You Plant a Seed into a Pot Containing Some Soil,and

Multiple Choice

You plant a seed into a pot containing some soil,and then add water and place the pot under a light.In the first week,before the seedling even emerged from the soil,carbon dioxide levels increased in the closed chamber.The developing plant was using which of the following as a source of energy during this first week?

A) sugars from the soil
B) water from the soil
C) starch from the seed
D) nutrients from the soil
E) light