2. A biologist examines the organelles present in the root cells, stem cells, and leaf cells of a green plant. She finds a high density of mitochondria and no chloroplasts in the root cells, but an abundance of mitochondria and an abundance of chloroplasts in the stem and leaf cells.

a. Explain the fact that all of the cells in the plant contain mitochondria, but not all of the cells contain chloroplasts. Explain how the availability of light affects this distribution. (3 points)

b. Predict the effect to the plant if the root cells suddenly acquired chloroplasts but lost all of their mitochondria. (3 points)