MERU UNIVERSITY OF SCIENCE AND TECHNOLOGY
P.O. Box 972-60200 – Meru-Kenya.
Tel: +254 (0)799529958, +254 (0)799529959, +254 (0)712524293
Website: www.must.ac.ke Email:
University Examinations 2020/2021
SECOND YEAR, SECOND SEMESTER SPECIAL/SUPPLEMENTARY
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN AGRIC,
HORT, AGED,BED
SBA 3250: PLANT BIOCHEMISTRY AND PHYSIOLOGY
DATE: APRIL 2022 TIME: 2 HOURS
INSTRUCTIONS: Answer Question ONE and ANY OTHER TWO Questions
QUESTION ONE (30 MARKS)
a) Describe any two plant organelles and their functions (4marks)
b) Outline the general functions of lipids in plants (4marks)
c) Describe briefly the following:
i. Transpiration (2marks)
ii. Water potential (2marks)
d) Explain two physiological effects of auxins (4marks)
e) Distinguish between exogeneous and endogenous seed dormancy giving examples
(3marks)
f) Account for the importance of chlorophyll during photosynthesis (3marks)
g) Explain briefly the mass flow hypothesis (4marks)
h) Outline the differences between cyclic and non-cyclic photophosphorylation (4marks)
QUESTION TWO (20 MARKS)
a) Discuss root nodule formation (10marks)
b) Describe light reactions during photosynthesis (10marks)
QUESTION THREE (20 MARKS)
a) Discuss biological nitrogen fixation and its importance in agriculture (20marks)
Meru University of Science & Technology is ISO 9001:2015 Certified
Foundation of Innovations Page 1
P.O. Box 972-60200 – Meru-Kenya.
Tel: +254 (0)799529958, +254 (0)799529959, +254 (0)712524293
Website: www.must.ac.ke Email:
University Examinations 2020/2021
SECOND YEAR, SECOND SEMESTER SPECIAL/SUPPLEMENTARY
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN AGRIC,
HORT, AGED,BED
SBA 3250: PLANT BIOCHEMISTRY AND PHYSIOLOGY
DATE: APRIL 2022 TIME: 2 HOURS
INSTRUCTIONS: Answer Question ONE and ANY OTHER TWO Questions
QUESTION ONE (30 MARKS)
a) Describe any two plant organelles and their functions (4marks)
b) Outline the general functions of lipids in plants (4marks)
c) Describe briefly the following:
i. Transpiration (2marks)
ii. Water potential (2marks)
d) Explain two physiological effects of auxins (4marks)
e) Distinguish between exogeneous and endogenous seed dormancy giving examples
(3marks)
f) Account for the importance of chlorophyll during photosynthesis (3marks)
g) Explain briefly the mass flow hypothesis (4marks)
h) Outline the differences between cyclic and non-cyclic photophosphorylation (4marks)
QUESTION TWO (20 MARKS)
a) Discuss root nodule formation (10marks)
b) Describe light reactions during photosynthesis (10marks)
QUESTION THREE (20 MARKS)
a) Discuss biological nitrogen fixation and its importance in agriculture (20marks)
Meru University of Science & Technology is ISO 9001:2015 Certified
Foundation of Innovations Page 1
