Tag: energy flow in food chain

Questions Related to energy flow in food chain

The plant Cuscuta shows maximum photosynthesis in

botany ecosystem energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. Red light

  2. Blue light

  3. Green light

  4. No photosynthesis at all

Show answer
Correct Option: D
Explanation:

Cuscuta is a parasite which do not possess a chlorophyll. It is not having the capability to photosynthesize. It survives by extracting nourishment from the host plant.

Amount of commercial energy being obtained from nuclear reactors in France is

botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. 35%

  2. 51%

  3. 73%

  4. 42%

Show answer
Correct Option: C
Explanation:
Nuclear power is a major source of energy in France, with a 40% share of energy consumption in 2015. Nuclear power is the largest source of electricity in the country, with a generation of 379.1 TWh, or 71.6% of the country's total production of 519.4 TWh, the highest percentage in the world.  France's present electricity generation mix is a result of the French government deciding in 1974, just after the first oil shock, to expand rapidly the country's nuclear power capacity, using Westinghouse technology.
So the correct answer is '73%'.

State whether the following statements are true or false .
The term entropy refers to steady state.

botany organisms and their environment energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Entropy is a measure of the disorder or randomness in the system. It is a measure of how organized or disorganized energy is in a system of atoms or molecules. Greater the randomness of the system, greater is its entropy. While the steady state is a condition of a system or process (such as one of the energy states of an atom) that does not change in time. 

So, the correct option is 'False'.

Choose the correct answers from the alternatives given .
Which of the following statements is not a consequence of the second law of thermodynamics?

botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. While the total amount of energy is unchanged, the energy lost as heat is no longer useful to the cell in doing work

  2. Reactions that occur spontaneously are those that increase the amount of useful energy in a system

  3. Amount of disorder in the universe is always increasing

  4. To maintain rganisation of a cell, a continual input of energy is required

Show answer
Correct Option: B
Explanation:

In spontaneous reactions release free energy and it moves to a lower, more thermodynamically stable energy state. Hence, instead of an increase in the amount of useful energy in a system spontaneous reactions release free energy. 

So, the correct option is 'Reactions that occur spontaneously are those that increase the amount of useful energy in a system'.

The principles which bind all living systems together are _______________.

botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. Laws of thermodynamics

  2. Laws of heredity

  3. Mechanisms of photosynthesis

  4. Modes of germination

Show answer
Correct Option: A

Choose the correct answers from the alternatives given .
Which of the following best describes the second law of thermodynamics?

botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. Energy is neither created nor destroyed, but it can change from one energy form to another

  2. Energy can be created from matter or used to produce mailer

  3. Some useful energy is lost as heat whenever an energy transfer occurs

  4. Energy transfers are always 100% efficient in changing energy from one useful form to another

Show answer
Correct Option: C
Explanation:

The second law of thermodynamics states that whenever energy is transformed, there is a loss of energy through the release of heat. This occurs when energy is transferred between trophic levels as illustrated in a food web. When one animal feeds off another, there is a loss of heat (energy) in the process. Additional loss of energy occurs during respiration and movement. Hence, more and more energy is lost as one moves up through trophic levels.
So, the correct option is 'Some useful energy is lost as heat whenever an energy transfer occurs'.

Choose the correct answers from the alternatives given .
According to the first law of thermodynamics

botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. systems rich in energy are intrinsically unstable

  2. all processes increase the entropy of the universe

  3. energy is conserved in all processes

  4. matter can be neither created nor destroyed

Show answer
Correct Option: C
Explanation:

The First Law of Thermodynamics states that heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy. This means that heat energy cannot be created or destroyed.

So, the correct option is 'energy is conserved in all processes'.

Choose the correct answers from the alternatives given .
Which of the following describes the first law of thermodynamics?

botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. Energy is neither created nor destroyed, but it can change into matter

  2. Energy is neither created nor destroyed, but it can change from one energy form to another

  3. Some useful energy is lost as heat whenever an energy transfer occurs

  4. Energy transfers are always 100% efficient in changing energy from one useful form to another

Show answer
Correct Option: B
Explanation:

The first law of thermodynamics says that energy can't be created or destroyed, but it can be changed. The law forms the basis of the principle of conservation of energy. This means that anything that uses energy is changing the energy from one kind of energy to another.

So, the correct option is 'Energy is neither created nor destroyed, but it can change from one energy form to another'.

Which one of the following is the correct sequence of energy flower in an ecosystem?

botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. Herbivore-Carnivore-a Producer

  2. Carnivore-Herbivore-Decomposer

  3. Producer-Herbivore-Carnivore

  4. Decomposer-Carnivore-Herbivore

Show answer
Correct Option: A

Which law states that, conversion of energy from one form to another is not 100% efficient?

botany ecosystem : structure and function energy flow in food chain food chain and energy flow energy flow in ecosystem

  1. First law of thermodynamics

  2. Second law of thermodynamics

  3. Energy flow

  4. Biological system

Show answer
Correct Option: B