NC 8th Grade EOG Review 2: Question Preview (ID: 25533)

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Which would best allow a species to survive environmental changes?
a) similar physical features
b) low mutation rate
c) small population
d) genetic diversity

In the winter, the fur of the arctic fox is white. In summer, the fur darkens to a reddish brown. What most likely causes the fur of the fox to change color?
a) the amount of sunlight present
b) the fox’s habitat
c) the fox’s genes
d) the fox’s age

Where do plants get most of the energy they need to live and grow?
a) water
b) soil
c) air
d) sunlight

Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?
a) They swim the same way.
b) They eat the same food.
c) They live in the same area of the ocean.
d) They have similar anatomies.

If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live?
a) The population of deer will increase.
b) The population of deer will decrease.
c) The population of deer will remain the same.
d) The population of deer will become extinct.

Which is a way the agricultural biotechnology industry could have a positive impact on the environment?
a) by producing crops that are virus resistant
b) by making robots to replace large farm machines
c) by reducing the need for countries to import food
d) by increasing the use of wind farms that produce electricity

Which best explains the importance of nitrogen in the cycling of energy and matter?
a) Nitrogen increases protein production in plants.
b) Nitrogen decreases protein production in plants.
c) Nitrogen decreases the effectiveness of photosynthesis.
d) Nitrogen increases the effectiveness of photosynthesis.

Which is the best way to help prevent the flu from becoming a pandemic?
a) getting a vaccination
b) taking antibiotics
c) eating fruits and vegetables
d) washing hands often

Ten people became sick with the flu after attending a school dance. What is the scenario that could best explain how the people got sick?
a) contact with environmental sources
b) contact with an infected animal
c) contact with a contaminated object
d) contact with an infected person

If a body of water has high turbidity levels, what can most likely be concluded?
a) It has a low pH.
b) It is unsafe to drink.
c) It is too hot to drink.
d) It contains a lot of chemicals.

Scientists find dinosaur fossils in the bottom rock layers of a cliff and mammal fossils in the middle rock layer of the cliff. Which could best be concluded from this evidence?
a) Dinosaurs ate plants.
b) Dinosaurs were eaten by the mammals.
c) Dinosaurs lived on Earth before the mammals.
d) Dinosaurs and mammals lived at the same time.

In which oceanic zone do clams and crabs survive by burrowing in the sand?
a) oceanic
b) intertidal
c) open ocean
d) deep ocean

Why is water from an aquifer more likely to be cleaner than water from other sources?
a) because it forms where fresh and salt water meet
b) because it receives water directly from precipitation
c) because it rises to the surface near the ocean
d) because pollutants are filtered by rock and soil deep within Earth

Which is a possible disadvantage of using flowing water to produce electricity?
a) ecosystem damage and loss of land
b) reduced carbon dioxide emission
c) only suitable for industrial use
d) creates reservoirs

Which pair of elements has the most similar properties?
a) N and P
b) Li and B
c) I and Ca
d) K and He

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
a) 12 atoms of carbon (C)
b) 6 atoms of carbon (C)
c) 3 atoms of carbon (C)
d) 2 atoms of carbon (C)

How would smoking tobacco most likely have a negative impact on the ability of an individual to succeed at physical activities?
a) It interferes with balance and coordination
b) It decreases the ability to make decisions rapidly
c) It decreases stamina and cardiovascular efficiency
d) It decreases the speed and power of muscle contractions

Which shows one example of a physical change and one example of a chemical change?
a) boiling water and melting wax
b) rusting iron and baking a cake
c) dissolving powder and shredding paper
d) freezing water and burning coal

How does a balanced chemical equation satisfy the Law of Conservation of Mass?
a) During a chemical reaction, the total amount of matter stays the same.
b) During a chemical reaction, matter is destroyed.
c) During a chemical reaction, one or more new substances are formed.
d) During a chemical reaction, the total number of atoms increases.

Which is a problem with using wind turbines to produce energy?
a) Wind turbines are efficient only in certain areas
b) Wind turbines occupy a small area of land
c) Wind turbines produce a large amount of energy
d) Wind turbines create a large amount of pollution

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