NCERT Class 11 Science — Chapter 2: Respiration in Plants

The Tricarboxylic Acid (TCA) cycle takes place in which part of the mitochondrion?

The alcohol concentration beyond which yeast cells cannot survive and fermentation ceases is approximately how much?

The immediate product formed from pyruvate before its entry into the citric acid cycle is:

What is the theoretical maximum net gain of ATP molecules from the complete oxidation of one glucose molecule in aerobic respiration?

Assertion (A): Oxygen plays a vital role in the early stages of the Krebs cycle. Reason (R): Oxygen acts as the final hydrogen acceptor in the electron transport system.

The hydrolysis of sucrose to glucose and fructose in the preparatory steps of glycolysis is catalysed by which enzyme?

Consider the following statements comparing fermentation and aerobic respiration: 1. Fermentation involves only partial breakdown of glucose. 2. Fermentation yields only two ATP molecules per glucose through glycolysis. 3. In fermentation, NADH is oxidised to NAD+ rather slowly compared to aerobic respiration. 4. Aerobic respiration completely degrades glucose to CO2 and H2O with higher ATP yield. Which of the statements given above are correct?

With reference to gas exchange in plants, consider the following statements: 1. Individual organs rely entirely on transport from other parts for gaseous needs. 2. Plant metabolism does not demand large-scale convective transport of gases. 3. Intercellular air spaces in parenchyma reduce diffusion distances. 4. In woody stems, living tissues occur in thin layers beneath the bark with openings that aid exchange. Which of the statements given above are correct?

In cellular metabolism, glycolysis occurs primarily at which site and in which set of organisms?

Consider the following statements about fermentation: 1. It releases less than seven % of the energy in glucose. 2. NADH is not oxidised to NAD+ during fermentation. 3. Yeasts tolerate alcohol concentration well above 20 %. 4. The process can be hazardous due to accumulation of acid or alcohol. Which of the statements given above are correct?

Assertion (A): Plants do not present great demands for gas exchange compared to animals. Reason (R): Each plant part takes care of its own gas-exchange needs, resulting in massive transport of gases from one part to another.

Match the enzyme with its specific action: List I | List II A. Hexokinase | 1. Converts Pyruvate to Acetyl CoA B. Invertase | 2. Reduces Pyruvate to Lactic acid C. Lactate dehydrogenase | 3. Splits Sucrose into Glucose and Fructose D. Pyruvate dehydrogenase | 4. Phosphorylates Glucose Select the correct answer using the code given below

Match the respiratory substrate/enzyme with its entry or action: List I | List II A. Fatty acids | 1. Degrade proteins B. Glycerol | 2. Enter pathway as Acetyl CoA C. Amino acids | 3. Enter pathway as PGAL D. Proteases | 4. Enter at various stages after deamination Select the correct answer using the code given below

Consider the following statements about anaerobiosis and glycolysis: 1. Some organisms are obligate anaerobes. 2. Some organisms are facultative anaerobes. 3. All living organisms lack enzymes to oxidise glucose without oxygen. 4. Breakdown of glucose to pyruvate is termed fermentation. Which of the statements given above are correct?

Which of the following metabolic processes is common to both prokaryotic and eukaryotic cells?

Consider the following statements: 1. Carbohydrates are the usual respiratory substrates. 2. Proteins and fats can never be used as respiratory substances. 3. Organic acids cannot serve as respiratory substrates. 4. Energy in respiration is released in multiple stepwise reactions. Which of the statements given above are correct?

From two molecules of pyruvic acid derived from one glucose, the oxidative decarboxylation step in mitochondria produces how many NADH molecules?

Consider the following statements explaining diffusion efficiency in bulky plant organs: 1. Most interior cells of stems are dead and provide mechanical support. 2. Living cells are arranged in thin layers near the surface and exchange gases through lenticels. 3. Long-distance transport of gases is minimal in plants. 4. Parenchyma packing is too tight to allow air spaces. Which of the statements given above are correct?

Assertion (A): The respiratory balance sheet calculation assumes that NADH produced in glycolysis is transferred to mitochondria. Reason (R): Glycolysis takes place within the mitochondrial matrix where the Krebs cycle occurs.

Which molecule serves as the primary energy carrier in cells?

Gaseous exchange in the woody stems of trees takes place primarily through:

The EMP pathway in cellular respiration refers to which of the following metabolic processes?

The electron transport chain (ETC) involved in oxidative phosphorylation is located in the:

The first stable compound formed in the Krebs cycle by the condensation of Acetyl CoA with Oxaloacetate is:

In eukaryotic cells, the enzymes for glycolysis are located in the:

In the mitochondrial electron transport chain, oxygen functions as the:

According to the chemiosmotic theory, approximately how many protons pass through the F0-F1 ATPase to synthesise one molecule of ATP?

Match the respiration context with its feature: List I | List II A. Yeast | 1. Site of Glycolysis B. Muscle cells (during heavy exercise) | 2. Site of Krebs’ cycle C. Mitochondria | 3. Produces Ethanol and CO₂ D. Cytoplasm | 4. Produces Lactic acid Select the correct answer using the code given below

The glycolytic pathway is often referred to as the EMP pathway, named after which set of investigators?