If the GPP of a grassland is 5000 kcal/m2/year and 55 percent is used up by cellular respiration, what is the NPP? a. 2250 kcal/m2/year b. 2750 kcal/m2/year c. 5000 kcal/m2/year d. need more data

Video transcript

Hello everyone and welcome to today's video. So the net primary productivity of a forest is going to be 10,000 kilocalories per meter square per year. How much of these energy will be available to primary consumers? Remember that in this problem We're mostly talking about trophic levels. So let's visualize what is occurring here in this example. First of all, we have the primary producers at the bottom of of this foot chain which in this case is going to be the forest because their auto trough there, they're able to produce their own energy. We're told that this forest or these primary producers are able to produce 10,000 kilocalories per meter square per year of energy. So let's write that down here. However, when energy is transferred from one traffic level to another or from primary producers to primary consumers. As the question states only 10% of the available energy is Going to actually be transferred because of this. The energy that will actually be available to these primary consumers is 10% of these NPP which is going to be equal to 10,000 kg calories of energy. So that is going to be represented by answer choice B. That is the end of the video. I really hope this helped you