Tag: abiotic components

Questions Related to abiotic components

Which of the following is not a property of water?

biology living in harmony climate factors abiotic components organisms and environment

  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.

Show answer
Correct Option: A
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'.

All of these are considered ecosystem services except

biology living in harmony climate factors abiotic components organisms and environment

  1. Water purification

  2. Nutrient cycling

  3. Crop pollination

  4. Waste decomposition

  5. None of the above

Show answer
Correct Option: E
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'.

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

biology living in harmony climate factors abiotic components organisms and environment

  1. I only

  2. II only

  3. III only

  4. I and III only

  5. I, II and III

Show answer
Correct Option: B
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'.

Which is not a natural ecosystem?

biology living in harmony climate factors abiotic components organisms and environment

  1. Desert

  2. Aquarium

  3. Forest

  4. All of the above

Show answer
Correct Option: B

Which of the following is a climatic factor?

biology living in harmony climate factors abiotic components organisms and environment

  1. Oxygen

  2. Temperature

  3. Soil structure

  4. Altitude

Show answer
Correct Option: B
Explanation:

The constituents of the environment, which directly or indirectly influence the form and functioning of organisms in any specific way are known as environmental factors. They are of two types: abiotic and biotic. 

The abiotic factors are of four types-
  1. Climatic (light, air, temperature, humidity, precipitation)
  2. Edaphic (soil)
  3. Topographic (surface behaviour of earth)
  4. Fire 
Therefore, the correct answer is option B.

If all the plants of the world die, all the animals will also die due to shortage of

biology living in harmony climate factors abiotic components organisms and environment

  1. Cold air

  2. Oxygen

  3. Timber

  4. None of the above

Show answer
Correct Option: B
Explanation:
Plants maintains the balance of oxygen and carbon dioxide in the atmosphere. The plants perform photosynthesis and releases oxygen. The oxygen released by the plants is taken by the animals which is used for breakdown of food and release energy. If all the plants will die the animals will also die due to shortage of oxygen.
So, the correct answer is option B.

Source of energy in ecosystem is

biology living in harmony climate factors abiotic components organisms and environment

  1. Sun

  2. ATP

  3. Sugar made by plants

  4. Green plant

Show answer
Correct Option: A
Explanation:

The source of energy in an ecosystem is the sun. The solar energy is trapped by green plants and converted into biologically useful form i.e., carbohydrates. All the consumers depend either directly or indirectly on green plants for nutrition. The energy flow in an ecosystem is always unidirectional i.e., solar radiation to producers to herbivores to carnivores.

Which of the following is present in maximum amount in atmosphere?

biology living in harmony climate factors abiotic components organisms and environment

  1. Oxygen

  2. Nitrogen

  3. Carbon dioxide

  4. Hydrogen

Show answer
Correct Option: B
Explanation:
By volume, dry air contains about 78% nitrogen, 21% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases
So, the correct answer is 'Nitrogen'

Which of the following is a source of energy to an ecosystem?

biology living in harmony climate factors abiotic components organisms and environment

  1. Solar energy

  2. Sugar stored

  3. Heat liberated during respiration

  4. ATP

Show answer
Correct Option: A
Explanation:

In an ecosystem, green plants trap solar energy and convert it into sugars which are utilised by all the living organisms and also passed on to successive trophic levels. Thus, the correct answer is option A.

In an ecosystem of abiotic components which of the following occur?

biology living in harmony climate factors abiotic components organisms and environment

  1. Flow of energy

  2. Cycling of materials

  3. Consumers

  4. Flow of energy and cycling of materials

Show answer
Correct Option: B
Explanation:

In an ecosystem plants produces their own food by utilising solar energy, water and carbon dioxide, which is then transfer to the successive trophic levels. Some of the minerals are locked in living systems as constituents of protoplasm. These minerals are returned to environment through the decomposition of death and decay of organisms.Thus, the correct answer is option B.