AP BIOLOGY

Detailed explanation-1: -So, the correct answer is ‘Light’.

Detailed explanation-2: -The majority of seeds grow most effectively in the dark. Light, which is essential for seedling growth, may actually hinder the germination process. The three primary and necessary conditions for a seed to germinate are water, oxygen, and temperature. Thus, Light is not necessary for a seed to germinate.

Detailed explanation-3: -Background: Light is one of the environmental factors that can influence dormancy. Some biologists consider seeds that require light to germinate to be photodormant. Others feel it is just one of many environmental factors (like temperature and water) that are necessary for germination.

Detailed explanation-4: -First, true enough, light isn’t necessary to germinate most seeds: the majority are perfectly capable of germinating in complete darkness. But there is a significant proportion of seeds that will not germinate if they aren’t exposed to light. This includes maybe a third of the plants we commonly grow from seed.