Plant Orientation

Which hormone controls cell growth in plants?

• Ghibberellin

• Auxin

• Ethylene

• Abscisic acid

Where is Auxin made?

• Meristem tissue

• Stem tissue

• Root tissue

• The buds

Auxin diffuses down the stem/root of the plant, and if there is more sun on one side it will diffuse:

• Away from sunlight (shady side of the plant)

• Towards sunlight (sunny side of the plant)

Tags

NGSS.MS-LS1-5

What does auxin do to cells in the shoot?

• Causes them to elongate

• Causes them to stay regular sized

• Inhibits their normal growth so they end up smaller

What does auxin do to cells in the root?

• Causes cells to elongate larger than normal

• Causes cells to stay regular sized, nothing happens

• Inhibits normal cell growth so the cells become smaller than normal

Tags

NGSS.MS-LS1-5

A stem bending toward sunlight is an example of:

• Negative phototropism

• Positive phototropism

• Positive phototaxis

• Negative phototaxis

A root bending down towards the direction of gravity is an example of:

• Positive geotaxis

• Negative geotaxis

• Positive geotropism

• Negative geotropism

A stem winding around a pole towards a sense of touch is an example of:

• Thigmonasty

• Positive thigmotaxis

• Negative thigmotropism

• Positive thigmotropism

A mimosa plant closing its leaves up when it is touched then flattening them back out later is an example of:

• Positive thigmonasty

• Thigmonasty

• Thigmotropism

• Positive thigmotropism

In geotropism, auxin diffuses:

• Towards the side that statoliths have sunk towards under gravity

• Away from the side that statoliths have sunk towards under gravity

Tags

NGSS.MS-LS1-5