WorksheetsNine Weeks Review
Total questions: 23
Worksheet time: 1hrs 4mins
When an animal dies, the once-living matter from the animal's body
remains exactly the same for millions of years.
is broken down and passes into the soil and air.
disintegrates into small particles that eventually disappear.
Like other consumers, all of the food energy that humans use once came from the
sun
soil
ocean
Which of the following is a type of waste created by consumers?
blood vessels
digestive juice
carbon dioxide
Bacteria have no way to store excess food, so in order to stay active, they
store excess food as sugar like animals do.
live in places where they can be surrounded by food sources.
stay close to fungi and get energy from them.
When a decomposer dies, its once-living material becomes waste. These wastes are then
released into the air, soil and water of an ecosystem.
converted into energy that can be used.
further decomposed by producers and consumers.
you build a compost pile using kitchen waste like egg shells and banana peels. Three weeks later, you check your compost. Which of the following observations is the best evidence of decomposition?
There was no color change.
The kitchen scraps became smaller over time.
The kitchen scraps and container became cold in temperature.
Which of the following describes the relationship between moisture and mold growth in your study?
Moisture slows down the rate of mold growth.
Moisture speeds up the rate of mold growth.
Moisture is not required for mold growth.
Decomposers need resources in order to grow and give off waste products. Which of the following is another way to measure mold growth each day of the experiment?
Measure the amount of water contained in the plastic bag.
Measure the amount of sugar contained in the plastic bag.
Measure how much the sealed bags expand due to carbon dioxide release.
Sharks are the highest-level consumers in the ocean, but because humans hunt them for food, their populations are decreasing by about 100 million sharks per year. You have to choose to make a model of a food chain or a food web to show how the loss of sharks might affect this coral reef. Which is the best choice and why?
A food web is the best because it shows many foods that the shark eats.
A food chain is the best because a food chain shows only one food that the shark eats.
A food web is best because only food webs show how humans can change ecosystems.
A food chain is best because it only shows consumers, while food webs, show producers and consumers.
Producers, consumers, and decomposers use and recycle matter in an ecosystem. Carbon is solid matter that is recycled. Carbon dioxide and oxygen are gases that are recycled. How should the gray, purple and brown arrows be labeled to complete the model shown?
A. gray: carbon dioxide; purple: oxygen; brown :carbon
B. gray: oxygen; purple: carbon dioxide; brown : carbon
C. gray: carbon dioxide; purple; carbon dioxide; brown: oxygen
D. gray: carbon; purple: carbon dioxide; brown: oxygen
Lake Michigan is one of the Great Lakes. A team of scientists wanted to investigate how animals that were accidentally brought there now affect the Lake Michigan food web. To do so, they had to learn what each of these animals eats in its new home. After investigating the animals of Lake Michigan, the scientists were able to develop a food web, like the one shown. What do the green arrows show on this food web?
They point in the direction the energy goes from the consumers to the decomposers.
They point in the direction to where to producers get their matter and energy from.
They point in the direction the energy goes from producers to consumers.
During photosynthesis, plants produce sugar and _____.
carbon dioxide
light
oxygen
Energy enters most ecosystems as ______.
moving air
water
sunlight
In his experiment, Jan van Helmont concluded that
trees grow better in wet soil than dry soil
trees do not get the matter they use for growth from soil.
trees convert matter from carbon dioxide into soil.
Kiara brought home a new plant from the nursery. She put it near the window in her room where it would get lots of sunlight. She knew that, like all producers, plants need energy to make food. They also need matter. Where does this matter come from?
from animals
from sunlight and soil
from carbon dioxide and water
Consumers can use the materials and energy from food to
grow larger
reproduce
all the above
Identify each correct food chain that demonstrates the energy flow of this food web.
Eagle ⇨ bluebird ⇨ lizard
Plant ⇨ bluebird ⇨ eagle
Plant ⇨ eagle ⇨ rabbit
Snail ⇨ plant ⇨ lizard ⇨ eagle
Cattle farmers need almost two football fields of grassland to feed just one animal for a year. How much of the energy at the base of the pyramid shown reaches the top (humans) and why?
All of it; unlike matter, energy cannot be consumed or destroyed.
None of it; cows release all of the grass's energy as heat, then create their own, new energy.
Some of it; both the grass and cattle release some energy as heat before it reaches the human consumer.
Most of it; cattle release some energy as heat, the grass does not release energy as heat.
American may not live in the ocean or in a tropical rainforest, but they consume food from those ecosystem. Chocolate comes from cacao beans that grow in rainforests. Tuna salad comes from tuna that live in the ocean. How do Americans fit in to the food chains and food webs of these ecosystems?
Humans are part of many food chains, but only one food web.
Humans are only consumers in the ecosystems where they currently live.
Humans are the highest-level consumers in many food webs because we eat food from around the world.
Humans are both consumers and producers in many food webs, because we grow energy-plants.
Which of the following BEST describes what the food chain models?
The loss of energy through heat.
The many connected feeding relationships
How much energy is passed on to each level.
The path of energy through the ecosystem.
If a rabbit population was removed from a food web, what would happen to the food web?
There would be less snakes to eat them.
The producers would grow more.
There would be more snakes to eat them.
All organisms would be affected.
In this food chain the arrows represent what?
What eats what.
The cycle of matter.
The animals are moving.
The flow of energy.
The sea lamprey feed on Lake Michigan's highest-stage consumers. It latches onto larger fish and uses its sharp tongue to poke a hole through the fish's skin, stealing their blood. You can see two long black sea lampreys attached to a trout in the photo. Why do you think the sea lamprey chooses to feed on large fish lie trout and salmon, and not smaller fish like smelt or perch?
Smaller fish store more energy than larger fish.
Larger fish store more energy than smaller fish.
Answers A and b are correct.
Smaller fish and larger fish store the same amount of energy.
