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PSF602S - PLANT STRUCTURE AND FUNCTION - 2ND OPP - JANUARY 2025 |
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nAml BIA UnlVERSITY
OF SCIEnCE AnDTECHnOLOGY
FacultyofHealth,Natural
ResourceasndApplied
Sciences
Schoolof NaturalandApplied
Sciences
Departmenotf Biology,
ChemistryandPhysics
13JacksonKau]euaStreet T: +264612072012
PrivateBag13388
F: +264612079012
Windhoek
E: dbcp@nust.na
NAMIBIA
W: www.nust.na
QUALIFICATION: BACHELOR OF SCIENCE
QUALIFICATIONCODE: 07BOSC
COURSE: PLANT STRUCTURE AND FUNCTION
DATE: JANUARY2025
DURATION: 3 HOURS
LEVEL:6
COURSECODE: PSF602S
SESSION: 1
MARKS: 100
SECOND OPPORTUNITY/ SUPPLEMENTARY: QUESTION PAPER
EXAMINER:
MODERATOR:
DR JEYA KENNEDY
PROF PERCY CHIMWAMUROMBE
INSTRUCTIONS:
1. Answer all questions on the separate answer sheet.
2. Please write neatly and legibly.
3. Do not use the left side margin of the exam paper. This must be allowed for the
examiner.
4. No books, notes and other additional aids are allowed.
5. Mark all answers clearly with their respective question numbers.
PERMISSIBLE MATERIALS:
1. Non-Programmable Calculator
ATTACHEMENTS
NONE
This paper consists of 4 pages including this front page
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Please answer ALL of the questions in this section.
47 MARKS
QUESTION 1: DISTINGUISH BETWEEN THE PAIRS OF THE FOLLOWING TERMS
[8]
Each answer carries two marks
1.1 Simple fruits and aggregate
1.2 Albuminous and exalbumnious seed
1.3 lntrafascicular and interfascicular cambium
1.4 Phytochromes and cryptochromes
QUESTION 2: SHORT QUESTIONS
[39]
The number of marks is given in brackets() at the end of each question
2.1 Name the four stages of embryogenesis in eudicots.
(2)
2.2 You observe necrotic lesions on the leaves of a plant in your garden. Are they more
likely caused by a hypersensitive response or to systemic acquired resistance (SAR)?
Explain your answer.
(2)
2.3 Phloem tissue is found in close association with xylem tissue. Explain the importance
of this close association.
(2)
2.4 Draw and label a diagram of an embryo sac.
(3)
2.5 The figure 1 below represent self-incompatibility pollination. Give a brief explanation
of each diagram.
(3)
Stigma
Pollen
\\
Style
Pollen--
....
tube
a
b
C
Figure 1
2
PLANTSTRUCTUREAND FUNCTION: PSF602S
2nd FIRSTOPPORTUNITY// SUPPLEMENTARYJ: ANUARY2025
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2.6 Name and describe the types of an inflorescences seen in figure 2.
(4)
I
Figure 2
2.7 What type of fruit is a cucumber, and how is the pericarp structured?
(3)
2.8 Differentiate between microsporogenesis and megasporogenesis.
(4)
2.9 Sketch the internal structure of a dicot seed and label its parts.
(5)
2.10 Discuss how flowers are classified based on floral asymmetry and
composition categories.
(5)
2.11 The table below contains diagrams of various methods of asexual reproduction.
Study the diagrams 3 and fill in the information in the table as required.
(6)
Diagram - 3
Name of
plant part
Explanation
of how a new
plant is
formed from
this plant
part
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PLANTSTRUCTUREAND FUNCTION: PSF602S
2nd FIRSTOPPORTUNITY// SUPPLEMENTARYJ: ANUARY2025
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l§p1_0N B: LONG ANSWER QUESTIONS
QUESTION 3: LONGER QUESTIONS
3.1 What is the stomata I apparatus? Explain the structure of stomata with a labelled
diagram.
(7)
3.2 Describe four types of root modifications that provide mechanical support to plants,
giving an example for each.
(8)
3.3 Explain the biological mechanism of auxin's role in gravitropism.
(8)
Please answer ANY TWO of the questions in this section C.
30 MARKS
QUESTION 4:
4.1 Explain why do plants abscise their leaves? Do all plants abscise their
leaves at once? Describe the important tissue and physiological changes
leading to leaf abscission.
(15)
4.2 Describe secondary growth in dicot roots.
(15)
4.3 Explain how do plants defend themselves from predators and respond to wounds?
(15)
END OF QUESTION PAPER
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PLANT STRUCTUREAND FUNCTION: PSF602S
2nd FIRSTOPPORTUNITY// SUPPLEMENTARY:JANUARY 2025