Which of the following is most often a limiting factor of the primary productivity in any ecosystem? - Biology


Which of the following is most often a limiting factor of the primary productivity in any ecosystem?


  • Carbon

  • Nitrogen

  • Phosphorus

  • Sulphur




Concept: Ecosystem
  Is there an error in this question or solution?
Chapter 14: Ecosystems and Energy Flow - Exercises [Page 320]


Balbharati Biology 12th Standard HSC for Maharashtra State Board
Chapter 14 Ecosystems and Energy Flow
Exercises | Q 1.7 | Page 320


Describe the advantages for keeping the ecosystems healthy

Define the following term and give one example:


What will be the consequence of the absence of decomposers in the ecosystem

Write one or two word for the following statement/definition :

Selfcontained unit of living things and their non-living environment needing only sunlight for its functioning

Define an ecosystem.

List the biotic and abiotic components of an ecosystem.

Which of the following is an artificial ecosystem?
(a) pond
(b) crop field
(c) lake
(d) forest

Where does all the energy in living organisms originate from?

How is energy introduced into the ecosystem?

In an ecosystem, 10% of energy available for transfer from one trophic level to the next is in the form of ______.

Put a tick mark (✓) against the correct alternative in the following statement:

The term “ecosystem” is derived from the Greek word “Oikos” meaning.

Match the items in Column I with as many items as possible in Column II.

  column I Column II
1 Grass (i) Carnivore
2 Deer (ii) Decomposers
3 cobra (iii) Primary Consumer
4 Vulture (iv) Autotroph
5 Microbes (v) Scavenger

State whether true or false– Flow of nutrients in an ecosystem is unidirectional.

What do we learn from the story of Jadav Molai Peyang?

What is shown in the picture? Write name and trophic level of each component.

What are the meanings of following symbols? Write your role accordingly?

If frog population in paddy fields declines all of a sudden,
a) What will be the effect on paddy crop?
b) Number of which consumers will decline and which will increase?
c) Name the Indian states where paddy is cultivated on a large scale.

In a food chain autotrophic plants are present at the _______ level.

Give my information

Describe the following pictures

Define the following term and give two examples.


Answer the following question.
Write the different components of a lac-operon in E. coli. Explain its expression while in an ’open’ state.

Define the term 'ecosystem'.

Name two major types of ecosystems.

Give two features of forest ecosystem.

List the characteristic flora of the coniferous forests?

Differentiate between terrestrial and aquatic ecosystem.

Ecosystem may be defined as

A pond/ lake is

Annual rainfall in the area of deciduous forest is

Which one is not a factor of the abiotic environment?

How do gymnosperms and angiosperms differ?

What is primary productivity?

This is the smallest unit of biosphere.

___________ are also called Heterotrophs.

What is an ecosystem?

Producers are also called autotrophs.

Explain the various components of ecosystem.

Write a paragraph on the functions of an ecosystem.

Environment is a broad concept.

What is indicated by this symbol?

Give scientific reason.

The various food chains in the ecosystem maintain the environmental balance.

Give scientific reason.

Without the existence of nature, human existence is almost impossible.

Complete food chain.

Grass → _________ → Frog → ________ → Eagle

Complete the concept map.

  1. Write the given food chain in the appropriate sequence.
    Grasshopper - Snake - Rice field - Eagle - Frog
  2. In which ecosystem given the food chain is included? Explain the ecosystem.
  3. If the frog population declines all of a sudden what will be the effect on paddy fields?

Identify the fresh water ecosystem.

Define ecosystem.

Identify the similar characteristics of: Lantana, African catfish and Eichhomia.

In a very short period of time, a threat to the ecosystem is caused due to the loss of ______ species.

In which one of the following organisms does the body fluid enter through nephrostome?

Arrange the following in the proper order of hydrarch succession and choose the correct option.

  1. Scrub stage
  2. Marsh - meadow stage
  3. Submerged free floating plant stage
  4. Phytoplankton
  5. Forest
  6. Submerged plant stage
  7. Reed swamp stage

Which one of the following is NOT a natural aquatic ecosystem?

The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about ______.

Which one of the following will undergo fastest bio-degradation?

The area in which an animal, plant, or microorganisms lives is called its ______.

Abiotic components include ______.

Explain the following term


The ______ is the ultimate source of energy for the biosphere as a whole.

______ is the best example of natural terrestrial ecosystem.

Ecosystem originated without human intervention is called ______.

The ecosystem in water is called ______ ecosystem.

Fish and other water creatures and plants are maintained in the terrarium.

If we protect the ecosystem, we can reduce waste by using durable goods.


Edaphic factor: Water in soil:: Physical factor: ______.

A Zoo is a natural ecosystem.

Give two examples of artificial terrestrial ecosystems?

We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?

Cooperation of the two photosystems of the chloroplast is required for:

Complete the following chart related to the components of the Ecosystem.

Give an example of a food chain.

Define the term:

Net Primary Productivity

Which are the major producers in an aquatic ecosystem?

When was the concept of ecosystem services given? By whom was it given?

Give the stratification seen in open seas.

Which is the most important service provided by environment?

Explain BOD and its effects on aquatic ecosystem.

Describe the functions of the ecosystem.

The pioneer organism in hydrarch are.


      Forgot password?
Use app×