You want to determine which part of a plant is actually sensitive to light for phototropism. which of the following would be a good first experiment? a. shine the light from one side only. b. then measure the auxin diffusing down the stem on the light areas. c. remove the apical tip and apply auxin before beginning light treatments. d. cover one part (for instance, the tip or base) before beginning light treatments.

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.