Exam 5: Coping With Environmental Variation: Energy

Suppose a crow normally uses 50 energy units to extract larvae from holes in trees and only 5 energy units foraging for nuts. The crow can get 60 energy units from eating larvae and 15 energy units from eating nuts. The crow can decrease the amount of energy used to extract larvae from holes to 5 energy units, but only if it first spends 15 energy units building a tool. In which case does the crow obtain the most net energy?

Which of these organisms are not heterotrophs?

Suppose that a small plant, through photosynthesis, has generated 12 trillion molecules of glucose. Based on the net reaction of photosynthesis, the cell has split how many molecules of water?

The ratio of carbon-13 to carbon-12 in a sample of material from a CAM plant is 124:10,000. The same ratio for the reference standard is 125:10,000. Delta (δ) is thus _______ per thousand.

Refer to the figure. You are conducting an experiment on food preferences in New Caledonian crows. Based on previous isotopic analyses, use the figure to predict foods from most preferred to least preferred based on the available choices.

Refer to the figure. Based on the figure, which group or groups of pigments absorb visible light primarily in the red and orange part of the spectrum?

Which is the correct order of energy per unit mass, from highest to lowest?

A bacterium that obtains energy by converting inorganic compounds in its environment is a(n)

Benkman's experiment with five species of birds of the crossbill species complex showed that each species' bill morphology had a positive correlation with its preferred pine cone, which also provided the highest survival rate of each bird type. What major conclusion did Benkman make in response to this evidence?

The biochemical pathway most commonly used by plants and chemosynthetic bacteria to fix CO₂ in order to synthesize carbohydrates is

The use of specialized bacteria to help break down a toxic organic pesticide spilled during an industrial accident is an example of