Feb 25_Science_Do Now

Quiz
•
Science
•
7th Grade
•
Easy
Standards-aligned
Cynthia Beppu
Used 4+ times
FREE Resource
5 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A population of leopards lives in the jungle. Over 30 years, the size of the leopard population increased. What best explains the increase in the size of the leopard population?
Fewer leopards were born than died
A lot of leopards were born and none of them died
More leopards were born than died
Answer explanation
The increase in the leopard population is best explained by the fact that more leopards were born than died, indicating a successful reproduction rate that contributed to population growth.
Tags
PR Progress Build 1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A population of dolphins lives in the Gulf of Mexico. Over the last 75 years, the size of the dolphin population has decreased. What best explains the decrease in the size of the dolphin population?
The dolphin population is always decreasing because dolphin are always being eaten
fewer dolphins were born than died
more dolphins were born than died
Answer explanation
The decrease in the dolphin population is best explained by the fact that fewer bluefish were born than died. This imbalance in the food source affects the dolphins' survival and reproduction, leading to a decline in their population.
Tags
PR Progress Build 1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A population of penguins lives in Antarctica. Over the last 50 years, the size of the penguin population has remained stable. What best explains the stability in the size of the penguin population?
The birth rate and death rate of penguins are equal
More penguins are being born than are dying
Fewer penguins are being born than are dying
Answer explanation
The stability in the penguin population is best explained by the birth rate and death rate being equal. This balance ensures that the number of penguins remains constant over time, preventing population growth or decline.
Tags
PR Progress Build 1
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Scientists have been studying the size of three populations in a grassland. In this ecosystem, lizards eat fireflies, and fireflies eat gnats (a type of insect). The data showed that all three populations were stable. Then the lizard population decreased suddenly. What will most likely happen to the size of the firefly population as a result?
The firefly population will...
decrease. A decrease in any population causes a decrease in the sizes of all other populations in the ecosystem.
increase. The smaller lizard population will leave more energy storage molecules available for the firefly population to reproduce more. This will lead to more births in the firefly population.
increase. The smaller lizard population will need fewer energy storage molecules so they will eat fewer fireflies. This will lead to fewer deaths than births in the firefly population.
Answer explanation
The firefly population will increase because a smaller lizard population will consume fewer fireflies, leading to fewer deaths than births in the firefly population.
Tags
PR Progress Build 2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a nearby ecosystem, scientists have noticed a drastic decrease in the carrot population. What will likely happen to the size of the rabbit population as a result?
The size of the rabbit population will...
increase. The smaller carrot population will need fewer energy storage molecules so there will be more energy storage molecules available to the rabbit population.
decrease. The smaller carrot population will provide fewer energy storage molecules for the rabbit population, so the rabbit population will reproduce less. This will lead to fewer births than deaths in the wild pig population.
decrease. A decrease in any population causes a decrease in the sizes of all other populations in an ecosystem.
Answer explanation
The rabbit population will decrease because a smaller carrot population means fewer energy storage molecules available for rabbits. This leads to less reproduction, resulting in fewer births than deaths.
Tags
PR Progress Build 2
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