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).