Which of the following is a product of photosynthesis?
a. carbon dioxide
b. sunlight
c. water
d. oxygen

Answer is D. 

Photosynthesis is a process which converts the energy in light into chemical energy in compounds. This process happens inside the living organisms which have chlorophylls. With the presence of sunlight and chlorophylls, organisms which can do photosynthesis produce glucose and oxygen as products by using carbon dioxide and water as materials. 

Reaction is 
6CO₂(g) + 6H₂O(l) → C₆H₁₂O₆(s) + 6O₂(g)

this protocol provides a detailed procedure for nucleoprotein extraction from cultured cells and tissues in an efficient manner.

"do a testcross with a homozygous recessive plant."