Exam 38: Plant Developmental Responses to External and Internal Signals

Which hormone promotes cell division and delays senescence in plants?

Naphthalene acetic acid is a synthetic ____ that stimulates root development on stem cuttings and is used extensively in asexual propagation.

Which hormone promotes cell elongation by changing plant cell walls so that they can expand due to the force of turgor pressure?

An example of a short-day plant is

The photoreceptor for photoperiodism and some other light-initiated plant responses is a group of blue-green pigments named

The "stress hormone" involved in stomatal closure during water stress is

Gibberellins are also involved in _____, the rapid elongation of a floral stalk that occurs naturally in many plants when they initiate flowering.

The herbicides (weed killers) 2,4-D and 2,4,5-T are examples of synthetic

For Arabidopsis and many other plants, ______ and ______ are implicated in resetting the biological clock.

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

In which organism is phytochrome not found?

_____ activates transcription of the gene for the small subunit of ______, an enzyme involved in photosynthesis

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