Which list correctly orders the events leading to leaf fall in deciduous trees?
A) formation of abscission layer, increase in ethylene levels, decrease in auxin levels
B) shortening days, increase in ethylene production, formation of abscission layer
C) shortening days, formation of abscission layer, decrease in ethylene levels
D) decrease in ethylene levels, shortening days, formation of abscission layer
Answer: B
You might also like to view...
PFK-1 is _________ by ATP and _________ by ADP
A. activated; activated B. activated; inhibited C. inhibited; activated D. inhibited; inhibited
Complement-fixing antibodies are those that function by:
a. attaching to the surface of pathogens and contributing to their destruction by the lytic action of complement. b. binding to and blocking surface receptors for host cells. c. attaching to the surface of pathogens and making the pathogens more amenable to ingestion by phagocytic cells. d. attaching to the surface of pathogens and contributing to their destruction by che-motaxis.
The vertical dive of a moth for cover when it hears the ultrasound chirps of an approaching bat is an example of a(n)
A. sign stimulus. B. innate releasing mechanism. C. kinesis. D. supernormal stimulus. E. fixed action pattern.
Ectopic thyroid tissue may be identified through biopsy due to the unique presence of:
A. Calcium Crystals B. Colloid C. Hassall's Corpuscles D. Smooth Muscle E. T-Cells