Why does cells that carry out a lot of active transport often have many mitochondria?

In active transport particles move against a concentration gradient and therefore require energy which must be supplied by the cell.

Explanation:

In active transport, particles move against a concentration gradient and therefore require energy which must be supplied by the cell with the mitochondria, which is why there is a lot of it.

Explanation:

your answer is "the 1950's"

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.