What Is Pyramid of Number

Q.

Is there any limitation in no of tropic levels in detritus food chain?

Q. "It is often said that the pyramid of energy is always upright. On the other hand, the pyramid of biomass can be both upright and inverted". Explain with the help of examples and sketches. [5]

Q. The pyramid of numbers for a terrestrial ecosystem is upright because the energy for supporting the organisms

1. remains same.
2. increases.
3. decreases.
4. decreases and then increases.

Q.

A graphic representation of number of individuals of different species belonging to a particular trophic level in an ecosystem is known as:

1. pyramid of number

2. pyramid of energy

3. ecological pyramid

4. pyramid of biomass

Q.

What does the pyramid of numbers depict?

Q. Energy pyramids of an ecosystem tend to diminish at higher trophic levels. This is because at each successive level

1. the organisms become smaller
2. energy is stored and therefore less is passed on to the next level
3. energy is being concentrated in larger organisms
4. energy is being lost form one level to the next

Q.

The pyramid of number in the grassland ecosystem is

1. Irregular

2. Always Erect

3. Always Inverted

4. Either Erect Or Inverted

Q.

When the number of organisms at successive levels is plotted, they assume the shape of a pyramid. This is called the pyramid of

1. Biomass

2. Number

3. Energy

4. None of the these

Q. An ecological pyramid of numbers shows the:

1. Number of food chains in a food web
2. Number of organisms at each stage in the food chain
3. Number of organisms in different food chains
4. Total number of organisms in a food web

Q. The pyramid of number shows decrease in both numbers and .

1. energy
2. nutrients
3. productivity

Q. .......... is the diagrammatic representations of the trophic structure and function at successive trophic levels of an ecosystem.

Q. The pyramid of number in a grassland ecosystem is

1. always erect
2. always inverted
3. either erect or inverted
4. irregular

Q. The upright pyramid of number is absent in

1. Lake
2. Grassland
3. Pond
4. Forest

Q.

The first trophic level organisms of detritus food chain are saprophytes whereas the starters of grazing food chain are producers.

Is that second point actually right? How can the organic matter and saprophytes be the same?Arent saprophytes the consumers of detritus?
Correct me if im wrong.

Q. Define ecological pyramids and describe with examples, pyramids of number and biomass.

Q.

The sequence of species through which the organic molecules in a community process is

1. Ecosystem

2. Food chain

3. Population

4. Ecological pyramid

Q. The upright pyramid of number is absent in

1. Lake
2. Grassland
3. Pond
4. Forest

Q. An ecological pyramid of numbers shows the:

1. number of organisms at each stage in the food chain
2. number of organisms in different food chains
3. number of food chains in a food web
4. total number of organisms in a food web

Q. Assertion :Herbivore productivity is approximately $10\%$ of gross productivity of producers. Reason: Herbivores eat less and waste a lot of food energy

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. The pyramid of numbers for a terrestrial ecosystem is upright because the energy for supporting the organisms

1. remains same.
2. increases.
3. decreases.
4. decreases and then increases.

Q. Given below is an imaginary pyramid of numbers of a self sutainable ecosystem. Which of the following options is true about the pyramid?

1. Level PC has "insects" and level SC has "small insectivorous birds"
2. Level PP has " Phytoplanktons" in sea and "Whale" on top-level TC
3. Level one PP has "pipal trees" and the level SC has "sheep"
4. Level PC has "rats" and level SC has "cats"

Q. The pyramid of numbers shows decrease in both numbers and ___

Q. The upright pyramid of number is absent in

1. Lake
2. Grassland
3. Pond
4. Forest

Q.

1. Grazing food chain
2. Predator food chain
3. Decomposer food chain
4. Both A and B
   
5. Detritus food chain

Q. Major autotrophic biomass in oceans is contributed by

1. Forests
2. Algae and Phytoplanktons
3. Crops
4. None of the above

Q. The diagram below shows a food pyramid.
Which level of the food pyramid contains consumers with the least biomass ?

1. snakes
2. frogs
3. crickets
4. green plants

Q. The pyramid of number in a grassland ecosystem is

1. always erect
2. always inverted
3. either erect or inverted
4. irregular

Q. Statement 1: In a food chain number of organisms at each successive level decreases.
Statement 2: Number of organisms at any trophic level depends upon the availability of food and energy.

1. Both the assertion and the reason are true and the reason is the correct explanation for the assertion
2. Both the assertion and the reason are true but the reason is not the correct explanation of the assertion
3. Both the assertion and the reason are false
4. The assertion is true but the reason is false

Q. Which of the following does the pyramid of numbers indicate?

1. Species belonging to a particular region
2. Number of animals in a biotic community
3. Number of individuals at every trophic level
4. None of the above

Q. Pyramid of numbers in grassland ecosystem is

1. Inverted
2. Spindle-shaped
3. Upright
4. Linear