Question

What type of ecological pyramid would be obtained with the following data ?
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g

• A. Inverted pyramid of biomass
• B. Upright pyramid of numbers
• C. Pyramid of energy
• D. Upright pyramid of biomass

Answer 1

The Correct Option is A

The question requires us to determine the type of ecological pyramid formed given the data on the masses of secondary consumers, primary consumers, and primary producers.

Let's analyze the data provided:

1. Secondary consumer mass: 120 g
2. Primary consumer mass: 60 g
3. Primary producer mass: 10 g

Ecological pyramids can depict the number of organisms, biomass, or energy at each trophic level in an ecosystem. In this case, the data provided corresponds to biomass (the total mass of organisms).

To determine the type of pyramid:

• In a typical upright pyramid of biomass, the biomass decreases at each higher trophic level. Therefore, producers have the highest biomass, followed by primary consumers, and then secondary consumers.
• In the data given, the primary producer has the lowest biomass (10 g), and the biomass actually increases at higher trophic levels (60 g for primary consumers and 120 g for secondary consumers).

Since the biomass increases as we move up the trophic levels, this forms an inverted pyramid of biomass.

Let's review why the other options wouldn't be correct:

• Upright pyramid of numbers: There is no data on the number of organisms, and even if it were considered, the given pattern is not in terms of numbers.
• Pyramid of energy: Energy pyramids are always upright since energy is lost at each trophic level.
• Upright pyramid of biomass: Would require decreasing biomass at higher trophic levels, which the provided data contradicts.

Thus, the correct answer is: Inverted pyramid of biomass.