AP BIOLOGY UNIT 7 MC

the most probable cause for the difference in mean stem length between plants in dish A and plants in dish B in which of the following?

elongation of seedlings in response to the lack of light

ethylene is an organic compound produced by ripening fruits. in a controlled experiment, researchers found that ethylene gas stimulated the ripening process in newly harvested fruits. which of the following describes the most likely connection between natural ethylene production and fruit ripening?

ethylene gas is a chemical signal through which ripening fruits triggers the ripening process in other fruits

according to the results of this experiment, germination of tobacco seeds during the first week is

increased by exposure to light

which of the following best supports the hypothesis that the difference in leaf color is genetically controlled?

the existence of yellow-leaved seedlings as well as green-leaved ones on day 14 in dish B

additional observations were made on day 21 and no yellow-leaved seedlings were found alive in either dish. this most likely happened because

yellow-leaved seedlings were unable to convert light energy to chemical energy