All of the following are commonly accepted rules for determining whether an element is essential
EXCEPT ____.
a. a lack of the element stops plant growth or reproduction
b. a shortage of the element can only be corrected by supplying that element
c. the element needs only to be in trace supply
d. the element is directly involved in plant nutrition
C
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Current ____________________ are used to sense the amount of motor current.
Fill in the blank(s) with the appropriate word(s).
In ________ dormancy the radicle is not dormant, and it grows the first season; but the epicotyl is dormant and does not emerge until the second season.
Fill in the blank(s) with the appropriate word(s).
When is it necessary to prune groundcovers? How is pruning done?
What will be an ideal response?
Avoid exposing a lead-acid battery to _____
a. temperatures below 50°F (10°C) b. sparks or arcs of any type c. more than two hours of use each day d. nitrogen