When plants grow too close together a shade avoidance effect occurs in their canopy. What is the shade avoidance effect and what causes it?
What will be an ideal response?
The upper layer of leaves absorb 85-90 percent of PAR light striking
them and very little far-red light. Non-absorbed light is reflected or transmitted to
lower leaves in the canopy. Therefore, leaves inside the canopy are exposed to a
high level of far-red, but low level of red light. The proportionately high level of
far-red light to red light causes the shade avoidance effect. These plants respond
with longer stem internodes, smaller leaf area, and reduced branching.
You might also like to view...
A single-phase, half-wave SCR circuit is used to control the power consumption of an inductive load. The resistive component of the load is 5 ?. The source voltage is 120 V (rms). When the triggering angle is adjusted to 60o , the average current of the load is 6A. Calculate the following:
a. Average voltage across the load b. Conduction period in degrees
In a right triangle if the hypotenuse is 22 centimeters and one leg is 18 centimeters, what is the length to the nearest hundredth centimeter of the other leg?
What will be an ideal response?
Most TP sensors have how many wires?
A) 1 B) 2 C) 3 D) 4
What type of loads are imposed on a structure from a sudden gust of wind or from an earthquake?
A. dead B. dynamic C. live D. wind