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PTP610S - PLANT PHYSIOLOGY - 1ST OPP - JUNE 2025 |
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nAm I BIA un IVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTY OF HEALTH, NATURAL RESOURCES AND APPLIED SCIENCES
DEPARTMENT OF AGRICULTURAL SCIENCES AND AGRIBUSINESS
QUALIFICATION: BACHELOR OF SCIENCE IN HORTICULTURE
QUALIFICATION CODE: 07BHOR
LEVEL: 7
COURSE CODE: PTP610S
COURSE NAME: PLANT PHYSIOLOGY
DATE: JUNE 2025
DURATION: 3 HOURS
MARKS: 100
FIRST OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER(S) Dr Grace N. Kangueehi
MODERATOR: Dr Maliata Wanga
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
PERMISSIBLE MATERIALS
1. Examination question paper
2. Answering book
THIS QUESTION PAPER CONSISTS OF 1 PAGE (Excluding this front page)
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QUESTION 1
1.1. How do plants adapt to environmental stress?
{3)
1.2. Give three reasons why photoperiodism is important for plants?
{3)
1.3. Explain what is meant by differentiation, giving two examples.
(3)
1.4. Differentiate between the symplastic and the apoplastic pathway.
(3)
1.5. What is the difference between anaerobic and aerobic respiration in plants?
(5)
[17]
QUESTION 2
2.1. What is the importance of soil pH for plant growth?
(5)
2.2. Explain how water is transported from the roots to the leaves of a plant, including the
role of transpiration.
(5)
2.3. Describe hydroponics and point out the significance of the system.
(5)
2.4. Give a brief description of stomata and explain the mechanism of stomata I movement.
{8)
2.5. Differentiate between C3 and C4 plant photosynthetic pathways by indicating five
differences.
{10)
[33]
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 plant catabolism and describe the three stages of catabolism in details.
(10)
3.3. Describe the factors affecting the rate of transpiration.
(10)
3.4. Discuss the forms in which nitrogen is absorbed by the plants, its physiological role and
how the deficiency can be identified in plants.
{10)
3.5. Explain the role and applications of auxin in agriculture and horticulture.
{10)
[50]
Final Marks: 100
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