Question

In the pyramid of numbers find out the correct possibilities.

• A. Level PP is phytoplankton in sea and level TC is whale
• B. Level PC is rats and level SC is cats
• C. Level PC is peepal tree and level SC is sheep
• D. Level PC is insects and level SC is small insectivorous birds

Answer 1

The correct option is D Level PC is insects and level SC is small insectivorous birds

Pyramid of numbers
Pyramid of numbers conveys the number of individuals per unit area of various trophic levels. It can be upright, spindle-shaped or inverted.
Spindle-shaped pyramid of numbers
The pyramid of numbers for a tree in a forest ecosystem can be spindle-shaped. So the given image represents a ‘spindle-shaped pyramid of numbers’. In the given pyramid of numbers, level PC is insects and level SC is small insectivorous birds. The first trophic level represents a tree (primary producer), the second trophic level represents number of insects (primary consumers), third one represents the number of small insectivorous birds (secondary consumers) whereas the fourth one represents the number of big birds such as the hawk or eagle (tertiary consumers). Here, primary producers are minimum in number and primary consumers are maximum in number.
Pictorial representation of spindle-shaped pyramid


Final answer
(D) Level PC is insects and level SC is small insectivorous birds