Scientist and Engineers Unit
Which is an example of the type of work an engineer would do?
A. Observe the eating habits of catfish
B. Write an article explaining the harm of eating foods high in fat
C. Construct a plastic spoon that breaks down in the environment
D. Conduct an investigation to determine a vaccine for a disease like COVID-19
C. Construct a plastic spoon that breaks down in the environment
The formula CO2 represents one _____ of carbon dioxide.
A. atom
B. molecule
C. ion
D. isotope
B. molecule
Photosynthesis is the process where green plants, algae, and some bacteria use sunlight, water, and carbon dioxide to create their own food (glucose) and release oxygen. It occurs in the _________, using chlorophyll to transform light energy into chemical energy.
Fill in the blank.
chloroplasts
Which of these statements best describes prey?
A. Prey refers to animals that are hunted and eaten
B. Prey refers to plants that are found and eaten
C. Prey refers to animals or plants that are hunted and eaten
D. Prey are neither plants nor animals
A. Prey refers to animals that are hunted and eaten
In a grassland ecosystem, field mice are eaten by snakes.
Which factor is most likely responsible for the decline of the field mice population?
A. lack of space
B. lack of sunlight
C. increase in temperature
D. increase in predators
D. increase in predators
A person studies volcanoes to learn why eruptions happen. What role does this person have?
A. Engineer
B. Scientist
B. Scientist
A molecule is _______
A. two or more substances that are mixed together
B. two or more atoms that are chemically bonded together
C. a particle found in the nucleus of an atom
D. the smallest part of an element that still has the properties of that element
B. two or more atoms that are chemically bonded together
__________
make their own food.Some use energy from chemicals in the environment but most use energy from the sun in a process known as photosynthesis. During this process organisms take carbon dioxide gas out of the atmosphere and water from the environment. They combine them to store energy as sugar. In the process, they create ________ as a waste product that helps animals and many other organisms to gain energy from their own food.
Fill in the blanks.
A. Producers , Oxygen
B. Producer, Sugar
C. Consumer, Oxygen
D. Consumer, Sugar
A. Producers , Oxygen
A graph in science class shows how a prey species (the rabbit) increases in population size when the predator species (the coyote) declines.
Which factor is responsible for the increase in the rabbit population. Choose the best possible answer.
A. decrease in space
B. increase in predators
C. decrease in predators
D. increase in temperature
C. decrease in predators
If all of the predators in an ecosystem are killed off, what happens to organisms that are their food source?
A. The number of remaining organisms decreases
B. The number of organisms increases
C. The number of organisms reaches a balance and stays the same
D. Some of the consumers evolve into predators
B. The number of organisms increases
Which is an example of the type of work a scientist would do?
A. Design a roller coaster
B. Construct a prototype for a satellite
C. Develop a lighter material for bike frames
D. Observe the migration and flight path of birds
D. Observe the migration and flight path of birds
Which of the following represents a molecule?
A. Ca
B. Co
C. CO
D. Cu
C. CO
What are C6H12O6 (glucose) and O2 (oxygen) converted into in cellular respiration?
A. CO2 (carbon dioxide) only
B. H2O (water) only
C. CO2 (carbon dioxide) and H2O (water)
D. Neither CO2 (carbon dioxide) nor H2O (water)
C. CO2 (carbon dioxide) and H2O (water)
Herbivores are plant-eating animals, while carnivores are meat-eating animals. If perfect growing conditions allowed a population of producers to grow and increase, which of the following changes in the food web would be expected initially?
A. The population size of carnivores in the food web would decrease
B. The population size of the herbivores in the food web would decrease
C. New populations of herbivores would enter the food web
D. Members of the carnivore population would leave the food web
C. New populations of herbivores would enter the food web
A certain species of owl lives only in old growth forests. If the trees where these owls live are cut down by humans, what will most likely happen to the owl population?
A. It will decrease to the point of extinction
B. It will hibernate until the trees grow back
C. It will increase in number
D. It will evolve into a new species
A. It will decrease to the point of extinction
A person designs a stronger bridge that can hold more cars safely. What role does this person have?
A. Scientist
B. Engineer
B. Engineer
A scientist melted 10 grams of solid bronze to form liquid bronze.
Which statement best describes the mass of the liquid bronze?
A. 10 grams because the liquid will take up the same volume as the solid
B. 10 grams because the same number of atoms will be present in the liquid and solid
C. Slightly less than 10 grams because the density of the liquid will be less than the density of the solid
D. Slightly more than 10 grams because the kinetic energy of the atoms will be greater in the liquid than in the solid
B. 10 grams because the same number of atoms will be present in the liquid and solid
Cellular Respiration begins with reactants and ends when the products are created.
Name the cellular respiration reactants:
A. Oxygen and Water
B. Oxygen and Sugar
C. Sugar and Water
D. Energy and Sugar
B. Oxygen and Sugar
In a forest, wolves feed on moose. The graph below shows a sudden decline in the wolf population due to the outbreak of a disease after the 1980s.
What effect will this decline have on the forest ecosystem? Choose the best answer.
A. The moose population will increase indefinitely
B. There will be less competition among the moose for food
C. There will be more competition among the moose for food
D. There will be more competition among the wolves for food
C. There will be more competition among the moose for food
Describe the difference between overpopulation and underpopulation.
A. Overpopulation means people move away from cities, while underpopulation means cities become crowded.
B. Overpopulation only happens in small countries, while underpopulation only happens in large countries.
C. Overpopulation happens when there are too many people for available resources, while underpopulation happens when there are too few people to support an area’s needs.
D. Overpopulation and underpopulation mean the exact same thing.
C. Overpopulation happens when there are too many people for available resources, while underpopulation happens when there are too few people to support an area’s needs.
A person tests different soils to discover which one helps plants grow best. What role does this person have?
A. Scientist
B. Engineer
A. Scientist
A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?
A. The mass of the balloon increases because the size of the balloon has increased
B. The mass of the balloon increases because the temperature of the balloon has increased
C. The mass of the balloon decreases because the temperature of the balloon increased
D. The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up
D. The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up
Cellular Respiration begins with reactants and ends when the products are created.
Name the cellular respiration products:
A. Hydrogen, Water (H2O), and Energy
B. Carbon dioxide (CO2), Water (H2O), and Sugar (glucose)
C. Carbon dioxide (CO2), Water (H2O), and Energy
D. Nitrogen, Water (H2O), and Energy
C. Carbon dioxide (CO2), Water (H2O), and Energy
Which of these best describes predator/prey relationships?
A. The relationship harms the predator species and benefits the prey species
B. The relationship benefits the predator species and harms the prey species
C. The relationship harms both predator and prey species
D. The relationship benefits both the predator and prey species
B. The relationship benefits the predator species and harms the prey species
What will happen if the ecosystem becomes overpopulated?
A. There will be shortage of food and water only
B. There will be a shortage of food and space only
C. There will be shortage of water and space only
D. There will be shortage of water, food, and space
D. There will be shortage of water, food, and space