FREE NEET Biology Practice MCQ Test: Respiration In Plants Exercise 1 Questions Answers With Detailed Explanations [PDF]

Answer: (c)

Krebs cycle (also called as tricarboxylic acid cycle, TCA) is amphibolic or having both catabolic and anabolic rates, for e.g. acetyl CoA entering the cycle is completely broken down to form $CO_{2}$ and hydrogen showing catabolic role. In anabolic role, acetyl CoA is related to synthesis and breakdown of fatty acids, steroids, carotenoids, terpenes and aromatic compounds.

Answer: (a)

Answer: (d)

Answer: (c)

Answer: (a)

Answer: (d)

Answer: (c)

During Krebs' cycle when succinic acid is oxidised to fumaric acid then the precipitation of FAD as electron acceptor occurs. It is the only Krebs' cycle oxidation that does not employ a pyridine nucleotide. In this, succinate is dehydrogenated by succinate dehydrogenase. This enzyme removes two hydrogen ions and two electrons from succinate and these are then used to reduce FAD to $FADH^2$ .

Answer: (b)

Alcoholic fermentation is a process in which molecules such as glucose etc are converted into cellular energy and thereby produce ethanol and carbon dioxide as metabolic waste products. During alcoholic fermentation, $NAD^{+}$ is produced when acetaldehyde is reduced to ethanol.

Answer: (c)

Answer: (d)

Answer: (a)

Answer: (c)

Answer: (c)

The ratio of the volume of $CO_2$ released to volume of $O_2$ absorbed in the respiratory process is termed as the respiratory ratio or Respiratory Quotient.

R.Q. = ${\text"Volume of" CO_2 \text"evolved"}/{\text"Volume of" O_2  \text"absorbed"}$

Value of R.Q. varies from one respiratory substrate to another, e.g., R.Q. of carbohydrates is equal to 1, R.Q. of lipids and proteins are less than 1, that of organic acid is greater than 1.

Answer: (c)

Answer: (d)

Answer: (a)

Answer: (d)

Answer: (d)

Answer: (a)

Answer: (b)