9-1 Plant hormones

What term describes the responses made by plants to environmental stimuli?

Identify the hormone that controls growth near the tips of shoots and roots

• Gibberellin

• Auxin

• Ethene

• Thyroxine

What term describes plant growth in response to gravity?

Which of the following is a function of ethene?

• It can be used to alter dormancy

• It stimulates seed germination

• It induces flowering

• It stimulates the enzyme that causes fruit to ripen

Auxin can be used artificially for which of the following?

• As a selective weedkiller

• To induce flowering

• To stimulate dormancy

• For growing larger fruit

Which of the following is a response to light?

• Hydrotropism

• Gravitropism

• Phototropism

• Germination

Gibberellin can be used for which of the following??

• As a hormone in rooting powder

• To induce flowering

• To stimulate ripening of fruit

• As a selective weedkiller

State a procedure that can be used to grow clones of plants in a medium containing auxin and nutrients

In shoots auxin will cause which of the following?

• Growth inhibition

• Germination

• Cell elongation

• Flowering

Where in a plant is auxin produced?

• In flowers

• In dormant seeds

• In root tips

• In all cells