coordination in plants...coordination in plants y using their hormones or ohormones tal changes...

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Coordination in Plants Plants coordinate their behaviour by using their hormones or phytohormones and respond to the environmental changes Movement in Plants Geotropism Chemotropism Hydrotropism Thigmotropism Ex. Mimosa leaf, Venus Flytrap Thigmonasty Thigmonasty is the response of a plant to touch or vibration Ex. Sunflower, Dandelion flower Photonasty Movement of plant parts in response to light Movement of plants in response to chemicals Ex: The growth of pollen tube towards the ovule during fertilization in a flower Pollen Ovule Pollen tube Sperm nuclei Stigma Movement of plants in response to water Ex: Roots of a plant move towards water Directional movement of plants in response to the touch of an object Ex: Tendrils of a climber plant climb towards any support which they can cling upon Phototropism Movement of plants in response to light Ex. The shoot of the plant moves towards the light Movement of plants in response to gravity Positive Geotropism Roots of a plant move in a downward direction Negative geotropism Stem moves in the upward direction Tropic Movements Growth dependent (towards or away from a stimulus) (independent of stimulus's position) Nastic Movements Growth independent

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Page 1: Coordination in Plants...Coordination in Plants y using their hormones or ohormones tal changes Movement in Plants Geotropism Chemotropism Hydrotropism Thigmotropism Ex. Mimosa leaf,

Coordination in PlantsPlants coordinate their behaviour by using their hormones or phytohormonesand respond to the environmental changes

Movement in Plants

Geotropism

Chemotropism

Hydrotropism

Thigmotropism

Ex. Mimosa leaf, Venus Flytrap

ThigmonastyThigmonasty is the response of

a plant to touch or vibration

Ex. Sunflower, Dandelion flower

PhotonastyMovement of plant parts in

response to light

Movement of plants in response to chemicals

Ex: The growth of pollen tube towards the ovule during fertilization in a flower

Pollen

Ovule

Pollen tube

Sperm nuclei

Stigma

Movement of plants in response to water

Ex: Roots of a plant move towards water

Directional movement of plants in response to the touch of an object

Ex: Tendrils of a climber plant climb towards any support which they can cling upon

PhototropismMovement of plants in response to light

Ex. The shoot of the plant moves towards the light

Movement of plants in response to gravity

Positive Geotropism Roots of a plant move in a downward direction

Negative geotropism Stem moves in the upward direction

Tropic Movements Growth dependent

(towards or away from a stimulus) (independent of stimulus's position)

Nastic MovementsGrowth independent

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