Phototropism and Geotropism

Where are auxins made in the plant?

• In the growing tip of a stem or root

• In the older part of a stem or root

• All plant cells can make auxins

Which side of a stem contains more auxin?

• The shaded side

• The side in the light

• Both sides (shaded and non-shaded) contain the same amount of auxin

Tags

NGSS.MS-LS1-5

What happens when a root bends in the direction of the force of gravity?

• The top side grows more than the bottom side

• The bottom side grows more than the top side

• The top and bottom sides grow at the same rate

How can plant hormones be used to control fruit ripening?

• Plant hormones can only delay ripening

• Plant hormones can only accelerate ripening

• Plant hormones can speed up or slow down ripening

Which statement about plant stems is correct?

• They are positively phototropic and positively geotropic

• They are negatively phototropic but positively geotropic

• They are positively phototropic but negatively geotropic

Which statement about plant roots is correct?

• They are negatively phototropic and negatively geotropic

• They are negatively phototropic but positively geotropic

• They are positively phototropic but negatively geotropic

Which statement about auxins is correct?

• Can travel from one part of the plant to another

• They are only involved in responses to light

• They are only involved in responses to gravity

Tags

NGSS.MS-LS1-5

In a horizontal plant, Auxins __________ the growth of root cells on the lower surface and causes the upper surface to elongate more quickly.

• slows down

• speeds up

Tags

NGSS.MS-LS1-5

In a horizontal plant, Auxins __________ the growth of stem cells on the lower surface and causes the stem to bend upwards

• slows down

• speeds up

Which side of the root grows faster in one-side light?

• shaded side

• lighted side

Tags

NGSS.MS-LS1-5