Exam 38: Plant Developmental Responses to External and Internal Signals

Figure 38-2 ​ The plant in Row B of the accompanying figure demonstrates a photoperiodic response characteristic of

____ the synthesis of α-amylase is an enzyme that digests starch in the endosperm.

Differentiate between circadian rhythms and photoperiodism. Give examples of each. What regulates these responses?

Which statement about cryptochrome is false ?

In barley seed germination, which of the following is true?

When a plant responds to external stimuli, such as light, gravity, or touch by directional growth, these responses are referred to as

Which hypothetical hormone promotes flowering but has never been successfully isolated?

A circadian rhythm has a period that approximates a 12-hour cycle.

When Pfr absorbs far-red light, the Pfr is converted to Pr.

The purification and elucidation of the primary auxin's chemical structure was accomplished by

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?

What happens after the sun goes down?

Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and spindly rice plants?

Pr strongly absorbs light that has a wavelength of 730 nm.

Figure 38-1 ​ One conclusion that can be drawn from the accompanying figure is that a low ratio of auxin to cytokinin