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PTP610S - PLANT PHYSIOLOGY - 2ND OPP - JUNE 2024 |
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nAmlBIA UnlVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF HEALTH,NATURAL RESOURCESAND APPLIEDSCIENCES
DEPARTMENTOF AGRICULTURALSCIENCESAND AGRIBUSINESS
QUALIFICATION:BACHELOROF SCIENCEIN HORTICULTURE
QUALIFICATIONCODE: 07BHOR
LEVEL: 7
COURSECODE: PTP610S
COURSENAME: PLANT PHYSIOLOGY
DATE:JULY2024
DURATION: 3 HOURS
MARKS: 100
SECONDOPPORTUNITY/SUPPLEMENTARY EXAMINATION QUESTION PAPER
EXAMINER(S) Dr Grace N. Kangueehi
MODERATOR: Prof Theo Wassenaar
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
PERMISSIBLEMATERIALS
1. Examination question paper
2. Answering book
THIS QUESTION PAPERCONSISTSOF 1 PAGE(Excluding this front page)
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QUESTION 1
1.1. Give three reasons why photoperiodism is important for plants?
(3)
1.2. Explain what is meant by differentiation, giving two examples.
(3)
1.3 List the three principal criteria by which an element can be judged essential or non-
essential to a plant.
(3)
1.4. Explain in detail the cohesion-tension theory.
(3)
1.5. What do you understand by the term cellular respiration?
(4)
[16]
QUESTION 2
2.1. Differentiate between the Symplastic and the Apoplastic pathway.
(4)
2.2. Differentiate between a plant cell and an animal cell, by listing the main difference
between the two cells.
(4)
2.3. Why is nitrogen important in plants and what do you understand by the term nitrogen
metabolism?
(5)
2.4. Discussthe pollination and fertilisation process in Angiosperms.
(5)
2.5. Vegetables can be classified in different categories, briefly discuss the classification by
climate and give an example of each.
(6)
[24]
QUESTION 3
3.1. List the two types of mycorrhizal fungi and explain how they facilitate nutrient (including
which nutrient is important in which fungi) uptake by plant roots. Also discuss nitrogen-fixing
bacteria in roots, giving an example.
(10)
3.2. Define water potential and explain how it is influenced by solutes, pressure, gravity, and
the matric potential.
(10)
3.3. Water deficit can have a negative impact on plant growth. In your own words, discuss the
morphological, physiological, biochemical and growth responses of plants to water stress.
(10)
3.4. Define plant catabolism and describe the three stages of catabolism in details.
(15)
3.5 Give an example of a C3, C4, and CAM plants and differentiate between their
photosynthetic pathways.
(15)
[60]
Final Marks: 100
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