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Structure and Function of the Flower. CXC Biology Syllabus Life Processes Specific Objectives 9.6&9.7. Section A: Flower Structure. Science Objectives: Students should be able to Recognize specified floral parts on most flowers Relate each part to its function

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Structure and Function of the Flower


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structure and function of the flower

Structure and Function of the Flower

CXC Biology Syllabus

Life Processes

Specific Objectives 9.6&9.7

Andromeda Botanic Gardens Educational Series: #2

section a flower structure
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 and hermaphrodite flowers

Core Skills Objectives:

  • Co-operation/Group work
  • Drawing

CXC Practical Skills

  • Drawing

Andromeda Botanic Gardens Educational Series: #2

structure and function of the flower quiz 1
Structure and Function of the Flower Quiz #1
  • What is the male part of the flower called?

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  • What is the main function of a flower?

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  • What is the function of the carpel?

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  • Give one example of a hermaphrodite flower

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  • Name the flower structures which protect the young flower bud.

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Andromeda Botanic Gardens Educational Series: #2

slide4

Use the following to label the flower diagram below:

Style, stamen, sepal, filament, peduncle, ovary, anther, receptacle, carpel, stigma, petal, ovule.

Andromeda Botanic Gardens Educational Series: #2

what is a flower
What is a Flower?
  • Plant organ for sexual reproduction
  • Flowers produce gametes (sex cells)
  • Flowers are necessary for fertilisation to occur

Andromeda Botanic Gardens Educational Series: #2

flower diagram

Flower Diagram

Andromeda Botanic Gardens Educational Series: #2

parts of the flower
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

Andromeda Botanic Gardens Educational Series: #2

method
Method
  • Collect specimens of the following flowers (your guide will show you where and which flowers to collect!)
  • Pride of Barbados
  • Hibiscus
  • Orchid
  • Flower of choice
  • Make a labeled drawing of the Pride of Barbados and Hibiscus flowers (use the flower diagram as a guide, include magnification, labels in script)
  • Dissect the Pride of Barbados flower ( a demonstration will be given)
  • Make individual drawings of the petals, sepals, stamens, and pistils/carpels
  • Dissect the pistil/carpel and make a labeled drawing of the ovary and the ovules lying within it

Andromeda Botanic Gardens Educational Series: #2

section b pollination
Section BPollination

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 pollination

Core Skills targeted

  • Drawing
  • Information Technology

CXC Practical Skills

  • Analysis and Interpretation
  • Drawing

Andromeda Botanic Gardens Educational Series: #2

mode of pollination
Mode of Pollination
  • Insect-pollinated flowers may have:
  • Brightly coloured petals
  • Strong sweet fragrance
  • Nectar producing glands
  • Guidelines to lead insects to Nectar
  • Wind-pollinated flowers may have:
  • Large stigmas outside the flower
  • Little or no fragrance
  • Light non-sticky pollen
  • Lack showy petals
  • Bird-pollinated flowers may have:
  • Long tube shaped flowers
  • Bright red and yellow flowers
  • No odour

Andromeda Botanic Gardens Educational Series: #2

mode of pollination continued
Mode of Pollination (Continued)
  • Mammal-pollinated flowers may have:
  • White flowers
  • Strong fruity odour
  • Flowers opening at night
  • Water-pollinated flowers may have:
  • Pollen which floats on water
  • (this form of pollination is rare)

Andromeda Botanic Gardens Educational Series: #2

method1
Method
  • 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

Andromeda Botanic Gardens Educational Series: #2

mode of pollination table
Mode of Pollination Table
  • denotes a positive response

Andromeda Botanic Gardens Educational Series: #2

slide14

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

Andromeda Botanic Gardens Educational Series: #2

slide15

Use the following to label the flower diagram below:

Style, stamen, sepal, filament, peduncle, ovary, anther, receptacle, carpel, stigma, petal, ovule.

Andromeda Botanic Gardens Educational Series: #2

structure and function of the flower quiz 2 pollination
Structure and Function of the Flower Quiz #2 Pollination
  • Write a short definition for the word pollination.
  • Why is pollination important to plants?
  • State three ways in which pollination can be achieved.
  • State a plant adaptation associated with each mode of pollination above

Andromeda Botanic Gardens Educational Series: #2

analysis and interpretation of the pollination exercise
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

Andromeda Botanic Gardens Educational Series: #2