Plant Hormones and Responses

Hormone – chemical that affects the way an organism functions produced in one part of plant and transported to use in another part

Hormone – chemical that affects the way an organism functions produced in one part of plant and transported to use in another part Target Cells – the cells that a hormone affects to get a response

Parts of the plant most susceptible to hormones ____________– part of the plant that is still actively growing (shoot and root) ___________ – shoots or branches off to the side of the main stem _______ – Ripened ovary of an angiosperm

Parts of the plant most susceptible to hormones Apical Meristem – part of the plant that is still actively growing (shoot and root) _________– shoots or branches off to the side of the main stem ________ – Ripened ovary of an angiosperm

Parts of the plant most susceptible to hormones Apical Meristem – part of the plant that is still actively growing (shoot and root) Lateral Buds – shoots or branches off to the side of the main stem _______ – Ripened ovary of an angiosperm

Parts of the plant most susceptible to hormones Apical Meristem – part of the plant that is still actively growing (shoot and root) Lateral Buds – shoots or branches off to the side of the main stem Fruit – Ripened ovary of an angiosperm

Plant Hormones Auxin Elongates cells for stem growth Produced by apical meristem Triggers phototropism

Plant Hormones Auxin Cytokinins Elongates cells for stem growth Produced by apical meristem Triggers phototropism Cytokinins Promotes cells division and growth

Plant Hormones Auxin Cytokinins Gibberellins Elongates cells for stem growth Produced by apical meristem Triggers phototropism Cytokinins Promotes cells division and growth Gibberellins Causes seed germination (ends dormancy)

Plant Hormones Auxin Cytokinins Gibberellins Elongates cells for stem growth Produced by apical meristem Triggers phototropism Cytokinins Promotes cells division and growth Gibberellins Causes seed germination (ends dormancy) Abscisic Acid (Inhibitors) Prevents water loss by closing stomata Causes fruit dormancy Causes leaf fall

Plant Hormones Auxin Cytokinins Gibberellins Elongates cells for stem growth Produced by apical meristem Triggers phototropism Cytokinins Promotes cells division and growth Gibberellins Causes seed germination (ends dormancy) Abscisic Acid (Inhibitors) Prevents water loss by closing stomata Causes fruit dormancy Causes leaf fall Ethylene (Gas) Causes fruit to ripen Causes leaves to age

Tropism and Nastic Movement ______ – growth of a plant or part of a plant in response to a stimulus ________ – grows towards stimulus _______ – grows away from stimulus ______________– movement of a plant in response to a stimulus

Tropism and Nastic Movement Tropism – growth of a plant or part of a plant in response to a stimulus ________ – grows towards stimulus _______ – grows away from stimulus ____________– movement of a plant in response to a stimulus

Tropism and Nastic Movement Tropism – growth of a plant or part of a plant in response to a stimulus Positive – grows towards stimulus _______ – grows away from stimulus _____________– movement of a plant in response to a stimulus

Tropism and Nastic Movement Tropism – growth of a plant or part of a plant in response to a stimulus Positive – grows towards stimulus Negative – grows away from stimulus _____________– movement of a plant in response to a stimulus

Tropism and Nastic Movement Tropism – growth of a plant or part of a plant in response to a stimulus Positive – grows towards stimulus Negative – grows away from stimulus Nastic Movement – movement of a plant in response to a stimulus

Plant Responses ____________ – plants respond to light grow towards it _________________ – plants respond to gravity and grow against it (roots down, shoots up) ______________ – plants respond to touch and grow towards those structures in contact ______________ – plants respond to water and grow towards it

Plant Responses Phototropism – plants respond to light grow towards it _______________ – plants respond to gravity and grow against it (roots down, shoots up) ___________ – plants respond to touch and grow towards those structures in contact __________ – plants respond to water and grow towards it

Plant Responses Phototropism – plants respond to light grow towards it Geotropism/Gravitropism – plants respond to gravity and grow against it (roots down, shoots up) ___________ – plants respond to touch and grow towards those structures in contact ___________ – plants respond to water and grow towards it

Plant Responses Phototropism – plants respond to light grow towards it Geotropism/Gravitropism – plants respond to gravity and grow against it (roots down, shoots up) Thigmotropism – plants respond to touch and grow towards those structures in contact _____________ – plants respond to water and grow towards it

Plant Responses Phototropism – plants respond to light grow towards it Geotropism/Gravitropism – plants respond to gravity and grow against it (roots down, shoots up) Thigmotropism – plants respond to touch and grow towards those structures in contact Hydrotropism – plants respond to water and grow towards it

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

What type of tropism is this?

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