BBYCT-137 · June 2025 · English
IGNOU BBYCT-137 June 2025 Previous Year Question Paper
Plant Physiology And Metabolism
Structured previous year question paper for BBYCT-137, June 2025 session.
Max marks: 50 · Questions: 7
Verified: 29 Jul 2026
BACHELOR OF SCIENCE
(GENERAL)
(BSCG)
Term-End Examination
June, 2025
BBYCT-137 : PLANT PHYSIOLOGY AND
METABOLISM
Time : 2 Hours Maximum Marks : 50
Note : Question No. 1 is compulsory. Attempt
any four questions from Question
Nos. 2 to 7.
Q1.(a) State whether the following statements are TRUE or FALSE: 4x1=4 (@) The water potential in the xylem is less negative than that in soil water. Gi) Ammonia is produced in the mitochondrion via glycine dephosphorylation during the C2 cycle.
(iii) The production of fructose 1, 6- bisphosphate is an irreversible and regulatory step in glycolysis.
(iv) Coffea arabica is an obligate short- day plant.
(b) Fillin the blanks : 4x1=4
(6) At full turgor Yw of a cell will be .
(ii) Chemosynthetic bacteria utilize energy to synthesize food.
(ii) In cyanobacteria, nitrogenase is present in .
(iv) Phloem loading involves the translocation of photosynthetases from chloroplasts to .
(c) Match the items given under Column ‘A’ with those given in Column ‘B’ : AX%=2 Column A Column B
(6) Liebig
(1) 400-700 nm
(ii) Sciophytes
(2) Inhibitory effect of O2
(ii) Warburg’s
(3) Shade loving effect plants
(iv) PAR (Photo-
(4) Law of synthetically minimum active radiation)
Q2.Differentiate between the following pairs of terms : 4x2.5=10
(a) Imbibition and Plasmolysis
(b) Photophosphorylation and Oxidative phosphorylation
(c) Malate-Aspartate shuttle and Glycerol 3-phosphate shuttle
(d) Active and Passive ion uptake
Q3.(a) Discuss the photosynthetic mechanism operating in C4 plants with a well labelled diagram. 5
(b) Describe the concept of apparent free space and how it influences nutrient ion uptake.
Q4.(a) What is the significance of accessory pigments ? Provide an overview of carotenoids and carotenols. 5
(b) Explain cyclic photophosphorylation with a suitable diagram.
Q5.(a) Discuss briefly what you understand by competitive and non-competitive inhibition of enzymes. 5
(b) Discuss the structure and function of mitochondria with a suitable diagram.
Q6.(a) Describe how gibberellin hormone affects plant growth. 5
(b) Explain the mechanism of stomatal closure during water stress.
Q7.Write short notes on any four of the following : 4x2.5=10
(a) Water potential
(b) Nernst equation
(c) Respiratory quotient
(d) Functions of cytokinins in plant
(e) Heat Shock Proteins (HSPs) 4x1=4 4x2.5=10 ०-3262887८7-137 4x2.5=
(10)