In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Download of CBSE Class 11 Biology Chapter 14 Case Study and Passage Based Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 11 Biology Respiration in Plants to know their preparation level.

In CBSE Class 11 Biology Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Respiration in Plants Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 11 Biology Chapter 14 Respiration in Plants

Case Study/Passage-Based Questions

Case Study 1:

The scheme of glycolysis was given by Gustav Embden, Otto Meyerhof, and J. Parnas, and is often referred to as the EMP pathway. In anaerobic organisms, it is the only process in respiration. Glycolysis occurs in the cytoplasm of the cell and is present in all living organisms.It is completed in two phases as preparatory phase and pay-off phase. In this process, glucose undergoes partial oxidation to form two molecules of pyruvic acid. In plants, this glucose is derived from sucrose, which is the end product of photosynthesis, or from storagecarbohydrates. Sucrose is converted into glucose and fructose by the enzyme, invertase, and these two monosaccharides readily enter the glycolytic pathway. Glucose and fructose are phosphorylated to give rise to glucose-6- phosphate by the activity of the enzyme hexokinase. This phosphorylated form of glucose then isomerises to produce fructose-6- phosphate. Subsequent steps of metabolism of glucose and fructose are same. The various steps of glycolysis are depicted in Figure. In glycolysis, a chain of ten reactions, under the control of different enzymes, takes place to produce pyruvate from glucose.

ATP is utilised at two steps: first in the conversion of glucose into glucose 6-phosphate and second in the conversion of fructose 6-phosphate to fructose 1, 6-bisphosphate. The fructose 1, 6-bisphosphate is split into dihydroxyacetone phosphate and 3-phosphoglyceraldehyde (PGAL). We find that there is one step where NADH + H+ is formed from NAD+ ; this is when 3-phosphoglyceraldehyde (PGAL) is converted to 1, 3-bisphosphoglycerate (BPGA). Two redox-equivalents are removed (in the form of two hydrogen atoms) from PGAL and transferred to a molecule of NAD+ . PGAL is oxidised and with inorganic phosphate to get converted into BPGA. The conversion of BPGA to 3-phosphoglyceric acid (PGA), is also an energy yielding process; this energy is trapped by the formation of ATP. Another ATP is synthesised during the conversion of PEP to pyruvic acid.

Pyruvic acid is then the key product of glycolysis. What is the metabolic fate of pyruvate? This depends on the cellular need.There are three major ways in which different cells handle pyruvic acid produced by glycolysis. These are lactic acid fermentation, alcoholic fermentation and aerobic respiration. Fermentation takes place under anaerobic conditions in many prokaryotes and unicellular eukaryotes. For the complete oxidation of glucose to CO2 and H2O, however, organisms adopt Krebs’ cycle which is also called as aerobic respiration. This requires O2 supply.

1.) ________________ is the end product of preparatory phase in glycolysis.

• a) Fructose 1, 6-bisphosphate
• b) Glyceraldehyde-3-phosphate
• c) Fructose 1, 6-diphosphate
• d) Glyceraldehyde-3-phosulphate

Ans:b) Glyceraldehyde-3-phosphate

2.) ________________ is the end product of payoff phase in glycolysis.

• a) Fructose 1, 6-bisphosphate
• b) Glyceraldehyde-3-phosphate
• c) 1, 3-bisphosphoglycerate
• d) Pyruvate

Ans: d) Pyruvate

3) Give the number of ATP molecules are used in preparatory phase of glycolysis

Ans: In preparatory phase of glycolysis two ATP molecules are used to produce two molecules of glyceraldehyde-3- phosphate from glucose.

4.) Name the common step which occurs in respiration in presence of oxygen and in absence of oxygen.

Ans: Glycolysis is the common step which occurs in respiration in presence of oxygen and in absence of oxygen.

5.) Write the chemical equation for first phase of glycolysis.

Ans: chemical equation for first phase of glycolysis:

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