BOT 410 Plant Pathology 2 CA 2024

Extrait du sujet

1. a.

   Define Plant hormones and Briefly explain how gibberellins can induce seed germination (3 marks) b) Discuss the implication of Brassinosteroic acid in the differentiation of xylem (4 marks) c) List two physiological roles of Cytokinins and explain the implication of auxin and Cytokinins in nutrient uptake (5 marks) d) Base on their mechanism, briefly describe the different type of plant movement (3 marks)

2. a.

   After defining flowering, describe three stages in the setting of the flower (4 marks) b) Discuss the use of ethylene in the ripening of fruit. (6 marks) c) What is phytochrome? Make a brief comment on the different forms of phytochrome (5 marks) d) On the basis of photoperiodism, describe the different groups of plants. (5 marks)