Glycolysis:

I. The term glycolysis originates from Greek words glycos (sugar) and lysis (splitting).
II. Scheme of glycolysis was given by Embden, Meyerhof, and Parnas.
III. It is the only process of respiration in obligate anaerobes.
IV. Glycolysis occurs in the mitochondrial matrix of eukaryotic cells.

Which of the above statements are correct?

Read the following statements regarding ATP investment steps in glycolysis:

I. Conversion of Glucose to Glucose-6-phosphate consumes one ATP molecule.
II. Conversion of Fructose-6-phosphate to Fructose-1,6-bisphosphate consumes one ATP molecule.
III. Conversion of PGAL to 1,3-bisphosphoglycerate consumes one ATP molecule.
IV. Conversion of PEP to Pyruvic acid consumes two ATP molecules.

Which of the above statements are correct regarding ATP consumption?

Regarding reduction equivalents formed in glycolysis:

I. NADH + H⁺ is formed during conversion of PGAL to 1,3-bisphosphoglycerate (BPGA).
II. Two hydrogen atoms (redox equivalents) are transferred to NAD⁺ per PGAL molecule.
III. Conversion of BPGA to 3-PGA produces NADH + H⁺.
IV. One molecule of glucose yields two molecules of NADH + H⁺ in glycolysis.

Which statements are correct?

Consider the substrate-level phosphorylation steps in glycolysis:

I. 1,3-bisphosphoglycerate (BPGA) to 3-phosphoglyceric acid (PGA).
II. Phosphoenolpyruvate (PEP) to Pyruvic acid.
III. Fructose-6-phosphate to Fructose-1,6-bisphosphate.
IV. Glucose to Glucose-6-phosphate.

Which of the above steps generate ATP directly?

Which of the following statements about intermediate molecules of glycolysis are correct?

I. Fructose-1,6-bisphosphate splits into DHAP and PGAL.
II. DHAP and PGAL are 3-carbon triose phosphate isomers.
III. Pyruvic acid is a 4-carbon organic keto acid.
IV. Glucose-6-phosphate is an isomer of Fructose-6-phosphate.

Select the correct combination.