The rabbit population in a certain ecosystem sometimes decreases dramatically.
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Two students were sitting on a park bench at dusk, eating snacks. A mosquito landed on student A’s arm, and she slapped it. When she did that, she spilled a drink into student B’s lap, causing him to jump up.
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Study the tables below that show the results of a stimulus/response investigation. The object of the investigation is to see how quickly students can move their hands out of the way of a falling cup.
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Look at the list of organisms in the box.
Question 17
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1. Draw a food web to show how they interact. (In this ecosystem, ants and gophers both eat grass; lizards eat ants, and hawks eat lizards and gophers.) 2. Label each of the organisms in your food web to tell if they are producers, consumers, or decomposers.
Question 18
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Two students were talking. Student A was examining the lettuce leaves in a salad he was eating. He said, “Did you know that I am eating energy from the Sun?” Student B was eating a hamburger. She said, “Did you know that I am eating energy that came from the Sun, too?” Do you agree with these two students? Explain in words or with a drawing why you agree or disagree with each student.
Which organism best replaces the ??? in the food web shown above?
A producer
A consumer
A second-level consumer
A decomposer
One possible explanation for this decrease is _____.
an increase in the field mouse population
a decrease in the owl population
an increase in the grass population
an increase in the coyote population
Mark X next to the statements that describe how marine and terrestrial ecosystems are alike.
Both rely on the Sun as a source of energy.
Both rely on plants as the main producers.
Both include decomposers that breakdown dead material.
Both include consumers that eat plants and other animals.
What is the role played by redworms in an ecosystem? Mark X next to each sentence that is true.
They break down organic litter into tiny pieces.
They are the decomposers that reduce materials to simple minerals.
They help make room for air and water in soil.
Their main role is bait for fishing.
Which system found in animals is similar to the vascular system in plants?
Circulatory system
Digestive system
Respiratory system
Excretory system
Many organisms have features that attract the attention of other organisms. Mark X next to each phrase that describes why these features are important.
Attract consumers
Aid plant pollination
Aid seed dispersal
Warn of a bad taste
Aid tracking at night (especially bright colors)
Attract a mate
Distract predators
Warn when danger is near
Match the structures to their functions in the body. Drag an organ from the left side to its definition on the right side.
Heart
Kidney
Lung
Stomach
Capillary
Artery
Blood
Small Intestine
To reach every cell in the body
To pass nutrients from digested food into the blood
To filter waste products from the blood
To carry blood from the heart to the body
To exchange gases with the atmosphere
To carry oxygen, food, and nutrients through vessels
To pump blood throughout the body
To break down food with digestive juices and muscles
Mark X next to each function of the central nervous system.
Gathering information from the environment
Breaking food down into small pieces so it is easier to absorb
Contracting to make arms and legs move
Coordinating action from the brain to other parts of the body
What was the stimulus for student A?
The mosquito landing on an arm
Jumping up
The slapping motion
The drink spilling
What was the stimulus for student B
The mosquito landing on an arm
Jumping up
The slapping motion
The drink spilling
What was the response for student A
The mosquito landing on an arm
Jumping up
The slapping motion
The drink spilling
What was the response for student B?
The mosquito landing on an arm
Jumping up
The slapping motion
The drink spilling
Mark X next to the two words that correctly complete this sentence. “Plants get the materials they need for growth mainly from _____ and _____.”
Light and Nitrogen
Soil and Oxygen
Water and Carbon Dioxide
Soil and Nitrogen
What can communities do to improve the environment and help monarch butterflies survive?
Put bird baths in back yards to provide more water for the monarchs.
Make sure all grasses are cut short in the summer.
Use pesticides to kill as many other insects as possible.
Grow plants that butterflies can use for food.
Move instinct, learned, or reflex over to the correct situations:
Instinct
Learned
Reflex
Riding a skateboard
Bears hibernating in winter
Using a straw to drink
Using tools to gather food
Blinking when something comes toward you
Squirrels gathering acorns
Is this student right-handed or left-handed?
Right-handed
Left-handed
Does equally well with both hands
There is not enough information here to answer the question.
