Secondary Plant Growth Factors

Which hormone is responsible for stimulating the breakdown of stored food to start the process of germination?

• Auxin

• Gibberellin

• Ethylene

• Cytokinins

Match the following plant hormones with their functions:

• Auxin

• Induces seed dormancy

• Ethylene

• Promotes cell growth and elongation

• Cytokinins

• Activates dormant buds

• Abscisic Acid

• Causes fruit to ripen

Tropism is when a plant moves in response to external stimuli. Which of the following is an example of tropism?

• A) Phototropism

• B) Hydrotropism

• C) Chemotropism

• D) All of the above.

Fill in the blank: (a)   will promote cell growth and cell elongation which will tell the plant to start growing from the terminal bud.

• Ethylene

• Auxin

• Gibberellin

• Abscisic Acid

When a plant creates too much ethylene, the plant can drop the leaves and (a)   .

• Flowers

• Fruit

• Seeds

• Roots

What is the main purpose of plant dormancy?

• To conserve energy during unfavorable conditions

• To increase growth rate

• To produce more flowers

• To attract pollinators

Match the following types of plants with their characteristics:

• Long-day plants

• Flower regardless of day length

• Day-neutral plants

• Flower when day length is 12 hours or less

• Short-day plants

• Flower when day length is 14 hours or greater

During winter dormancy, plants produce a hormone that signals them to (a)   .

• grow faster

• induce dormancy

• produce flowers

• increase photosynthesis

Day-neutral plants will flower once they have reached a (a)   .

• certain day length

• developmental age

• specific temperature

• high nutrient level