Which of the following statements are correct? (A) Certain mass of living material at each trophic level is called as standing crop. (B) The crop that can withstand adverse conditions is called standing crop (C) The amount of nutrients in soil is called Biomass (D) Only Biotic components make an Ecosystem (E) Most of Phytoplanktons are member of algae Choose the correct answer from the options given below:
(A) and (E) only
Understanding Ecological Concepts: Standing Crop, Biomass, and Ecosystems
Let's analyze each statement to determine which ones are correct regarding ecological concepts.
- Certain mass of living material at each trophic level is called as standing crop.
This statement defines 'standing crop' correctly. Standing crop refers to the total mass (biomass) of living organisms present at a particular trophic level at a specific time in an ecosystem. It is typically expressed as biomass per unit area or volume.
Evaluation: Correct.
- The crop that can withstand adverse conditions is called standing crop.
This statement is incorrect in the context of ecology. While certain agricultural crops might be bred for resilience, 'standing crop' in ecology specifically refers to the biomass at a trophic level, not a crop's ability to withstand harsh conditions.
Evaluation: Incorrect.
- The amount of nutrients in soil is called Biomass.
This statement is incorrect. Biomass is the total mass of living organisms in a given area or volume. The amount of nutrients in the soil refers to the inorganic substances available to plants and other organisms; it is part of the abiotic (non-living) component of an ecosystem, not biomass.
Evaluation: Incorrect.
- Only Biotic components make an Ecosystem.
This statement is incorrect. An ecosystem is composed of both biotic (living organisms) and abiotic (non-living components like soil, water, air, sunlight, nutrients) components interacting with each other.
Evaluation: Incorrect.
- Most of Phytoplanktons are member of algae.
This statement is generally correct. Phytoplankton are microscopic organisms that live in aquatic environments and perform photosynthesis. The majority of phytoplankton are single-celled algae, although some types of bacteria (like cyanobacteria) are also considered phytoplankton.
Evaluation: Correct.
Based on the analysis, statements (A) and (E) are correct.
Identifying the Correct Statements
We have determined that Statement (A) defining standing crop in terms of biomass at a trophic level is correct, and Statement (E) stating that most phytoplankton are algae is also correct.
Statements (B), (C), and (D) are incorrect based on standard ecological definitions.
Conclusion
The correct statements are (A) and (E).
| Statement | Content | Correctness |
|---|---|---|
| (A) | Standing crop is living material mass at each trophic level. | Correct |
| (B) | Standing crop is a crop withstanding adverse conditions. | Incorrect |
| (C) | Amount of nutrients in soil is Biomass. | Incorrect |
| (D) | Only Biotic components make an Ecosystem. | Incorrect |
| (E) | Most Phytoplanktons are algae. | Correct |
Revision Table: Ecological Terms
| Term | Definition |
|---|---|
| Standing Crop | The total mass of living organisms (biomass) at a particular trophic level at a specific point in time. |
| Biomass | The total mass of organisms in a given area or volume, often expressed in terms of energy or weight. |
| Trophic Level | The position that an organism occupies in a food chain or food web. Examples include producers, primary consumers, secondary consumers, etc. |
| Ecosystem | A community of living organisms (biotic components) interacting with each other and their physical environment (abiotic components). |
| Phytoplankton | Microscopic photosynthetic organisms that float in aquatic environments, forming the base of many aquatic food webs. Primarily includes single-celled algae and some bacteria. |
| Biotic Components | The living parts of an ecosystem (plants, animals, fungi, microorganisms). |
| Abiotic Components | The non-living physical and chemical parts of an ecosystem (sunlight, water, soil, air, nutrients, temperature). |
Additional Information on Ecosystem Components and Energy Flow
Understanding concepts like standing crop, biomass, and trophic levels is crucial for studying how energy and matter flow through ecosystems.
- Ecosystems are dynamic systems where energy flows, usually originating from sunlight captured by producers (like plants and algae). This energy is then transferred through different trophic levels as organisms consume each other.
- Biomass represents stored energy within the organic matter of organisms. When one organism eats another, a portion of this biomass (and energy) is transferred.
- The standing crop at any trophic level gives us a snapshot of the total living matter available at that level at a specific moment. It is different from productivity, which is the rate at which biomass is produced.
- Phytoplankton, being primary producers in many aquatic ecosystems, form the base of the food chain, supporting zooplankton, fish, and ultimately, larger marine animals. Their abundance significantly impacts the health and productivity of aquatic environments.
Important Questions from Ecosystem
Match List - I with List -II.
List - I List - II (A) Detritus food chain (I) Available biomass for consumption (B) Standing state (II) Dead organic matter (C) Standing crop (III) Amount of nutrients in soil (D) Net Primary Productivity (IV) Mass of living material Choose the correct answer from the options given below:
Vertical distribution of different species occupying different level is called:
Which of the following option determines percolation and water holding capacity of soils?
About ________ energy is used to build new biomass in ecological pyramid.
Which cycle shows the movement of water?
