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




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




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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Use the following to label the flower diagram below:

Style, stamen, sepal, filament, peduncle, ovary, anther, receptacle, carpel,

stigma, petal, ovule.




What is a Flower?

• Plant organ for sexual reproduction

• Flowers produce gametes (sex cells)

•

Flowers are necessary for fertilisation tooccur




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




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




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




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




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




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




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




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




Use the following to label the flower diagram below:

Style, stamen, sepal, filament, peduncle, ovary, anther, receptacle, carpel,

stigma, petal, ovule.




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




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

structure and function of the flower powerpoint (2)

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