Q: Which of the following equations correctly represents the overall process of photosynthesis?

$$6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 1

Which of the following best describes a keystone species?

Accepted Answer

A species with a disproportionate effect on overall species diversity relative to its abundance.

Question 2

In the Paine experiment on the Washington intertidal ecosystem, what was the observed effect of removing the sea star Pisaster ochraceus?

Accepted Answer

The ecosystem collapsed, with a significant decrease in species diversity.

Question 3

Which of the following is an example of a trophic cascade as demonstrated in the Estes experiment with sea otters in the Aleutian Islands?

Accepted Answer

The removal of sea otters leads to an increase in sea urchins and a decrease in kelp forests.

Question 4

What is the primary role of apex predators in top-down ecosystem regulation?

Accepted Answer

They regulate the populations of species at lower trophic levels, maintaining ecosystem balance.

Question 5

If orcas begin preying on sea otters due to a decline in their usual prey, what is the likely ecological consequence in the kelp forest ecosystem?

Accepted Answer

Decrease in sea otter population, increase in sea urchins, and decline in kelp forests.

Question 6

Which of the following best defines an ecological footprint?

Accepted Answer

The amount of resources (land, water, fuel) required to support one person, measured in hectares.

Question 7

If everyone in the world had the same ecological footprint as the average U.S. citizen, what would happen to the Earth's carrying capacity?

Accepted Answer

It would decrease.

Question 8

Which of the following statements about fossil fuels and biofuels is correct?

Accepted Answer

Both derive their energy from photosynthesis, but fossil fuels come from ancient primary producers while biofuels come from modern ones.

Question 9

What is the main purpose of photosynthesis in biological systems?

Accepted Answer

To capture the energy of sunlight and convert it to chemical energy (sugars).

Question 10

Which of the following equations correctly represents the overall process of photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6O_2$$

Question 11

Where in the cell does photosynthesis primarily take place, and what pigment is essential for this process?

Accepted Answer

Chloroplasts; chlorophyll

Question 12

If a defect in photosynthesis blocked the Calvin cycle, which molecules would NOT be produced?

Accepted Answer

Sugars

Question 13

Which of the following best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in sugars, while cellular respiration releases that energy for biological processes.

Question 14

Which equation correctly represents cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}$$

Question 15

Which of the following is a key difference between first-generation and second-generation biofuels?

Accepted Answer

First-generation biofuels are produced from food crops, while second-generation biofuels are produced from cellulosic material such as wood and grasses.

Question 16

Which of the following actions would most effectively reduce your personal carbon footprint?

Accepted Answer

Switching to renewable energy sources and reducing meat consumption.

Question 17

Why are sustainable energy sources important for reducing CO$$_2$$ emissions?

Accepted Answer

They produce less or no CO$$_2$$ compared to fossil fuels.

Question 18

Which of the following is a real-world example of a trophic cascade?

Accepted Answer

The removal of wolves from Yellowstone leading to overpopulation of elk and decline of certain plant species.

Question 19

If a population's ecological footprint exceeds the biocapacity of its environment, what is the likely long-term outcome?

Accepted Answer

Resource depletion and environmental degradation will occur.

Question 20

Which of the following best describes sustainable development?

Accepted Answer

Development that meets present needs without compromising the ability of future generations to meet their own needs.

Keystone Species, Trophic Cascades, and Energy in Ecosystems

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