Which stimuli can plants detect? 

1Light.


2Gravity.


3Touch.


(there are others as well, like water)

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How do plant hormones act differently to human hormones?

Plant hormones only act locally, whereas human hormones travel throughout our bodies.  

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What is a tropism?

A tropism is a growth in response to a stimulus, which may lead to a change in the direction of a shoot or root. 

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What are auxins?

Auxins are a family of plant hormones. 

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Where in a plant are auxins made?

In the growing tips of the roots and shoots.

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What happens to auxins once they're produced?

They diffuse backwards along the root or shoot.

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What is a phototropism?

A tropism in response to light. 

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What is a gravitropism (also known as geotropism)?

A tropism in response to gravity.

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What effect do auxins have on plant shoots?

Stimulate cell/plant growth.

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What effect do auxins have on plant roots?

Inhibit cell/plant growth.

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Do auxins accumulate on the light or dark side of a shoot/root?

Light breaks down auxin, so there will be more auxin on the dark side.

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Do auxins accumulate on the top or bottom side of a shoot/root?

Gravity pulls auxins downwards, so there will be more auxin on the lower side.

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Are shoots positively or negatively phototropic? What does this mean?

Shoots are positively phototropic, which means they will grow towards the light.

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Are shoots positively or negatively gravitropic (geotropic)? What does this mean?

Shoots are negatively gravitropic, this means they will grow away from gravity (so upwards).

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Are roots positively or negatively phototropic? What does this mean?

Roots are negatively phototropic, which means they will grow away from the light.

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Are roots positively or negatively gravitropic (geotropic)? What does this mean?

Roots are positively gravitropic, this means they will grow towards gravity (so downwards).

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