Unique Tropism of Plants

By: Annie, Marcos, Joe, Liz

Tropism in plants

are a growth or movement in response to a direct stimulus

What is Tropism in Plants ?

Positive = the plant, or a part of it,

grows in the direction from which the stimulus came from.

Negative = growth away from the stimulus.

Negative and positive response to tropism

Any Change in an organisms

environment that causes the organism to react

It’s a fancy way of saying “CAUSE “

What is a Stimulus

Plants are unable to be relocated if they

happen to start growing were condition are right.

however plants can alter their growth so they can grow in more favorable conditions

they do this by detecting were conditions are right they altar their growth by using their tropisms.

Why plants use tropisms ?

Hydrotropism Gravitropism Phototropism Thingmotropsim

Types of Tropisms

Hydrotropism is

movement or growth in response to moister or water

Hydro- prefix for water so the roots grow toward water

Ex- pea plant

Hydrotropism

Gravitropism is movement

or growth in the response to growth

Gravi- is a prefix relating to gravity, so the roots will grow downward while the plant grows upward

Ex- topsy turvy

Gravitropism

Phototropism is

movement or growth in response to light

Photo-, is a prefix relating to light, so things will grow toward the sun or light source.

Ex- Sun flower

Phototropism

Thingmotropsi

m is movement or growth in response to touch

Ex- sweat pea

Thingmotropsim

~Examples~

Phototropism

Thingmotropsim

Gravitropism

Hydrotropism