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Which of the following is expected to have the highest value (gm/m²/yr) in a grassland ecosystem?

1. Secondary Production
2. Tertiary Production
3. Gross Production (GP)
4. Net Production (NP)

Correct answer: Gross Production (GP)

Solution

Gross production is the total amount of organic matter/energy captured by producers in photosynthesis, so it is the largest production value in a grassland. Net production is lower because it subtracts respiration, and secondary/tertiary production are even smaller because energy is lost at each trophic transfer.

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