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productivity in ecosystems Flashcards

(17 cards)

1
Q

What is counted towards biomass of a plant?

A

The biological molecules that aren’t respired by the plants.

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2
Q

What is gross primary production?

A

The chemical energy store in biomass in a given area or volume in a given time.

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3
Q

What is net primary production?

A

The chemical in plant biomass after respiratory losses to the environment have been taken into account.

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4
Q

What is the equation involving both gross primary production and net primary production?

A

NPP = GPP - R

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5
Q

What are usually the units for primary production?

A

kJm -2 yr -1

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6
Q

Why is it not always advised to continually increase the temperature of glasshouses?

A

The rate of respiration may exceed the rate of photosynthesis decreasing the yield.

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7
Q

What is the equation for the net production of consumers?

A

N = I – (F + R)

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8
Q

What does N represent?

A

The net production of consumers.

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9
Q

What are usually the units for the net production of consumers?

A

kJm -2 yr -1

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10
Q

What does I represent?

A

The chemical energy store in ingested food.

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11
Q

What does F represent?

A

The chemical energy lost to the environment.

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12
Q

What does R represent?

A

The respiratory losses to the environment as heat.

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13
Q

What are saprobiotic decomposers?

A

Carries out extracellular digestion secreting out enzymes onto decaying matter and all the products have been taken up by active transport.

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14
Q

What is a food chain?

A

A straightforward feeding relationship from producers through to consumers.

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15
Q

What is the first trophic level?

A

Producers.

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16
Q

Why are apex predators so rare?

A

Energy is lost at each trophic level.

17
Q

Why are food webs more accurate?

A

Food chains are not independent in an ecosystem.