Tag: organisms and environment

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Questions Related to organisms and environment

Multiple choice biology living in harmony climate factors abiotic components organisms and environment

Out of the total proposed cost of various ecosystem services, cost of climate regulations and habitat for wildlife are.

  1. $50\%$
  2. $10\%$
  3. $6\%$
  4. $25\%$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Robert Constanza and his colleagues have put the value of ecosystem services to $33$ trillion dollars a year. Out of which $50\%$ is proposed for formation of soil, prevention of flood and mitigating droughts. The value of $10\%$ each for nutrient cycle and recreation and $6\%$ for climate regulation and habitat preservation for wild flora and fauna has been proposed.

Multiple choice biology living in harmony climate factors abiotic components organisms and environment

Edaphic factor refers to.

  1. Water

  2. Soil

  3. Relative humidity

  4. Altitude
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Edaphic factors are classified under the abiotic factors affecting an ecosystem. Edaphic factors include factors of soil, e.g., soil texture, substratum, topography, mineral composition, pH, etc. These factors can influence the distribution and interrelationships of organisms, as well as rate of decomposition.

Multiple choice biology the habitat of living climate factors abiotic components organisms and environment

Life arose in

  1. Soil

  2. Fresh water

  3. Marine water

  4. Air
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

We know that the environment we live in is made up of 2 components, namely living (biotic) and non-living (abiotic). Different theories were proposed to study the origin of the wife. But they lead to the conclusion that life had originated on earth in seawater and marine organisms were one of the first to emerge. In earth's early atmosphere, there was no ozone layer, thus the UV rays of the sun could directly reach the earth. As living organisms cannot survive UV radiation directly, many scientists believed that life originated in aquatic habitats. Apart from this, different requirements of these early organisms were also fulfilled in the deep-sea vents. 

Thus, option C 'Marine Water' is the correct option.

Multiple choice biology living in harmony climate factors abiotic components organisms and environment

Terrestrial life would become impossible with

  1. Disappearance of moon
  2. Decrease in mean annual temperature by $10^o C$

  3. Change in orbit of earth

  4. Change in atmosphere permitting all solar radiations to reach lithosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The total amount of solar radiation reaching to the lithosphere do not enter the surface of the earth as it would heat up the earth making it unsuitable for any life. Therefore, 35% of the solar radiation are reflected back to the space.

So, the correct answer is option D.

Multiple choice biology living in harmony climate factors abiotic components organisms and environment

The abiotic factors of the environment are
I. Temperature
II. Humidity
III. Vegetation

  1. I only

  2. II only

  3. III only

  4. I and II only

  5. I, II and III
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An ecosystem is made up of abiotic components or abiotic factors which are non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems. Abiotic factors include water, light, radiation, temperature, humidity, atmosphere and soil. 

Biotic components are the living things that shape an ecosystem. Biotic components usually include Producers (vegetation), Consumers and Decomposers. Therefore only temperature and humidity are included under Abiotic factors. Hence, the correct answer is option D.

Multiple choice biology living in harmony climate factors abiotic components organisms and environment

All of these are examples of abiotic factors except 

  1. Mushrooms

  2. Soil type

  3. Average yearly rainfall

  4. Sunlight

  5. Relative humidity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The environment is a complex of many factors which surround an organism. These factors are known as environmental factors or ecological factors which may be either living or biotic and non-living or biotic. 
Biotic factors include plants, animals, microbes etc.
Abiotic factors are the non-living factors, substances, and conditions of the environment which influence the physiology, survival, function, and reproduction of organisms. These factors are divided as:
1. Direct factors- For example, light, temperature, humidity of the air, soil air, soil water, soil nutrients etc.
2. Indirect factors- For example, soil structure, soil organisms, altitude, wind, slopes etc.
Hence, Mushrooms will be included under biotic factors and soil type, average yearly rainfall, sunlight and relative humidity will be included under abiotic factors.
So, the correct answer is 'Mushrooms'.
Multiple choice biology living in harmony climate factors abiotic components organisms and environment

Which of the following is not a property of water?

  1. It becomes more dense when it freezes.

  2. It dissolves molecules in the air.

  3. It absorbs heat when the hydrogen bonds break.

  4. It forms hydrogen bonds with other water molecules to create surface tension.

  5. It form hydrogen bonds with other molecules by adhesion.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A. When water freezes, it is converted into ice. Ice has a cage like structure and thus, its density is less than water. Hence, water becomes less dense when it freezes.
B. Water is a polar solvent and thus, many gases are soluble in water. Hence, it dissolves molecules in the air.
C. Water has high energy hydrogen bonds. When these bonds break, heat is released which is absorbed by the water due to its high specific heat capacity.
D. Surface tension is interaction between water molecules which results due to formation of hydrogen bonds between water molecules.
E. Adhesion is the force of attraction between different molecules. Water can form hydrogen bonds with other molecules and this is called adhesion.
Hence, statement A is incorrect.
So, the correct answer is 'It becomes more dense when it freezes'.
Multiple choice biology living in harmony climate factors abiotic components organisms and environment

All of these are considered ecosystem services except

  1. Water purification

  2. Nutrient cycling

  3. Crop pollination

  4. Waste decomposition

  5. None of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation
The benefits obtained from ecosystem are considered as ecosystem services.
A. As the polluted and wastewater flows through wetlands and forests, it gets filtered and cleaned naturally.
B. Pollination is the transfer of pollen grain from anther to the sigma. Pollinators such as bees, butterflies, birds etc. aid in pollination.
C. Waste decomposition is the breakdown of complex organic materials into simpler ones by the action of microorganisms (detritivores).
D. Nutrient cycling is the exchange and movement of organic matter within the ecosystem.
So, the correct answer is 'All of the above'.
Multiple choice biology living in harmony climate factors abiotic components organisms and environment

Which of these is an example of an abiotic factor?
I.    Crickets
II.   Rainfall
Ill.  Shark

  1. I only

  2. II only

  3. III only

  4. I and III only

  5. I, II and III
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Abiotic factors are the non living factors, substances and conditions of the environment which influence the physiology, survival, function, behaviour and reproduction of organisms. The major abiotic factors are temperature, water, light and soil. 
Hence among all the options given in the question, rainfall is the abiotic factor while crickets and sharks are included under biotic factors as they are living factors.
So, the correct answer is 'II only'.