Food chain Quiz

This diagram shows a food web in a marine ecosystem, illustrating the interactions between various species. The web indicates the flow of energy from one organism to another, highlighting the dependencies and impacts different species have on each other.

Which of the following is true about this food web?

A. An increase in sharks would decrease codfish.
B. A decrease in zooplankton would increase herring.
C. An increase in seals would decrease sharks.
D. Codfish eat both seals and sharks.

This diagram shows a food web in the Alaskan tundra, illustrating the interactions between various species. The web indicates the flow of energy from one organism to another, highlighting the dependencies and impacts different species have on each other.

Keep in mind that the arrows point from the prey to the predator.

Which of the following would most likely happen if more bears were introduced in the population?

A. The wolf population would increase.
B. The caribou population would decrease.
C. The vegetation population would increase.
D. The hare population would decrease.

Food chains show the feeding relationships between living things. A food web is a network of interconnected food chains. It shows the energy flow through part of an ecosystem. In a food web, changes in the population of one organism have an effect on the populations of other organisms.

A food web is shown below.

Which of the following is a long-term effect on the removal of a snake from the ecosystem represented by this food web?

In an ecosystem, energy is transferred from one organism to another through a sequence known as a food chain. For example, grass transforms sunlight into usable energy via photosynthesis, a rabbit then consumes the grass to obtain energy, and a hawk might prey on the rabbit. Each organism in this chain plays a specific role, either as a producer, consumer, or decomposer. Producers like grass generate their own energy, consumers like rabbits and hawks obtain energy by eating other organisms, and decomposers break down dead matter, returning nutrients to the environment.

According to the passage, what role do producers play in an ecosystem?

A) They consume other organisms to get energy.
B) They decompose dead organic matter.
C) They produce usable energy through photosynthesis.
D) They increase the ecosystem’s carrying capacity.

Food webs depict the complexity of food chains by showing how multiple species in an ecosystem are interconnected and compete for the same food sources. Unlike a simple food chain, a food web provides a broader and more detailed picture of the ecological relationships and energy flow between organisms.

Question 2: Why is a food web considered more informative than a simple food chain?

A) It shows a single line of energy transfer between organisms.
B) It only includes producers and primary consumers.
C) It illustrates the complex interconnections between various organisms.
D) It focuses exclusively on the role of decomposers.

Overfishing can drastically impact lake ecosystems, as demonstrated when trout are removed faster than they can reproduce. This not only affects the food supply for predators like eagles and bears but also disrupts the ecological balance, leading to consequences such as algae overgrowth, reduced water clarity, and lower oxygen levels, which affect all aquatic life.

What are the consequences of overfishing trout in a lake ecosystem according to the passage?

A) Increased trout population and clearer water.
B) Disruption of food chains and ecological imbalance.
C) Reduced algae growth and increased aquatic plant life.
D) Enhanced water oxygen levels and healthier aquatic life.

A producer uses energy from the Sun to make food.
Which of these is NOT a producer?