Question 1

Which of the following best describes the main difference between C3 and C4 photosynthetic pathways in plants?

Accepted Answer

C3 plants fix CO$$_2$$ directly through the Calvin cycle, while C4 plants initially fix CO$$_2$$ into a four-carbon compound before entering the Calvin cycle.

Question 2

A cheetah chasing a gazelle is an example of which type of energy acquisition?

Accepted Answer

Heterotrophy

Question 3

Which of the following organisms is most likely to have the highest C:N ratio in its tissues?

Accepted Answer

A terrestrial plant

Question 4

Which equation best represents the profitability of a food item according to optimal foraging theory?

Accepted Answer

$$E/h$$

Question 5

A plant that opens its stomata at night to absorb CO$$_2$$ and closes them during the day to conserve water is most likely a:

Accepted Answer

CAM plant

Question 6

Which of the following is NOT a factor that affects the quantity and quality of light available for photosynthesis?

Accepted Answer

Soil pH

Question 7

Which of the following best describes the process of chemosynthesis?

Accepted Answer

Obtaining energy from inorganic compounds to produce organic compounds

Question 8

A zebra grazing on grass is an example of which trophic strategy?

Accepted Answer

Herbivory

Question 9

Which of the following statements about functional responses is correct?

Accepted Answer

Type II functional response shows a decelerating intake rate as prey density increases.

Question 10

Which of the following adaptations is most likely to be found in a heterotroph?

Accepted Answer

Specialized mouthparts for capturing prey

Question 11

Why do aquatic autotrophs generally have a lower C:N ratio than terrestrial autotrophs?

Accepted Answer

Aquatic autotrophs have more nitrogen-rich tissues due to their environment.

Question 12

Which of the following best explains why C4 plants are more common in arid environments?

Accepted Answer

C4 plants are more efficient at using water and can maximize photosynthesis at high light levels.

Question 13

A scientist is studying a population of birds that stores food in the fall to survive the winter. This behavior is most likely an adaptation to:

Accepted Answer

Seasonality of food resources

Question 14

According to optimal foraging theory, a predator should eat a new prey item if:

Accepted Answer

$$E_{new}/h_{new} \geq E_{avg}/(h_{avg} + s_{avg})$$

Question 15

Which of the following is a real-world example of an organism using chemosynthesis?

Accepted Answer

A deep-sea bacterium using hydrogen sulfide to produce organic compounds

Question 16

Which of the following best describes the role of photosynthetically active radiation (PAR) in photosynthesis?

Accepted Answer

PAR is the portion of the electromagnetic spectrum that provides enough energy for photosynthesis.

Question 17

Which of the following is a tradeoff considered in optimal foraging theory?

Accepted Answer

Maximizing energy intake while minimizing handling time

Question 18

Which of the following is NOT a common adaptation for heterotrophy?

Accepted Answer

Chlorophyll pigments for capturing light

Question 19

Which of the following best explains why the majority of plants use the C3 pathway?

Accepted Answer

C3 pathway is most efficient at low light levels and moderate climates.

Question 20

Which of the following is a correct statement about the relationship between energy acquisition and survival?

Accepted Answer

Survival, growth, and reproduction all depend on sufficient availability of energy.

3.1Energy Acquisition and Adaptations in Organisms: Ecological Perspectives

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