AP BIOLOGY

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ECOLOGY

CHEMICAL CYCLES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Bob grows vegetables in the same soil year after year. The plants produce less and less vegetables each year. Which of these processes could help explain Bob’s observation?
A
the rate at which soil bacteria perform photosynthesis
B
the rate at which soil bacteria perform denitrification
C
the rate at which soil bacteria perform cellular respiration
D
the rate at which soil bacteria perform nitrogen fixation
Explanation: 

Detailed explanation-1: -The driving force of symbiosis between a plant and a nitrogen-fixing microorganism is the exchange of nutrients between the two partners. In return for fixed nitrogen, the plant typically provides its bacterial symbiont with a carbon source and, depending on the intimacy of the symbiosis, other crucial nutrients.

Detailed explanation-2: -Q. Juanita is studying the food web of the open ocean. Which step would be most useful for her to follow to identify the primary producers of the food web? Look for floating plants, such as water lilies.

Detailed explanation-3: -Plants absorb ammonium and nitrate during the assimilation process, after which they are converted into nitrogen-containing organic molecules, such as amino acids and DNA.

Detailed explanation-4: -Denitrification-Extra nitrogen in the soil gets put back out into the air.

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