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

[tuffie]

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

[fwbard]

Answer to Question 1

B

Answer to Question 2

B

[tuffie]

TYSM

[kilada]

Excellent