CSS - PMS - CCE - PCS - General Science
Food Chain
Which arrow direction is conventionally used in a food chain?
A. Toward the Sun only
B. Always from predator to prey
C. No arrows are used
D. From the organism being eaten toward the organism that obtains the energy
Correct Answer: D
Food-chain arrows indicate the direction of energy transfer.
CSS - PMS - CCE - PCS - General Science
Food Chain
What is biomagnification?
A. Increase in concentration of certain persistent pollutants at higher trophic levels
B. Conversion of pollutants into nutrients
C. Increase in body size in every food chain
D. Loss of all chemicals at higher levels
Correct Answer: A
Persistent bioaccumulative substances can become more concentrated in predators high in food webs.
CSS - PMS - CCE - PCS - General Science
Food Chain
If grass is eaten by a rabbit and the rabbit by a fox, what trophic role does the rabbit have?
A. Decomposer
B. Primary consumer
C. Secondary consumer
D. Producer
Correct Answer: B
The rabbit feeds directly on the producer grass.
CSS - PMS - CCE - PCS - General Science
Food Chain
What role do decomposers play in food chains and webs?
A. They eliminate all consumers
B. They stop nutrient cycling
C. They manufacture sunlight
D. They break down dead matter and recycle nutrients
Correct Answer: D
Decomposers return nutrients from dead organisms and wastes to the environment.
CSS - PMS - CCE - PCS - General Science
Food Chain
What is a food web?
A. A network of interconnected food chains
B. A plant root system
C. A single linear feeding pathway only
D. A spider web only
Correct Answer: A
Food webs show multiple feeding interactions in a community.
CSS - PMS - CCE - PCS - General Science
Food Chain
Why are food chains usually limited in length?
A. Energy increases at every level
B. Only a fraction of energy is transferred to each higher trophic level
C. Predators have no energy needs
D. Producers contain no energy
Correct Answer: B
Large energy losses between trophic levels constrain the number of levels that can be supported.
CSS - PMS - CCE - PCS - General Science
Food Chain
Which organisms occupy the first trophic level?
A. Top predators
B. Primary consumers
C. Producers
D. Secondary consumers
Correct Answer: C
Primary producers form trophic level one.
CSS - PMS - CCE - PCS - General Science
Food Chain
What is a primary consumer?
A. An organism that feeds directly on producers
B. A decomposer only
C. An organism that makes its own food
D. An organism that eats only top predators
Correct Answer: A
Herbivores are typical primary consumers.
CSS - PMS - CCE - PCS - General Science
Food Chain
At the base of most food chains are what organisms?
A. Decomposers only
B. Primary producers
C. Parasites only
D. Top predators
Correct Answer: B
Plants, algae and other autotrophs capture energy and form the base of most food chains.
CSS - PMS - CCE - PCS - General Science
Food Chain
What does a food chain show?
A. Only water movement
B. A list of animal names with no relation
C. A linear pathway of energy and nutrient transfer through feeding relationships
D. Only mineral formation
Correct Answer: C
Food chains represent who eats whom and the direction of energy transfer.