Author Question: Why do the leaves of plants deficient in nitrogen turn yellow? A) It signals farmers to provide ... (Read 29 times)

tuffie · **on:** Aug 27, 2018

Why do the leaves of plants deficient in nitrogen turn yellow?

A) It signals farmers to provide additional fertilizer.
B) Plants deficient in nitrogen have a hard time producing chlorophyll.
C) Without nitrogen, the fluids in the plant turn acidic.
D) The nitrogen protects the plant from the sun's harmful ultraviolet rays.

Question 2

Thin-film photovoltaic cells are ________.

A) composed of crystalline silicon
B) easy to mass produce
C) sensitive to only narrow regions of the visible spectrum
D) very expensive to produce
E) none of the above