Food Webs
1. Which of the following symbiotic relationships is considered parasitic?
ticks feeding on a dog
bees transporting pollen from flowers
pilotfish swimming under sharks
birds eating the insects from the back of a hippopotamus
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2. The diagram below shows some of the feeding relationships in a desert food web.
Which of the following trophic levels is not shown in this diagram?
producers
decomposers
primary consumers
secondary consumers
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3. A food web is shown below.
Which organism in this food web is a decomposer?
American plum
Golden mycena
Metallic wood borer
White-tailed deer
This online assessment item contains material that has been released to the public by the Massachusetts Department of Education.
4. Which of the following types of organisms would benefit most directly from the
products of decomposer organisms?
the decomposers themselves
the primary consumers
the secondary consumers
the producers
5. Oxygen is released into the air by
the Sun.
animals.
volcanoes.
plants.
6. The students in Mr. Smith's class wanted to learn about the ducks in a pond near their
school. Which question could the class answer by making observations at the pond?
Where do the ducks go when they migrate?
Which part of the pond do the ducks use for feeding?
How many ducks were there last May?
How many years have pairs of ducks been together?
7. Which organism is likely to be at the beginning of a food chain for a pond?
sunfish
freshwater shrimp
paramecium
green algae
8. The picture below shows the animal tracks Jeremy found by a riverbank.
Which of the following events probably took place in area X of the picture?
Animal 1 was eaten by animal 2.
Animal 2 flew away.
Animal 2 was eaten by animal 1.
Animal 1 stepped in the tracks of animal 2 when leaving area X.
9. In the presence of sunlight green plants give off
oxygen.
carbon dioxide.
nitrogen.
hydrogen.
10. Which statement is true about the relationship between bacteria and humans?
All bacteria are harmful to humans.
Some bacteria are harmful to humans and other bacteria are helpful.
All bacteria are helpful to humans.
Bacteria are neither helpful nor harmful to humans.
11. Which food is made with the help of bacteria?
yogurt
soda
bread
vinegar
12. Which substance is used by producers to make food?
nitrogen
oxygen
silicon
water
13. The food web below is similar to food webs found in wetlands in Georgia.
What is the original source of the MATTER that the otter uses as food?
nightjar
trout
the Sun
waterweed
14. Look at the food web below.
What would MOST LIKELY happen in the ecosystem if the population of maned geese
greatly increased?
The lizards would have less competition.
The kookaburras would have more competition.
The amount of available food for the frogs would increase.
The amount of available food for the insects would decrease.
15. Which of these BEST explains why predators need plants, such as grass, in their
ecosystems?
Plants are a large part of their diets.
Plants provide safety for the predators.
Plants break down the organisms that the predators eat.
Plants provide food for the animals that the predators eat.
16. Photosynthesis is the way plants make food. Which of the following are always
needed for photosynthesis?
water, light, chlorophyll, carbon dioxide
water, light, flowers, oxygen
water, roots, stems, leaves
water, light, fertilizer, oxygen
17.
The process in which green plants convert energy from the Sun into energy stored
in carbon-containing molecules is called
respiration.
combustion.
digestion.
photosynthesis.
18. A pyramid can be used to illustrate the flow of energy through a food chain. Which
shows the correct order of the organisms in an energy pyramid?
19. During photosynthesis, green plants remove a substance from the air. The substance
is
water.
oxygen.
sulfur dioxide.
carbon dioxide.
20. The process by which producers make their own food is called
diffusion.
photosynthesis.
respiration.
reproduction.
21. The organisms in the freshwater marsh habitat below belong to the same food web.
What source of energy fuels this entire food web?
the blue heron
the dragonfly
the cattails
the Sun
22. Look at the food web below.
According to this food web, how do shrimp and crabs obtain energy?
by eating producers
by eating consumers
by turning light into food
by releasing carbon dioxide
23. What is the role of the Sun in a forest ecosystem?
It decomposes wastes into nutrients.
It gives chlorophyll to the producers.
It allows oxygen to be formed in the animals.
It provides the energy for all living organisms.
24. Albert is studying food web relationships in wetland ecosystems. He learned that
hawks feed on shrews and shrews feed on cattails. What is the original source of energy
for wetland ecosystems?
plants
insects
the Sun
predators
25. The diagram below is of a food web in a southern salt marsh.
When the snails feed on a type of fungus that grows on the cordgrass, they scrape and
damage the cordgrass. What would MOST LIKELY happen in this food web if the
number of blue crabs suddenly decreased?
The number of fish would decrease as the snails ate more of them.
The Sun would need to provide more energy to power the entire web.
The cordgrass would have more room and the fungus available would increase.
The number of snails would increase and result in more damage to the cordgrass.
26. Which of these is the missing component of the food web shown below?
goose
sunlight
fish
hawk
27. What is the original source of energy for the organisms in the picture below?
grass
mouse
water
sunlight
28. Based on the picture, which of the following is a producer in the food chain?
Cattails, because they make their own food.
Beaver, because they can change the water level.
Dragonflies, because they occur in high numbers.
Soil, because all other organisms depend on it.
29. Autotrophs are organisms that produce their own food. Which do scientists classify as
autotrophs?
chordates
fungi
plants
molds
30.
What is the first source of energy for all food webs?
plants
sunlight
minerals in the soil
decomposers and recyclers
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