Tag: commercial applications

Questions Related to commercial applications

Given below are the characteristic features of an ecosystem
(a) Little diversity
(b) Little cycling of nutrients
(c) High productivity
These features are correct for

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. Forest ecosystem

  2. Cropfield ecosystem

  3. Grassland ecosystem

  4. More than one option is correct

Show answer
Correct Option: A

 Why are crop fields known as artificial ecosystems?

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. Crop fields are man made.

  2. Some biotic and abiotic components are manipulated by humans for the production of crop.

  3. Both A and B.

  4. None of the above.

Show answer
Correct Option: C
Explanation:
Crop fields are man made and some biotic and abiotic components are manipulated by humans. Artificial ecosystems are those ecosystems which are modified and managed by human beings.
Crop fields are man-made, plants do not grow naturally rather most of the plants are grown by humans according to the season, type of soil, etc. Crop fields are not like wild forest area which is left to the care of nature and can sustain itself.
In crop fields, the land is managed, soil is prepared for sowing seeds, then irrigated and further progress is also kept under observation for getting good yield.
Thus, crop fields are known as artificial ecosystems.
Therefore, the correct answer is option C.

Ecosystems have

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. energy inputs and outputs

  2. nutrient cycling but not outputs

  3. one trophic level

  4. both (a) and (b)

Show answer
Correct Option: A
Explanation:

An ecosystem consists of both biotic and abiotic components and interactions between them. When the interactions take place there must be some input of energy for example light energy is transferred to plants for performing photosynthesis and if there is an input of energy then there must be a continuous output of energy also.

so the correct answer is 'energy inputs and outputs'.

When we study the full assortment of organisms in an area as well as the abiotic environment that affects them, we are studying the

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. populations

  2. niche

  3. ecosystem

  4. community

Show answer
Correct Option: C
Explanation:

an ecosystem includes both biotic and abiotic components of an area. Biotic components interact with their surroundings or the abiotic component to form a sustainable environment.

so the correct answer is 'ecosystem'.

Choose the correct answers from the alternatives given :
Ecosystems are characterized by

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. one way flow of energy through the biotic community of an ecosystem

  2. interactions of organisms among themselves and the physical and chemical environment

  3. cycling of materials from the abiotic environmnent through the biotic community and back to the abiotic environment

  4. all of the above

Show answer
Correct Option: D
Explanation:

The ecosystem is a self-regulatory and self-sustaining structural and functional unit of the biosphere containing a community of living beings and the physical environment, both interacting and exchanging materials between them. In an ecosystem, energy flow is unidirectional. So, the correct option is "all of the above".

Cropland ecosystem is a natural ecosystem

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

  • Cropland includes areas used for the production of adapted crops for harvest. Two subcategories of cropland are recognized: cultivated and non-cultivated. 
  • Cultivated cropland comprises land in row crops or close-grown crops and also other cultivated cropland, for example, hay land or pasture land that is in a rotation with row or close-grown crops.
  •  Non-cultivated cropland includes permanent hay land and horticultural cropland. 
  • Major natural resource concerns facing cropland include: (1) erosion by wind and water, (2) maintaining and enhancing soil quality, (3) water quality from nutrient and pesticides runoff and leaching, and (4) managing the quantity of water available for irrigation.
So the given statement is false.

An ecosystem is not a self-sufficient unit

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. The Sun is the source of energy in most ecosystems. Energy is transferred from the Sun to plants that make their own food. The stored energy in plants is transferred to animals that eat the plants. When organisms die, their bodies decompose, or break down. The materials needed by organisms in an ecosystem are recycled, or used over again.  

So the given statement is false.

Anthropogenic ecosystems

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. show high degree of nutrient cycling

  2. show low productivity

  3. show great biodiversity

  4. Do not posses self regulatory mechanism

Show answer
Correct Option: A
Explanation:

Anthropogenic biomes, also known as anthromes or human biomes, describe the terrestrial biosphere in its contemporary, human-altered from using global ecosystem units defined by global patterns of sustained direct human interaction with ecosystems.

So, the correct option is 'Show a high degree of nutrient cycling'

Upper part of sea/aquatic ecosystem contains

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. Plankton

  2. Nekton

  3. Plankton and nekton

  4. Benthos

Show answer
Correct Option: C
Explanation:
A.Plankton - a group of uncellular organisms
B.Nekton - aquatic animals that are able to swim and move independently of water currents.
C.Plankton and nekton - a group of uncellular organisms and quatic animals that are able to swim and move independently of water currents.
D.Benthos - organisms present at the bottom of the water bodies.
So, the correct option is 'Plankton and nekton'.

Which is not true regarding ecosystem?

commercial applications issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

  1. Self sufficient unit

  2. Cyclic exchange of materials between living beings and environment

  3. Only requirement is input of energy

  4. Characterized by a major vegetation type

Show answer
Correct Option: C