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The upright pyramid of number is absent in
A
Grassland
B
Pond
C
Forest
D
Lake
Detailed Solution
In grassland, pond and lake ecosystems the producers are the most numerous, so the pyramid of numbers is upright.
In a forest (tree) ecosystem a few large trees support many insects and birds, so the pyramid of numbers is not upright.
In a forest (tree) ecosystem a few large trees support many insects and birds, so the pyramid of numbers is not upright.