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7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Structure and Function of theFlower
CXC Biology SyllabusLife Processes
Specific Objectives 9.6&9.7
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Section A:
Flower Structure
Science Objectives:Students should be able to
• Recognize specified floral parts on most flowers
• Relate each part to its function
• Distinguish between staminate, pistillate/carpellate andhermaphrodite flowers
Core Skills Objectives:• Co-operation/Group work
• Drawing
CXC Practical Skills
• Drawing
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Structure and Function of the Flower Quiz #1
1. What is the male part of the flower called?
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2. What is the main function of a flower?
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3. What is the function of the carpel?
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4. Give one example of a hermaphrodite flower
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5. Name the flower structures which protect the young flower bud.
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7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Use the following to label the flower diagram below:
Style, stamen, sepal, filament, peduncle, ovary, anther, receptacle, carpel,
stigma, petal, ovule.
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
What is a Flower?
• Plant organ for sexual reproduction
• Flowers produce gametes (sex cells)
•
Flowers are necessary for fertilisation tooccur
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Parts of the Flower
• Peduncle: flower stalk
• Receptacle: part of stalk bearing the floral organs, at base of flower
• Sepal:leaflike structures at flower base, protects young flower bud
• Calyx: all the sepals together form the calyx
• Petal: located inside and above the sepals, often large and colourful, sometimes
scented, sometimes producing nectar
•
Stamen: male part of the flower, consist of the anther and filament, makes pollen grains
• Pollen: grains containing the male gametes
• Pistil/Carpel: female part of the flower, consist of the stigma, style and ovary
• Ovule: located in the ovaries, carry female gametes
• Staminate flower: flower bearing only male parts
• Pistillate/Carpellate flower: flower bearing only female sex parts
• Hermaphrodite flower: flower bearing both male and female sex parts
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Method
1. Collect specimens of the following flowers (your guide willshow you where and which flowers to collect!)
•
Pride of Barbados• Hibiscus
• Orchid
• Flower of choice
2. Make a labeled drawing of the Pride of Barbados and Hibiscusflowers (use the flower diagram as a guide, includemagnification, labels in script)
3. Dissect the Pride of Barbados flower ( a demonstration will begiven)
4. Make individual drawings of the petals, sepals, stamens, and pistils/carpels
5. Dissect the pistil/carpel and make a labeled drawing of theovary and the ovules lying within it
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Section B
Pollination
Science Objectives:
Students should be able to:• Define pollination
• State the main ways in which plants achieve pollination
• Recognize flower adaptations associated with each mode
of pollinationCore Skills targeted
• Drawing
• Information Technology
CXC Practical Skills• Analysis and Interpretation
• Drawing
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
1. Insect-pollinated flowers may have:
• Brightly coloured petals
• Strong sweet fragrance
• Nectar producing glands
• Guidelines to lead insects to Nectar
Mode of Pollination
3. Bird-pollinated flowers may have:
• Long tube shaped flowers
• Bright red and yellow flowers
• No odour
2. Wind-pollinated flowers may have:
• Large stigmas outside the flower
•Little or no fragrance
• Light non-sticky pollen
• Lack showy petals
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Mode of Pollination (Continued)
5. Water-pollinated flowers may have:
•
Pollen which floats on water (this form of pollination is rare)
4. Mammal-pollinated flowers may
have:• White flowers
• Strong fruity odour
• Flowers opening at night
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Method
1. Research and define the following terms in the Iris
Bannochie library and on the Internet
• Pollination
• Self-pollination
• Cross-pollination
2. Note the ways in which pollination may occur
3. Identify the various adaptations associated with each
form of pollination
4. Collect flower specimens from the gardens and
determine their method of pollination through
completion of the Mode of Pollination Table
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Mode of Pollination Table
Flower
Name
Light non-
sticky Pollen
Sticky
Pollen
Colourful
Petals
Sweet
Scented
Tube
Shaped
Mode of
Pollination
denotes a positive response
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Assessment Scheme for Drawing
Element Criteria Sub-Total Total
Clarity Clean continuous lines of even thickness Any 3=2
No shading or unnecessary detail 2 marks
Reasonable size Any 2=1
Accuracy Faithfulness of reproduction 1
Structures typical of specimen included 1 3 marks
Reasonable proportions 1
Labeling/
Labeling lines
Neat drawn with a ruler; in pencil; not crossing
No arrowheads; touching labeled structure
1
Labels in script 1 2 marks
Labels accurate 1 mark
Acceptable title Accurate description of specimen
In caps Any 2=1 1 mark Below drawing
Magnification 1 mark
Total 10 marks
U th f ll i t l b l th fl di b l
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Use the following to label the flower diagram below:
Style, stamen, sepal, filament, peduncle, ovary, anther, receptacle, carpel,
stigma, petal, ovule.
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Structure and Function of the Flower Quiz #2 Pollination 1. Write a short definition for the word pollination.
2. Why is pollination important to plants?
3. State three ways in which pollination can be achieved.
4. State a plant adaptation associated with each mode of pollination above
7/28/2019 Structure and Function of the Flower PowerPoint (2)
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Andromeda Botanic GardensEducational Series: #2
Analysis and Interpretation of the Pollination Exercise
Background Information/Biological principles. (3 marks)
Relationship to Investigation/Observation.
•
State the significance of pollination• Identify the flower structures which play the key role in pollination
• Note how these structures are adapted to their role
Explanation/Interpretations of result. (3-4 marks)
•Give reasons for interpretation of specified result
Conclusion based on observation/data
Related to Aim (2 marks)
• Correct conclusions drawn
Limitations (1-2marks)
• Limitations of the results/conclusions stated