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प्रश्न
Distinguish between upright and inverted pyramids.
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उत्तर
| Sr. No. | Upright pyramid | Inverted pyramid |
| 1. | In an upright pyramid (e.g., a grassland and cropland ecosystem), biomass, the number of organisms, or the amount of energy decreases as one moves to successive higher trophic levels. | In an inverted pyramid, either the number of organisms increases (e.g., a tree ecosystem) or the biomass increases (e.g., a marine ecosystem) at successive trophic levels. |
| 2. | In an upright pyramid, the producers are more in number than the herbivores. | In the inverted pyramid, the number of producers is less, and the number of consumers is more than the number of producers. |
| 3. | The pyramid of energy is always upright. | The pyramid of numbers and the pyramid of biomass can be inverted. |
| 4. | The base bar, which includes producers, is the largest, while the bar at the vertex of the pyramid, which includes top consumers, is the smallest. | The base bar for producers is the smallest, while the vertex bar for top consumers is the largest (widest). |
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संबंधित प्रश्न
Why the pyramid of energy is always upright? Explain.
In an ecosystem dominated by trees, the pyramid (of numbers) is ______ type.
Distinguish between a food chain and a food web.
Describe with examples of pyramids of number and biomass.
In a food chain, the herbivores are represented by
(A) producers
(B) primary consumers
(C) secondary consumers
(D) decomposers
“The pyramid of biomass is not always upright.” Explain the statement.
Write any two limitations of ecological pyramids.
'The pyramid of energy is always upright.' Explain
Explain with the help of labelled diagrams, the difference between an upright pyramid of biomass and an inverted pyramid of biomass.
Secondary consumers are __________.
Pyramid of energy in grassland and pond ecosystem is always ______.
Which one of the following is not used for construction of ecological pyramids?
In a pyramid of biomass, if the total dry weight (kgm-2) of primary produces is about 809, it well increases at tertiary consumer level up to ______.
Pyramid of biomass in terrestrial ecosystem shows sharp decline in
In an aquatic ecosystem, a mollusc typically belongs to-
The number of trophic levels in an ecosystem are limited. Comment.
Write a short note on pyramid of numbers and pyramid of biomass.
(a) Given below is a pyramid of biomass in an ecosystem where each bar represents the standing crop available in the trophic level. With the help of an example explain the conditions where this kind of pyramid is possible in nature.
(b) Will the pyramid of energy be also of the same shape in this situation? Give a reason for your response.
(a) Draw a pyramid of numbers where a large number of insects are feeding on the leaves of a tree. What is the shape of this pyramid?
(b) Will the pyramid of energy be also of the same shape in this situation? Give a reason for your response.
Draw a diagram of pyramid of energy.
A graphic representation of the biomass relationship between the producer and consumer in an ecosystem is called ______.
Give a scientific reason:
The pyramid of energy is always upright.
Describe pyramid of energy with the help of diagram.
| In a forest ecosystem, a large population of insect feeds upon a banyan tree. Several small birds feed upon these insects. The small birds are fed upon by big-sized birds. |
- With respect to this ecosystem, draw a pyramid for each biomass and a pyramid of number.
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If 20,000 Kcal energy is available at the level of insects, calculate the amount of energy available at the level of big-sized birds.
