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Plant Adaptation
Adaptation
• What environmental conditions must plants, animals and humans adapt to?
means adjusting to specific environmental conditions or factors
Environmental conditions in Canada
Short summer; long extremely cold winter
Short , cool summer; cold winter
Hot summer; cold winter
Comparing leaf shape in three plants from three different
environments
Mini Activity
A B CCards
A B CEnvironmental condition
Environmental condition
Environmental condition
A B CCreate a collage
Name the environmental condition plant experiences. Why?
Name the environmental condition plant experiences. Why?
Name the environmental condition plant experiences. Why ?
How do the adaptations of this plant help it survive in this environment?
How do the adaptations of this plant help it survive in this environment?
How do the adaptations of this plant help it survive in this environment?
A B CCreate a collage
A B CCards
Hot, dry desert conditions
Wet, humid conditions, tropical rainforest
Nutrient poor soil
Reduced leaf size helps plant to avoid water loss
Leaf consume insects for extra nutrients
Leave shape lets rain runoff them easily, preventing fungi to grow on leaf surface
Plant adaptations in different environments throughout
Canada
1. Tundra
Description Plant adaptation Example: Image
Short summer; long, extreme cold winter
Plants grow close to the ground due to lack of nutrients in soil Some plants are covered with hair to avoid freezing
2. Temperate Rainforest
Description Plant adaptation Example: Image
Is it better to run or walk in the rain?
Ripening Bananas
Some people say putting bananas in a brown paper bag and sealing it will ripen the banana more quickly. Does it work?
Find out by experimenting at home
Plant Hormones Regulate Growth and Development
What are some of the advantages of humans understanding the functions of plant hormones?
1. What is a hormone? A hormone is any chemical produced in one part of the body that has a target elsewhere in the body. Plants have five classes of hormones
Name of Hormone What does it do? Where is it produced?
1.Auxin Buds or stem tips and roots
2.GibberellinsAnthers
3.CytokininsRoots, shoots
4.Abscisic Acid Leaves, chloroplasts
5.Ethylene Germinating seedlings
• Stimulate plant growth• Break dormancy cycle in
seeds and buds
• Stimulate plant growth and development
• Promote cell division• Delay ageing of fruit
and leaves
• Inhibits plant growth• Sends seeds and buds into
dormancy
• Promotes ripening of fruit
Name of Hormone How it is used in agriculture, forestry and urban forestry
Auxin Applied to cuttings to stimulate growth. By cutting off the terminal bud, gardeners can
promote the growth of side branches
Gibberellins Used by farmers to increase fruit size Used in brewery to stimulate germination in
barley seedsCytokinins
Used to grow clones of plants Used by florist to lengthen time cut flowers stay
fresh
Abscisic Acid Applied to greenhouse crops before transition to field to reduce shock from change in environmental condition
Ethylene Used to ripen large quantities of commercial
fruits after they arrive at sale destination
Ripening Bananas
Some people say putting bananas in a brown paper bag and sealing it will ripen the banana more quickly. Does it work?
Find out by experimenting at home
Bananas ripening occurs naturally
A chemical substance produced by plants causes ripening. What is this chemical substance generally called?
Knowing about hormones has helped in ripening bananas for___________________________purposes
How many classes of plant hormones did we talk about? Name some
biological phenomenon, indicating growth or turning movement of a plant in response to an environmental stimulus
What do you observe ?
Why ?
What do you observe ?
Why ?
What do you observe ?
Why ?
TROPISM
is a biological phenomenon, indicating growth or turning movement a plant does in response to an environmental stimulus
TROPISM
• POSITIVE
• If the plant moves TOWARD the stimulus
• NEGATIVE
• If the plant moves AWAY from the stimulus
Gravitropism
http://www.youtube.com/watch?v=mYZXax8V_L0&feature=related&safety_mode=true&persist_safety_mode=1
Movement of plants in response to gravity
Positive is toward gravity (roots grow down)
Negative is away from gravity (shoot, stems, and leaves grow up)
Why?Allows plants to grow properly and get nutrients and sunlight
Phototropism
Movement of plants toward light
Why?
Maximize amount of sun for photosynthesis to make their food.
Phototropismhttp://www.youtube.com/watch?NR=1&v=KQOC_bPrqFs&safety_mode=true&persist_safety_mode=1
Thigmotropism
http://www.youtube.com/watch?v=8HeedWWe6VA&feature=related&safety_mode=true&persist_safety_mode=1
Plants moving in response to touch.
Positive is toward touch (vines wrap around structures)
Negative is away from touch (some plants close up when touched)
Why?to support leaves as they grow higher to reach the sun to make more food (photosynthesis).