Consumption in phytoplankton usually exceeds carbohydrate ...

[tichca]

Consumption in phytoplankton usually exceeds carbohydrate production which is why we end up with
  oxygen. Indicate whether the statement is true or false.

Question 2

Most phytoplankton stay near the surface to absorb red light. Indicate whether the statement is true or false.

[gcook]

Answer to Question 1

ANS: F
When phytoplankton photosynthesize, they also respire. They use some of the oxygen and carbon
dioxide they produce. Normally, carbohydrate production exceeds consumption. Information can be
found in the section Production Equals Consumption at the Compensation Depth.

Answer to Question 2

ANS: T
Red wavelengths are only able to penetrate to about 3 meters. This is why productivity is highest in the
top portion of the euphotic zone. Some Cyanobacteria can absorb blue light, allowing them to thrive at
deeper depths. Information can be found in the section Lack of Nutrients and Light Can Limit Primary
Productivity.