Ncert Exercises & Solutions

Pyramid of numbers is

1. Always upright
2. Always inverted
3. Either upright or inverted
4. Neither upright nor inverted

The pyramid of numbers in ecosystems can be inverted or upright. In terrestrial ecosystem pyramids of number is upright. In the case of a successive decrease in members of the trophic level like a big tree, it is inverted whereas the pyramid of energy is always upright.

Whereas the pyramid of biomass may also be upright or inverted. In none of the cases always inverted pyramid or neither any pyramid may be of obtained thus other options Wrong.

Page 249, XII NCERT

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