Plant Responses to Environmental Stimuli Quiz

The responses of plants to environmental stimuli are called________.

• cytokinins

• gibberellins

• tropisms

• auxins

Predict the result for the experimental setting in the figure below:

• Roots would grow up out of the pot and then down towards the light

• The plant stem would grow up and roots would grow down

• The plant would start to bend over and grow downwards toward the light

• The plant would wilt and die

Which of the following hormones opposes the action of the auxin hormone in plants?

• Abscisic acid

• Cytokinine

• Ethylene

• Gibberellin

What is the phenomenon that is affecting the growth of the bean shoot in Figure 3?

• Gravitropism

• Phototropism

• Thigmotropism

• Oligotropism

• Chemotropism

Which of the following is the primary function of gibberellin hormones?

• Inhibition of flower development

• Involved in breaking seed dormancy

• Promotion of cell division and shoot growth

• Regulation of photosynthesis

Which of the following processes is regulated by Abscisic Acid (ABA) in response to environmental stress?

• Flowering

• Leaf expansion

• Stem elongation

• Stomatal closure

What is the primary role of Abscisic Acid (ABA) in plants?

• Enhancing leaf expansion

• Inhibiting seed germination

• Promoting flower development

• Stimulating seed germination