In an ecosystem, if a species of secondary consumers is affected by a deadly disease, this will affect the ecosystem by _________.
giving more opportunity of survival to the prey of the secondary consumer
giving more opportunity of survival to the predators of the secondary consumer
disturbing the food chain of which the secondary consumer is a part
decreasing the population of the producers
(3)
Change in the population of the organism at any trophic level can distress the whole food chain in the ecosystem. This can be detrimental to the balance of energy transfer in the ecosystem.
Identify A, B and C in the given food chain.
A: Phytoplanktons; B: Zooplanktons; C: Small fish
A: Zooplanktons; B: Phytoplanktons; C: Small fish
A: Zooplanktons; B: Small fish; C: Phytoplanktons
A: Phytoplanktons; B: Small fish; C: Zooplanktons
(1)
The correct sequence of the food chain is:
The most important trophic level in a terrestrial food chain is:
the one with the highest energy requirement per individual
the one with the least energy requirement per individual
the one with moderate energy requirement per individual
not dependent on the energy requirement per individual, thus, all are equally important
(4)
In any food chain, all the trophic levels are of equal importance. They maintain ecological balance.
Which food chain is NOT a part of the given food web?
(2)
The given image shows a food web in the ecosystem. A food web is formed when the different food chains are interconnected in the ecosystem. Food chain comprising:
is not the part of this food web.
The maximum number of levels in a food chain can be:
7–8
5–6
3–4
1–3
(3)
At each trophic level, some amount of energy is lost; hence, food chains can have maximum 3–4 trophic levels. After four levels, there is no significant amount of energy left to pass on.
A large number of food chains are interconnected because the organisms at the higher trophic level can depend on different types of organisms at the lower trophic level. The existence of this phenomenon in nature is called:
food chain
ecological balance
ecological pyramid
food web
(4)
Different food chains interconnect to form food webs.
Which of these is NOT a correct sequence of a food chain?
(4)
Phytoplanktons are the primary producers. They should occupy the first trophic level in the aquatic food chain.
Flow of energy in an ecosystem is always:
unidirectional
bidirectional
multidirectional
no-specific direction
(1)
The energy flow in an ecosystem is always unidirectional. Energy coming from the sun in most natural ecosystems, is used by producers, and then passed on to subsequent trophic levels in the form of food. Energy never flows in the reverse direction, it always gets transferred from the prey to the predator.
In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of:
heat energy
light energy
mechanical energy
chemical energy
(4)
The sun is the ultimate source of energy in an ecosystem, and green plants capture it and convert it to chemical energy, which is then stored in the form of carbohydrates. This chemical energy, in the form of food, is transmitted down the food chain in the ecosystem from one trophic level to the next following 10 per cent law according to which only 10% of the chemical energy is transferred from one trophic level to subsequent higher trophic level.
Which of the following statements holds true for the energy flow in an ecosystem?
Energy can never be transferred bi-directionally between producers to consumers.
Energy flows in a unidirectional manner in an ecosystem.
Only 10% of the energy is transferred from one trophic level to the next trophic level.
All of the above
(4)
The flow of energy is always unidirectional. It flows from the sun to the producers and ultimately to the consumers. According to the 10% law, only 10% of the energy is transferred from one trophic level to the next.
