
Crayfish Unit Review
Authored by Lindsey Shirey
Science
2nd - 4th Grade
Used 9+ times

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9 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Before the 1800s in the city of Leeds, England, peppered moths that lived in trees were mostly white or mostly black. In the 1800s, many factories sent a lot of black coal smoke into the air. The smoke turned the white-trunked trees black. After many years, the population of moths was mostly black.
Which statement most likely explains why there were more black moths after coal started being used?
Adult moths that were mostly black survived, laid eggs, and had offspring that looked like their parents.
The white moths learned how to change their color to hide from predators.
The moths that were mostly white knew they would be easy prey, so they flew away to a place with cleaner air.
The white moths were covered with coal smoke, so they turned black.
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A teacher asked a class, “Would it be a good idea to let a family of plant-eating frogs from South America into the environment represented in the food chain?”
Yes, because with more frogs, the snakes and owls will have more to eat.
Yes, because I read that frogs keep caterpillars under control so they don’t eat up too many leaves.
No, because our teacher told us not to let animals from other places go in our area.
No, because when the new frogs eat plants the other animals might have less to eat.
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
About 100 years ago, farmers on a few islands in Hawaii
brought mongooses from Asia to kill the many rats in their sugarcane fields. Which is the best advice for farmers on other Hawaiian islands who are thinking about controlling rats with mongooses?
It is a bad idea. Mongooses are active during the day and rats are active at night.
It is a great idea. Mongooses love to eat rats. Then you will have fewer rats.
It is a bad idea. Mongooses are not native to Hawaii and might eat animals other than rats, too.
It is a great idea. Mongooses live under the ground, so you won’t see them often.
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Populations of brown, green-brown, and green walking sticks lived in the forest. Then the environment changed. Students collected data about five generations of walking sticks in the new environment.
From the data in the table, you can make the claim that the new environment probably had _____.
mostly green leaves
more brown leaves than green leaves
an even mix of green leaves and brown leaves
more green leaves than brown leaves
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In class we learned that crayfish often hide under rocks so predators won’t see them. Frogs hide under lily pads during the day. The most likely reason frogs hide under lily pads is that _____.
they don’t like sunlight
they find food to eat there
they are protected from predators
they see better in dark places
6.
MULTIPLE SELECT QUESTION
1 min • 1 pt
In the spring, a water insect that lives in streams lays eggs. The eggs hatch, and there are many baby insects. Then it is unusually hot for a few weeks. Check the box next to each statement that will most likely happen as a result of the change in temperature.
All the insects will die.
Some insects will die.
Some insects will move to cool shady spots in the stream to live.
Some insects will grow faster in the warmer stream water.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Some animals lay a huge number of eggs _____.
so enough survive and grow into adults
because they like having big families
so the babies will have brothers and sisters to play with
because they want other animals to have plenty of food to eat
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