Tag: organisms and their environment

Quizzes (10) Questions (13)

Questions Related to organisms and their environment

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

What happens in biological magnification?

  1. A progressive increase in the level of energy transferred through trophic levels

  2. A progressive increase in the body weight through trophic levels

  3. A progressive increase in the number of organisms through trophic levels

  4. A progressive increase in the amount of harmful substances through trophic levels
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biomagnification (or bioaccumulation) refers to the ability of living organisms to accumulate certain chemicals to a concentration larger than that occurring in their inorganic, non-living environment, or in the case of animals, in the food that they eat.  The contaminants include heavy metals namely mercury, arsenic, pesticides such as DDT, and polychlorinated biphenyls (PCBs) compounds which are then taken up by organisms because of the food they consume or the intoxication of their environment. These materials are highly present in a variety of household and industrial chemicals. The harmful substances then build up inside the organism’s cells. When organisms in the higher food chain consume the organisms containing the toxins below their trophic levels, the toxins gradually become concentrated in the higher food chain. Because this is a repetitive process in the ecosystem and throughout the entire food chain, the higher organisms are the ones that will accumulate most of the toxins.

So the correct option is 'a progressive increase in the level of energy transferred through trophic levels'.

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

As energy is passed from one trophic level to another, the amount of usable energy

  1. increases

  2. decreases

  3. remains the same

  4. energy is not passed from one trophical level to another
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The transfer of energy from one trophic level to next trophic level follows 10 percent law known as Lindeman's law of trophic efficiency which states that the efficiency of energy transferred from one trophic level to the next higher trophic level is about 10%. Rest of the energy is lost in respiration. So the energy decreases as it is transferred to subsequent trophic levels.
So, the correct answer is 'decreases'.
Multiple choice botany organisms and their environment energy flow in food chain food chain and energy flow energy flow in ecosystem

Which level in food chain has maximum energy?

  1. Third Trophic Level

  2. Decomposers

  3. Herbivores

  4. First Tropic Level
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to the ten percent law of energy transfer in ecosystems, energy decreases at each successive trophic level. Therefore, producers at the first trophic level possess the maximum amount of energy.

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

Choose the correct answers from the alternatives given .
Endergonic reactions

  1. are always coupling reactions

  2. can only occur if there is an input of energy

  3. have products with less free energy than the reactants

  4. all of the above are correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Endergonic needs an input of energy to create the products, which have more free energy as a whole than the sum of free energy of each of the reactants. An example of this type of reaction in biology is photosynthesis. This process depends on the reaction to absorb energy in the form of sunshine from the surroundings for it to occur. 
So, the correct option is 'can only occur if there is an input of energy'. 

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

Choose the correct answers from the alternatives given .
A living organism represents stored energy in the form of chemical compounds When an organism dies, what happens to.that stored energy?

  1. All chemicals immediately lose their high-energy bonds

  2. All molecules immediately degrade into basic elements

  3. All energy immediately leaves, and that is. one manifestation that the organism is dead

  4. Chemical compounds in cells lose their organisation over time because there is no longer an input of energy to maintain the organised state
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There is constant input of energy needed for all the activities that go inside a living organism. Food is the source of this energy. When an organism dies, these activities or reactions are stopped which results in loss of organisation of chemical compounds in cells. 

So, the correct option is 'Chemical compounds in cells lose their organisation over time because there is no longer an input of energy to maintain the organised state'.

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

State whether the following statements are true or false .
An open system has access to environment for matter and energy.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 An open system is a system that has external interactions. An open system is defined as a system in exchange of matter with its environment, presenting import and export of matter and energy.

So, the correct option is 'True'.