This hormone induces senescence of leaves and flowers, DIRECTLY.

What term is used for the situation where leaves are growing pointing downward because the cells on the upper side of the leaf petiole (stem) are growing faster than the cells on the lower side of the petiole?

What is a mechanism that allows heat tolerant species to acclimate to hot temperatures?

What is the term for plants that are salt sensitive?

Phytochrome is both a pigment and, in its active form, what kind of enzyme?

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.