An inverted pyramid of number and an inverted pyramid of biomass are respectively seen in:

• (a) Grassland and tree ecosystem
• (b) Sea and Tree ecosystem
• (c) Tree and Sea ecosystem
• (d) Sea and Grassland ecosystem
• (e) Tree and Grassland ecosystem

The concept of inverted pyramids in ecology refers to the distribution of numbers and biomass in different ecosystems. An inverted pyramid of numbers occurs when there are fewer individuals at higher trophic levels compared to lower ones, while an inverted pyramid of biomass indicates that the total biomass decreases as you move up the food chain.

Correct Answer

The correct option is (b) Sea and Tree ecosystem.

Explanation

In marine ecosystems, such as the sea, there can be a large number of small organisms (like phytoplankton) that support fewer larger predators, leading to an inverted pyramid of numbers. In contrast, in a tree ecosystem, the biomass of trees is significantly greater than that of the herbivores and carnivores that depend on them, resulting in an inverted pyramid of biomass.

Key Points

• Inverted pyramid of numbers: Common in aquatic ecosystems.
• Inverted pyramid of biomass: Often seen in forest ecosystems.