What Are Ecological Pyramids

Q.

Ten percent law of energy transfer in a food chain is given by

1. Schimper

2. Elton

3. Haeckel

4. Lindemann

Q.

Two main structural features of an ecosystem are:

1. Species composition and stratification
2. Productivity and energy flow
3. Nutrient cycling and stratification
4. Species composition and productivity

Q.

In parasitic food chain, the pyramid of numbers is

1. Linear

2. Upright

3. Inverted

4. Both B and C

Q.

Why is black a good absorber?

Q.

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

Q.

What are the two characteristics of energy flow in an ecosystem?

Q.

In a food chain, the total amount of living material is depicted by

1. Pyramid of numbers

2. Trophic levels

3. Pyramid of biomass

4. Pyramid of energy

Q. (a) What is an ecological pyramid? Compare the pyramids of energy, biomass and numbers.

(b) Write any two limitations of ecological pyramids. [5]

Q. The base of ecological pyramids represents while apex represents .

1. producers
2. primary consumers
3. tertiary consumers
4. secondary consumers

Q.

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

Q.

The statement ‘Tiger is the apex of the food chain’ indicates:

1. Tiger has maximum biomass

2. Tiger is dependent upon a large number of herbivores and even large number of trees

3. Tiger has many enemies

4. Tiger is a carnivore

Q. Why is the pyramid of energy always upright? Explain.

Q.

Why do ecologists measure biomass?

Q.

In an ecological pyramid, the base represents ____________ level.

Q. Pyramid of energy is always upright indicating that

1. Producers have the lowest energy conversion efficiency.
2. Energy conversion efficiency is same for all trophic levels.
3. Carnivorous have a better energy efficiency than herbivores.
4. Herbivores have a better energy conversion efficiency than carnivores.

Q. Why the pyramid of energy is always upright? Explain.

Q. The pyramid of energy is always upright

1. True
2. False

Q. Which among the following equations relating to productivity of an ecosystem is/are correct and can be used to calculate a required entity of productivity?
I. GPP-R = NPP
II. GPP= NPP+R
III. GPP-NPP = R
IV. GPP = NPP/R

1. Only I
2. Only III
3. I and II
4. I, II and III

Q. If you were to count the number of insects feeding on a big tree what kind of pyramid would you get? Now add an estimate of the number of small birds depending on the insects, as also the number of larger birds eating the smaller.

Q. Pyramid of energy is always upright, it represents

1. There is increase in energy of ecosystem.
2. There is decrease in energy due to loss in form of heat in each trophic level.
3. There is decrease in energy due to concentration in successive levels.
4. There is increase in energy due to gain of heat in each trophic level.

Q. Which of the following is a type of ecological pyramid

1. Pyramid of number
2. Pyramid of biomass
3. Pyramid of energy
4. All of the above

Q. Ecological pyramids are of ______ types.

1. Two
2. Three
3. Four
4. Five

Q.

How is biomass calculated?

Q. Read the following statements regarding ecological pyramids and choose the correct answer.
(a) Relationship between organisms at different trophic levels is expressed in terms of number, biomass and energy.
(b) Any calculations of energy content, biomass or number has to include one group of organisms at that trophic level.
(c) In most ecosystems, all the pyramids of number, biomass and energy are upright.
(d) The pyramid of biomass in sea is generally inverted.
(e) Pyramid of energy is always inverted and can never be upright.

1. a, c and d are wrong
2. a is wrong
3. b and e are wrong
4. a and e are wrong
5. d and e are wrong

Q. Define ecological pyramid

Q.

Explain Ecological pyramid.

Q. Regarding assertion and reason, select the right option
Assertion: Ecological pyramids are also called Eltonian pyramids.
Reason: An ecological pyramid is always upright.

1. Both A and R are correct and R does not explain A

2. Both A and R are incorrect
3. A is correct, R is incorrect
4. Both A and R are correct and R explains A

Q. What do you understand by energy flow in an ecosystem? Explain energy flow through different trophic levels. Draw line diagram of a food chain.

Q. The given pyramid shows the relative biomass of zooplanktons and phytoplanktons in a marine ecosystem.
The biomass of the zooplanktons is higher than that of the phytoplanktons because

1. the zooplanktons convert energy more efficiently
2. the zooplanktons have a shorter life cycle than the phytoplanktons
3. the phytoplanktons are individually much smaller than the zooplanktons
4. the phytoplanktons have an extremely high turnover rate.

Q. Pyramid of numbers in a grassland/true ecosystem is

1. Always upright
2. Both A and B
3. Always inverted
4. Spindle shaped