Exam 38: Plant Developmental Responses to External and Internal Signals

Jasmonic acid is structurally similar to ______ in animals.

The Grand Rapids variety of lettuce produces seeds that will not germinate unless they are exposed to light. Phytochrome is involved in this process in that exposure to red light stimulates germination, while far-red light inhibits germination. However, the effect of red light can be reversed by an immediate exposure to far-red light-and vice versa. You design an experiment in which you expose seeds of Grand Rapids lettuce first to red light, then immediately to far-red light, and then immediately to red light again. Would these seeds germinate? Use your knowledge of the phytochrome molecule to explain your reasoning. What if the seeds were exposed first to red light, then immediately to far-red light, then immediately to red light again, and then immediately to far-red light again?

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

A long day plant will flower when exposed to short nights.

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

Frits Went used tiny blocks of agar to show that ____ is made in the tip of _____.

Phototropins are light-activated kinases.

An example of a long-day plant is

In two sentences or less, explain what phytochrome and cryptochrome are, and how they differ.

Methyl salicylate triggers the genes that code for the systemic acquired resistance pathway.

The effect of red light on plants is to

Which of the following statements about plant hormones is false ?

When cytokinins are sprayed on leaves of a cut stem, the leaves become, or remain, yellow.

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