Plant Hormones

Plant Hormones

Multiple Choice

What are the steps in signal transduction in plants?

• Reception --> Response ---> Transduction

• Reception --> Transduction ---> Response

• Transduction ---> Response ---> Reception

• Response ---> Reception --> Transduction

Multiple Choice

The ability of plants to grow in the absence of light.

• De-etiolation

• Etiolation

• Sprouting

• Germination

Multiple Choice

Plant's response to light after a period of insufficient light exposure.

• De-etiolation

• Etiolation

• Sprouting

• Germination

Multiple Choice

Which is NOT a secondary messenger in the greening process in plants?

• cGMP

• Kinase

• Ca²⁺

Multiple Choice

Which photoreceptor is involved in the de-etiolation process?

• cytochrome

• phototropin

• phytochrome

• chlorophyll

General model for signal transduction pathways

An example of signal transduction in plants: the role of phytochrome in the de-etiolation (greening) response. 

Do Plants have Hormones?

Open Ended

Sunflowers got their name because they tend to turn and "follow" the sun throughout the day. Why do you think they do this and how?

Multiple Choice

You can buy products that help plants grow. Which hormone would be present in a product like this and why?

• ABA because it keeps seeds dormant

• Ethylene because it stimulates abscission of leaves

• Auxin because it stimulates roots to grow

• Gibberellins because they stimulate pollen tube growth

Multiple Choice

ABA, or Abscisic acid, would likely cause which of the follow to occur?

• Closing of stomata

• Cell elongation

• Tropisms

• Fruit ripening

Multiple Choice

Which of the following hormones is/are involved in the germination of seeds?

• Cytokinin

• Ethene

• Gibberellin

• All of these

Multiple Choice

Bananas are ripened by which hormone?

• Cytokinin

• ABA

• Ethene

• Gibberellin

Multiple Choice

Which hormone is most likely involved in Mitosis?

• Auxin

• Cytokinin

• ABA

• Ethene

Multiple Choice

Under certain conditions, seeds need to prevent growth of a new plant, for example, when there is a drought and a new plant would not survive. Which hormone is involved in making seeds dormant?

• Gibberellin

• Auxin

• Cytokinin

• ABA

Hormones and phototropism

Multiple Choice

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

• In the leaves of the plant.

• All plant cells can make auxins

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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

• shaded side

• lighted side

Open Ended

What do you think is the importance of the discovery of auxins?

Poll

I have understood the lessons today!