Mung beans planted early in the spring produce flowers at the same time as mung bean plants planted early in the summer due to the a) age of the plant. b) length of darkness. c) amount of moisture. d) amount of fertilizer.

Option B

Explanation:

The mung beans is planted early in the spring season and produce flowers at the same time if it is planted in the early summer.

This is so because the time for which the seeds need sunlight is limited. The beans will get energy and light in the same amount even if it is planted at the starting of the summer season,.

This is due to the darkness that the beans receive when it is not being exposed to the sunlight and outer environment.

Hence, the correct answer is option B