Plant Growth Regulators

____________ cause faster growth.

• Inhibitor
• Promoter
• Reducer
• Response

Which PGR is a natural growth inhibitor?

• Auxin
• Gibberellin
• Cytokinin
• Abscisic Acid

Which tropism is a response to light?

• Lighttropism
• Phototropism
• Thigmotropism
• Hydrotropism

Chemical messengers that are produced in the plant and control growth.

• Hormones
• Tropisms
• Compounds
• Sugars

PGR that affects leaf aging and leaf drop.

• Auxin
• Cytokinin
• Gibberellin
• Ethylene

PGR that stimulates stem growth, cell elongation and cell division.

• Gibberellin
• Abscisic Acid
• Auxin
• Ethylene

Which one of these hormones does NOT stimulate plant growth?

• Ethylene

• Gibberellins

• Auxins

• Cytokinins

True or False: Gibberellins make stems taller

• True

• False

When you place a ripe banana next to a bunch of green bananas the green bananas will ripen and turn yellow faster than normal. This happens because the brown banana is releasing ______________, which signals the green bananas to accelerate the ripening process.

• Auxins

• Cytonkinins

• Gibberellins

• Ethylene

A water soluble gas that moves through the plant.

• Auxin
• Cytokinin
• Ethylene
• Gibberellin