Chapter 46, Ecosystem Ecology Video Solutions, Biology: How Life Works

01:35

Problem 1

Why does the coupling of photosynthesis and respiration result in the cycling of carbon?

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01:38

Problem 2

Draw and explain the curve representing the changing atmospheric levels of $\mathrm{CO}_{2}$ over the course of a year.

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02:05

Problem 3

Draw and explain the curve representing the changing atmospheric levels of $\mathrm{CO}_{2}$ over the past 150 years.

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01:55

Problem 4

The graph in Fig. 46.3 suggests that human activities have influenced $\mathrm{CO}_{2}$ levels in the atmosphere. What is one line of evidence that lends support to this hypothesis?

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01:49

Problem 5

Draw and explain the curve representing changing atmospheric levels of $\mathrm{CO}_{2}$ over the last 400,000 years.

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01:34

Problem 6

How do geologic processes participate in the long-term carbon cycle?

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01:39

Problem 7

If plate tectonic processes form a chain of high mountains, would you expect atmospheric $\mathrm{CO}_{2}$ to increase or decrease?

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02:08

Rates of respiration are known to vary positively with temperature. As increasing $\mathrm{CO}_{2}$ causes temperatures at the Earth's surface to rise, would changing rates of respiration tend to exacerbate or dampen this rise?

Vivek Singh

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01:48

Problem 9

How does a food web that diagrams the movement of carbon through an ecosystem also show how energy is transferred from one organism to the next?

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01:56

Problem 10

Biomass generally declines substantially as we move upward from one trophic level to the next in a trophic pyramid. This pattern was discussed in this section in terms of energy loss from one level to the next, but carbon must be lost as well. What happens to it?

Vivek Singh

Numerade Educator

01:35