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'All the pyramids, of number, of energy ...

'All the pyramids, of number, of energy and biomass are upright''.
(i) Grass land (ii) A big tree
(iii) A sugarcane field (iv) The Arabian Sea
Find the option which correctly tells the ecosystem (s) for which the above statement doesn't hold true.

A

(ii), (iii) and (iv)

B

(i) & (ii)

C

(ii) and (iv)

D

(iii) & (iv)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the ecological pyramids of number, energy, and biomass, we will analyze each of the given ecosystems to determine which ones do not have upright pyramids. ### Step-by-Step Solution: 1. **Understanding Ecological Pyramids**: - Ecological pyramids represent the distribution of energy, biomass, or number of organisms at each trophic level in an ecosystem. - There are three types: pyramid of number, pyramid of biomass, and pyramid of energy. 2. **Analyzing Each Ecosystem**: - **(i) Grassland**: - In a grassland ecosystem, the pyramid of number is upright because there are many plants (producers), fewer herbivores (like deer), and even fewer carnivores (like tigers). - The pyramid of biomass is also upright as the biomass of plants is greater than that of herbivores, which in turn is greater than that of carnivores. - The pyramid of energy is always upright as energy decreases at each trophic level. - **(ii) A Big Tree**: - In a parasitic ecosystem involving a big tree, the pyramid of number can be upright (one tree, many birds, many parasites). - The pyramid of biomass is also upright since the tree has more biomass than the birds, and the birds have more biomass than the parasites. - The pyramid of energy remains upright as well. - **(iii) A Sugarcane Field**: - A sugarcane field is similar to a grassland ecosystem. The pyramid of number, biomass, and energy are all upright for this ecosystem as well. - **(iv) The Arabian Sea**: - In an aquatic ecosystem like the Arabian Sea, the pyramid of number can be upright (many small fish, fewer larger fish, and very few top predators). - The pyramid of biomass, however, can be inverted because the biomass of large fish can exceed that of the numerous small fish due to their size. - The pyramid of energy remains upright. 3. **Identifying the Correct Answer**: - The question asks for the ecosystems where the statement "all the pyramids are upright" does not hold true. - From the analysis, the Arabian Sea is the only ecosystem where the pyramid of biomass can be inverted, making it the correct answer. ### Final Answer: The ecosystems for which the statement does not hold true are: - (iv) The Arabian Sea.
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