Photosynthesis
What do plants take from the air that helps them make food?
A. oxygen
B. nitrogen
C. carbon dioxide
D. hydrogen peroxide
C. carbon dioxide
Which species is an herbivore, and why?
A. Owls. They eat frogs and mice.
B. Mice. They eat plants and grasshoppers.
C. Hawks. They eat snakes.
D. Grasshoppers. They eat green plants.
D. Grasshoppers. They eat green plants.
Starting with a producer, which food chain is in the correct order?
A. grass → grasshopper → frog → snake → eagle
B. eagle → snake → frog → grasshopper → grass
C. grasshopper → grass → frog → snake → eagle
D. grass → grasshopper → frog → eagle → snake
A. grass → grasshopper → frog → snake → eagle
Imagine that the rainforest had received less sunlight than usual. What would be affected by this change first?
A. carnivores
B. consumers
C. herbivores
D. producers
D. producers
In an ecosystem, there are living and non-living things. Which is an example of a non-living thing?
A. air
B. grass
C. mice
d. trees
A. air
Which of these is a waste product of plants during photosynthesis?
A. carbon dioxide
B. oxygen
C. heat
D. water
B. oxygen
What is the main purpose of decomposers in an ecosystem?
A. to convert sunlight into energy
B. to dispose of waste matter in the environment
C. to make food for the animals
D. to take in carbon dioxide and give off oxygen
B. to dispose of waste matter in the environment
flower --> caterpillar --> frog --> owl
Which statement best predicts what would happen to the frog population if the caterpillar population decreased?
A. The frog population would become extinct.
B. The frog population would remain the same.
C. The frog population would increase.
D. The frog population would decrease.
D. The frog population would decrease.
Larry read that a local forest mostly had big trees and some small plants. What would happen if most of the big trees are cut?
A. The forest will turn into a desert.
B. The small plants will grow in number.
C. The small plants will reduce in number.
D. The forest will experience more wildfires.
B. The small plants will grow in number.
Grizzly bears eat salmon. What would most likely happen if humans removed a large number of salmon from the bear's habitat through fishing?
A. The number of grizzly bears would increase.
B. The number of grizzly bears would decrease.
C. The salmon population would reproduce more often.
D. The humans would become prey to grizzly bears.
B. The number of grizzly bears would decrease.
What does photosynthesis produce that helps plants grow?
A. water
B. oxygen
C. protein
D. sugar
D. sugar
If the number of producers in an ecosystem decreases, which type of organisms would be affected first?
A. carnivores
B. decomposers
C.herbivores
D. omnivores
C.herbivores
sunlight --> green plants --> fish --> shark
If the sunlight stopped shining on the ecosystem, which would most likely happen?
A. The green plants, the fish, and the sharks would all die.
B. The green plants would die, but the fish and sharks would grow.
C. The green plants would grow, but the fish and sharks would die.
D. The green plants, the fish, and the sharks would all grow.
A. The green plants, the fish, and the sharks would all die.
Mr. McGregor has planted twice as many vegetable plants in his garden this year than last year. Which event will most likely occur because of the extra plants in Mr. McGregor's garden?
A. The populations of animals that consume the garden plants will decrease because there will be greater competition for food.
B. The populations of animals that consume the garden plants will remain the same because the size of the garden will not affect the populations of animals.
C. The populations of animals that consume the garden plants will increase because of the increase in the food supply.
D. The populations of animals that consume the garden plants will increase because the larger garden will attract more predators.
C. The populations of animals that consume the garden plants will increase because of the increase in the food supply.
What is the primary source of energy in most living communities?
A. animal
B. plant
C. soil
D. sun
D. sun
Plankton are tiny ocean animals. They use energy from the sun to produce food that other animals eat through photosynthesis. Which organism in the ocean has the same role as the plankton?
A. seaweed
B. turtle
C. crab
D. dolphin
A. seaweed
If there were no decomposers in the ecosystem, what would happen?
A. An animal would become a decomposer.
B. Plants would become decomposers.
C. The ecosystem would experience no changes.
D. The nutrients in the ecosystem would decrease.
D. The nutrients in the ecosystem would decrease.
Grasshoppers eat grass. Birds eat grasshoppers and grains. Snakes eat birds. Eagles eat snakes.
Which of these animals is an omnivore?
A. grasshoppers
B. birds
C. snakes
D. eagles
B. birds
Ryan loved to watch the deer in the wooded area beside his house. He became concerned when he started seeing fewer deer. Ryan's dad explained the reason for their disappearance. What reason could Ryan's dad have given?
A. There was no vegetation in the area for them to eat.
B. There were no other animals left in the area.
C.There were no predators left in the area.
D. There were no decomposers left in the area.
A. There was no vegetation in the area for them to eat.
Where does energy originate that is needed to maintain an ecosystem?
A. plants
B. soil
C. sun
D. water
C. sun
In an experiment, one tomato plant is placed in the sun, and one is placed in the shade. Which plant will produce more tomatoes?
A. the one in the shade because it will be protected from the heat
B. the one in the sun because more photosynthesis will occur
C. the one in the shade because fewer insects will bother it
D. the one in the sun because the sun will ripen the tomatoes faster
B. the one in the sun because more photosynthesis will occur
Teacher will tell you if you are correct.
What do the arrows represent in a food chain or food web?
A. sunlight
B. energy
C. food
D. sugar
B. energy
The year after a hurricane knocked down most of the trees in Mrs. Whitfield's yard, she noticed her lawn was much greener. What was the most likely reason for this?
A. The trees were blocking the sunlight from reaching the grass.
B. The trees' leaves were absorbing the rain so the grass got too little moisture.
C. The trees created a habitat for insects that were damaging to the grass.
D. The trees' leaves covered the grass when they fell in autumn.
A. The trees were blocking the sunlight from reaching the grass.
In a forest ecosystem, a hawk is a predator, and its prey is a mouse. What will most likely happen if the number of hawks declines?
A. The number of mice will barely decrease.
B. The number of mice will greatly decrease.
C. The number of mice will stay the same.
D. The number of mice will increase.
D. The number of mice will increase.