1 which of the following statements is true a nutrients flow...

1. Which of the following statements is true? (A) nutrients flow in and out of the Earth's biosphere, (B) energy flows in and out of the biosphere, (C) no energy is lost as it passes from the sun to primary producers, (D) energy cycles within ecosystems in a closed loop, (E) energy and nutrients cycle the same way within ecosystems. 2. The only trophic group that receives nutrients and energy directly from all other trophic groups is (A) primary producers, (B) primary consumers, (C) secondary consumers, (D) tertiary consumers, (E) detritivores.

Transcript

00:01 All right.

00:02 So our first question is asking about energy and nutrient flows in an ecosystem.

00:10 So we just want to know for the first one, which of these statements is true.

00:18 And i guess just to do a little review of energy and nutrient cycling in ecosystems, first we need to remember that energy flows through an ecosystem while nutrients and matters cycles within it.

00:38 So that's the two, i guess the one big difference between talking about energy flows and nutrient cycling.

00:48 So we want to make sure that we know the difference between these two before we can answer this question.

00:53 So when energy enters an ecosystem, typically through sunlight, our primary producers or our plants convert this energy into biomass.

01:09 So if we have a sun here and it's going to our plants, the plants are consuming, or sorry, are producing that chemical energy and they are synthesizing it into their biomass.

01:31 And so we see this flow of energy, a one -way flow that goes from our sun to our producers and then all of our consumers, our primary, secondary tertiary consumers, as well as decomposers, acquire that energy throughout the food pyramid.

01:59 And so let's just start and go down the list here, and then we'll see which makes sense and which doesn't.

02:04 So the first answer is nutrients flow in and out of the earth's biosphere.

02:10 So based on what we just talked about as far as nutrients being cycling, which means that nutrients or matter is not created.

02:23 It's only recycled.

02:25 So like those atoms are combined into different molecules, whereas energy can enter via sunlight and actually leave in the form of heat.

02:37 So energy can come in and go out, but matter or nutrients is constantly being recycled and transformed through our ecosystem.

02:54 So we know that the first one, nutrients flow in and out.

02:59 That's not true.

03:00 It seems like b is probably our best bet, but let's just go down the list to make sure.

03:08 C is no energy is loss as it passes from the sun to primary producers.

03:14 While this step from the sun to the plants is the least, i guess, wasteful, there is.

03:24 There is, is still some energy that is lost.

03:27 So that's not true.

03:29 Next, we have energy cycles within ecosystems...

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