UNIVERSITY OF NAIROBI
SECOND SEMESTER EXAMINATIONS 2012/2013
SECOND YEAR EXAMINATIONS FOR THE DEGREE OF BACHELOR OF SCIENCE
SBT 204: PLANT STRUCTURE AND FUNCTION
DATE: JULY 13, 2010 TIME: 9.00 AM – 12.00 AM
INSTRUCTIONS
Answer ALL QUESTIONS from section A and any two from SECTION B
SECTION A
1.Describe the structure and function of plasmodesmata.
2.What are the functions of peroxisomes in plant cells.
3.What are the differences between multiple and aggregate fruits?
4.Differentiate between apical and lateral meristems; what are their functions?
5.Describe the effects of gibberellins abscicic acid hormones in germination and dormancy of seeds.
6.Describe briefly the role of ATP in a plant cell.
7.Name accessory pigments in a green plants and explain their role in photosynthesis.
8.Discuss the adaptive characteristics of halophytes.
9.Briefly describe the movement of water through the apoplastic and symplastic pathways.
10.Compare primary and secondary xylem.
SECTION B
1.Describe the Krebs’s cycle.
2.Discuss the factors that affect germination of seeds.
3.Discuss the mechanism that has evolved in some plants to overcome photorespiration.
4.Describe the structure and function of three main tissue systems in plants.