Correct Option (b)
Reason : Pyramid of number represents the number of individuals per unit area at various trophic levels. It is always upright in grassland, pond and lake ecosystems. But in forest or single tree ecosystem, it is spindle-shaped and of parasitic food chain is considered then it will be an inverted pyramid.
Correct Option (b) Reason : Pyramid of number represents the number of individuals per unit area at various trophic levels. It is always upright in grassland, pond and lake ecosystems. But in forest or single tree ecosystem, it is spindle-shaped and of parasitic food chain is considered then it will be an inverted pyramid.