CHOOSE either the previous question about xerophytes or the question below.  For your answers, write the numbers 1 through 13 in order on separate lines, typing in what each numbered space represents (e.g.  1=?), then hitting return to give the next number in order and what it represents.  1. If you were to place a “sun plant” in the shade of a tree, how would you expect the plant to respond? 2. Why would this occur (due to what cause)? 3. By what specific mechanism would this occur (be very clear and detailed)? 4. Would you expect a “shade plant” to respond in the same way when placed in the shade of a tree?   5. Why or why not? 6. What size of seed would most likely require light for germination? 7. Why do you say that? 8. Conversion between the active and inactive forms of phytochrome is not 100% effective.  Why is this? 9 – 13.  Some plants are adapted to growing in hot, dry environments and do not experience as much stress under drought conditions.  Focusing on LEAF morphological modifications/adaptations, list and describe at least 5 different xeromorphic / xerophytic  traits, indicating how each of these traits help plants to survive in arid environments.

What is the name of the chemical signal that promotes flowering?

This hormone causes stomata to close.

This hormone causes an organ or region of the plant to become a “nutrient sink”.

Some synthetic forms of this hormone such as “2-4-D are sometimes used as an herbicide against dicots.

What is the cause of flooding DAMAGE in plants that are not adapted to wetland environments?

This hormone promotes the ripening of climacteric fruit by “turning on” some genes such as the gene for cellulase.

These hormones are synthesized from amino acids.

Which plant phytochrome responses requires the highest intensity of light and the longest period of exposure to light, and is involved in flowering?

Inhibitors of this hormone can be used to keep plants short and bushy.