A student placed 20 tobacco seeds of the same species on moist paper towels in each of 2 petri dishes. Dish A was wrapped completely in an opaque cover to exclude all light. Dish B was not wrapped. The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and the opaque cover was permanently removed from dish A. Both dishes were returned to the light and examined again at 14 days. According to the results of this experiment, germination of tobacco seeds during the first week is

a. increased by exposure to light

b. unaffected by light intensity

c. prevented by paper towels

d. accelerated in green-leaved seedlings

Question

Keon Avery

Biology

12 January, 11:03

A student placed 20 tobacco seeds of the same species on moist paper towels in each of 2 petri dishes. Dish A was wrapped completely in an opaque cover to exclude all light. Dish B was not wrapped. The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and the opaque cover was permanently removed from dish A. Both dishes were returned to the light and examined again at 14 days. According to the results of this experiment, germination of tobacco seeds during the first week is

a. increased by exposure to light

b. unaffected by light intensity

c. prevented by paper towels

d. accelerated in green-leaved seedlings

+3

Answers (1)

Know the Answer?

Alexia Dalton · Answer 1

The correct answer is option A.

Explanation:

Tobacco seeds of the same species in this experiment placed in a controlled system except for the light exposure during the first week as petri dish A was covered or wrapped with moist paper while the petri dish B was not wrapped so the exposure of light affected the germination of the tobacco seeds.

As dish A was covered to exclude the light so that it has no impact of light exposure no matter for how long it was placed in the light whereas dish B has direct exposure to the light that affected the germination process.

Thus, the correct answer is option A.