Tag: organisms and environment

Questions Related to organisms and environment

I. Temperature
II. Humidity
III. Vegetation 
The abiotic factors of ecosystem include

  1. I only

  2. II only

  3. III only

  4. I and II only

  5. I, II and III


Correct Option: D
Explanation:

Biotic factors of an ecosystem include all plant and animal species present in there. The abiotic factors include a physical environment in which they can survive. It includes light, temperature, humidity and other climatic condition as well as physical factors like soil. Thus, the correct answer is D. 

Pedology is the science of

  1. Rocks

  2. Diseases

  3. Soil

  4. Pollution


Correct Option: C
Explanation:

Pedology is the study of soils in their natural environment. It is one of the two branches of soil.

The part of the biosphere which contains soil is known as 

  1. Pedosphere

  2. Lithosphere

  3. Hygrosphere

  4. Toposphere


Correct Option: A
Explanation:
  • Pedosphere is an outer layer of earth that contains soil.
  • Lithosphere includes the brittle upper portion of the mantle, crust and Mantles are made of rock or ices. 
  • Hydrosphere contains all the waters on the earth's surface, such as lakes and seas.
  • Troposphere is the lowest layer of the atmosphere, closest to the earth's surface. so option A is a correct answer.

In a .......... ecosystem, the producers are mostly herbaceous or woody plants.

  1. Terrestrial

  2. Aquatic

  3. Desert

  4. None of these


Correct Option: A
Explanation:

Herbaceous plants are plants with very flexible stems. Woody plants include trees and shrubs. These are the plants present in the terrestrial ecosystem. They convert solar energy into chemical energy through photosynthesis in which carbon dioxide and water are used in presence of sunlight to synthesize nutrients such carbohydrates in the form of glucose and release oxygen into the atmosphere. Since plants form the base of the terrestrial ecosystem they are the producers.

Environment consists of

  1. land, air, water

  2. light, temperature and rainfall

  3. plants, animals and microbes

  4. All the above


Correct Option: D
Explanation:
The environment consists of two major components:
  • Abiotic components: These are non-living components of the environment and consist of two things, materials and energy (that may be light or chemical energy). Materials include land, air, water, minerals, salts, atmospheric gases, rainfall, temperature etc.
  • Biotic components: These are living components of the environment and divided into autotrophic and heterotrophic components. An autotrophic component is the producers or green plants while heterotrophic component includes consumers (primary, secondary and tertiary consumers) and decomposers (microbes).
Hence, all the given options are correct.
So, the correct answer is 'All the above'.

Which of the following components of biosphere makes an interface with the soil?

  1. Pedosphere

  2. Troposhere

  3. Atmosphere

  4. Stratosphere


Correct Option: B

Which of the following gas is present at a very high concentration in our environment?

  1. $O _{2}$

  2. $CO _{2}$

  3. $H _{2}$

  4. $N _{2}$


Correct Option: D

At any given time,  __________ of the earth is illuminated by the sun.

  1. One-fourth

  2. One-third

  3. One-half

  4. Two-thirds


Correct Option: C

Which ecosystem is important in purifying air, recycling water and controling climate?

  1. Man subsidized solar power ecosystem

  2. Fuel power ecosystem

  3. Naturally subsidized solar powered ecosystem

  4. Unsubsidized natural solar powered ecosystem


Correct Option: A

Edaphic factors are related to 

  1. Humidity

  2. Soil texture

  3. Rainfall

  4. Wind velocity


Correct Option: B
Explanation:
  • Various environmental factors can be divided majorly into climatic factors, edaphic factors and biotic factors.
  • The factors which relate to structure and composition of soil are called edaphic factors. Soil composition, organic matter, soil water, soil air and soil organisms are examples of edaphic factors.
  • Humidity, rainfall and wind velocity are climatic factors.
  • Examples of biotic components include animals, plants, fungi, and bacteria.
  • So the correct option is B.