Exam 38: Plant Developmental Responses to External and Internal Signals

Unripe green fruits ripen quickly in supermarkets or commercial storage facilities after exposure to:

Any response of a plant to the relative lengths of light and darkness is referred to as:

Pr strongly absorbs light having a wavelength of 730 nm.

You want to obtain the strongest phototropic response from a shoot. Which wavelength of light should you use?

Plants compete for light, a response known as ____, in which plants tend to grow taller when closely surrounded by other plants.

Auxin produced by the apical meristem inhibits the germination of lateral buds.

____ stimulates rapid elongation of a floral stalk in many plant species.

Figure 38-1 Based on the data in the accompanying figure, the condition that results in root development is:

Which hormone stimulates both leaf abscission and fruit ripening?

Which of the following would be the most likely consequence of removing the apical meristem from a plant?

In a hypersensitive response, ____.

The site of gravity reception in roots is the:

You plant two gardens, one in the sun and one in the shade. The plants grown in the shade will most likely be ____ because neighboring leaves absorb more ____.

Summarize the effects of each of the six classes of plant hormones.

What hormone promotes apical dominance in plants?

Which statement about the internal biological clock is false ?

Figure 38-2 Refer to the accompanying figure. What does the photoperiodic response of the plant in Row A suggest?

In the mechanism of action for auxin, after auxin binds with its receptor, which of the following happens next?

An example of a short-day plant is:

____ used tiny blocks of agar to show that auxin is made in the tip of coleoptiles and still capable of influencing bending of the coleoptile.