LAKEHEAD UNIVERSITY EXAMINATION NRMT 5273 Fall Faculty of Natural Resources Management Subject Course No. Section Department Tree Ecophysiology I Q.L. Dang Course Title Instructor Tuesday, December 13, 2022 Exam Date: Exam Time & Duration TYPE OF EXAMINATION [ x ] FINAL [ ] MID TERM [ ] SPECIAL [ ] DEFERRED

This examination question paper [ x ] MAY [] MAY NOT

Be taken from the examination room.

Question 1 (10 marks) Explain how drought stress and an elevation of CO₂ concentration influence stomatal conductance Question 2 (10) Explain what happens in the process of cold hardening and how those changes protect plants from freezing damages Question 3 (10) Describe all possible plant responses to (1) dry air, (2) dry soil and (3) dry air and dry soil. Question 4 (10 marks) Explain how light and moisture affect the mesophyll to leaf surface area ratio and the physiological or ecological significance of the responses. Question 5 (5) Explain all the mechanisms for phloem loading and the driving force for the long-distance transport of photosynthates Question 6 (5) Explain why the plant cell will die when plasmolysis occurs. Question 7 (10) Discuss all mechanisms that plants use to respond to (1) high nutrient supply regimes and (2) poor nutrient supply conditions.