# Grade 8 Science: Final Comprehensive

## Quiz by Jessica McAndrews

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45 questions
• Q1

Which correctly represents the relationship between the nucleus, DNA, genes, and chromosomes?

The nucleus contains DNA strands, which are condensed chromosomes containing many genes.

The nucleus contains chromosomes, which are condensed genes containing many DNA.

The nucleus contains chromosomes, which are condensed DNA containing many genes.

The nucleus contains genes, which are condensed DNA containing many chromosomes.

60s
• Q2

A building contractor wants to include a custom-shaped lightning rod on a new building. A lightning rod is a metallic rod placed on the roof of a building with a wire that is connected to the ground. When lightning strikes the rod, the electricity is directed to the ground instead of to the building. To test the design, the contractor first sends a survey to the future residents of the building to determine which shape is liked the most. Then the contractor tests the different-shaped rods with a lightning simulator. The table shows the lightning rods and the results.

Click on the image to view the table.

Which lightning rod would be best for the building?

The line-shaped lightning rod; it attracts the largest number of lightning strikes.

The heart-shaped lightning rod; it needs the shortest wire to connect to the ground.

The triangle-shaped lightning rod; it is easy to see.

The dog-shaped lightning rod; it has the most popular shape.

60s
• Q3

A student designs a model for heating water with the Sun. See image. The model is made using black cardboard with holes through which ties attach a tube, as shown.

The student adds water to the tube and places the model facing the Sun. The student drains the water from the model into a beaker after 10 minutes. The student wants to create new models, changing the design to increase the temperature of the water being heated by the Sun.

How can the student best compare the models?

Measure the temperature of the water before and after heating in all the models.

Measure the temperature of the cardboard before and after heating in all the models.

Measure the temperature of the cardboard after heating in all the models.

Measure the temperature of the water before heating in all the models.

60s
• Q4

The diagram shows the cycling of matter in the interior of Earth. See image.

Which statement correctly explains the cycling of matter in the interior of Earth?

The heat from Earth’s core causes material in the area under the crust to become more dense and rise, while less dense material sinks.

The heat from Earth’s core causes material in the area under the crust to become less dense and sink, while more dense material rises.

The heat from Earth’s core causes material in the area under the crust to become more dense and sink, while less dense material rises.

The heat from Earth’s core causes material in the area under the crust to become less dense and rise, while more dense material sinks.

60s
• Q5

The table shows the speeds of sound waves and light waves through different media. See image.

Which statement explains the behaviors of the two waves in different media?

Sound waves travel the fastest through a solid, while light waves cannot travel through a solid.

Sound waves cannot travel through a vacuum, while light waves travel the fastest through a vacuum.

Sound waves cannot travel through a liquid, while light waves travel the fastest through a liquid.

Sound waves travel the fastest through a vacuum, while light waves travel the fastest through a liquid.

60s
• Q6

The model shows the production of traits from DNA. See image.

Which statement describes the relationship between the DNA regions, proteins, and traits?

The regions are identical proteins that code for the same gene, which produces different traits.

The regions are different genes that code for the same protein, which produces identical traits.

The regions are identical proteins that code for different genes, which produce identical traits.

The regions are different genes that code for different proteins, which produce different traits.

60s
• Q7

The model represents the process of reproduction in an amoeba. See image.

Which answer the ways of this method of reproduction?

produces many offspring and produces offspring faster

requires time to find a mate and produces high genetic diversity

produces high genetic diversity and requires a large amount of energy

60s
• Q8

A group of researchers studied the probability of earthquakes in a large area of land. Each researcher laid out a different plan, as shown in the table. See image.

Which explains why a researcher’s plan will work best for predicting the probability of earthquakes in the area?

Researcher B’s plan provides data after an earthquake has already happened.

Researcher D’s plan uses satellite imagery to determine risk factors.

Researcher C’s plan models the ground and buildup of stress that cannot be easily seen.

Researcher A’s plan relies on native wildlife already living in the area.

60s
• Q9

The chart shows a population of penguin breeding pairs and the largest change from average temperature for a 20-year span in the Antarctic. See image.

What is the relationship between the number of penguin breeding pairs and the changing temperature?

Increasing temperatures decreased the number of penguin breeding pairs.

Decreasing temperatures decreased the number of penguin breeding pairs.

Decreasing temperatures had no effect on the number of penguin breeding pairs.

Increasing temperatures had no effect on the number of penguin breeding pairs.

60s
• Q10

The diagram shows the fossil record of horse feet and an estimation of the size of the full organism. See image.

Which statement best summarizes the diagram?

Horses have existed on Earth for 30 million years, and their size has decreased over time.

Horses have existed on Earth for only 15 million years, and their size has increased over time.

Horses have existed on Earth for 40 million years, and their size has increased over time.

Horses have existed on Earth for only 10 million years, and their size has decreased over time.

60s
• Q11

Researchers collect data of plant and animal fossil records from the Permian Period (299-252 million years ago) in Antarctica. The researchers use the data to interpret what the climate was like in Antarctica during the Permian Period. They compare the data with conditions in modern-day Antarctica. See image.

Which uses information from the table to explain the difference in plants and animals in Antarctica between the Permian Period and modern day?

Falling meteors wiped out all subtropical life in Antarctica.

Decreasing temperatures caused the extinction of all subtropical species.

Changing sea levels provided Antarctica’s forests more water.

Mass extinctions buried all subtropical species under the soil.

60s
• Q12

The diagram compares the embryos of a bird and a human. See image.

Which explains the gill slits and tails in both the bird and human?

Gill slits and tails are analogous structures; birds and humans belong to the same geographical area.

Gill slits and tails are homologous structures; birds and humans originated in the same era.

Gill slits and tails are analogous structures; birds and humans evolved independently to survive in different conditions.

Gill slits and tails are homologous structures; birds and humans share a common ancestry.

60s
• Q13

Humans depend on coal mining to meet energy demands. Polluted water from a coal mine site flows to a nearby lake. This causes a decrease in aquatic life by killing the fish and other water organisms, including plants.

Which way best manages the polluted water while maintaining the biodiversity of the ecosystem?

Pump the polluted water deep into the ground through a pipe.

Treat the polluted water, and filter it before releasing it into the lake.

Store the polluted water for industrial uses before releasing it into the lake.

Use the polluted water to irrigate crops.

60s
• Q14

The model shows the effect of birds feeding on a caterpillar population. See image.

Which explains the caterpillar population in generation 3?

The population of non-hairy caterpillars is greater because birds select more non-hairy caterpillars than hairy caterpillars to eat.

The population of hairy caterpillars is greater because birds select more hairy caterpillars than non-hairy caterpillars to eat.

The population of hairy caterpillars is greater because birds select more non-hairy caterpillars than hairy caterpillars to eat.

The population of non-hairy caterpillars is greater because birds select more hairy caterpillars than non-hairy caterpillars to eat.

60s
• Q15

The model shows the cross between two strains of corn. See image.

A student observes that some of the offspring are different from the parent plant. What is the likely reason for the observation?

genetic variation due to asexual reproduction

genetic similarity due to sexual reproduction

genetic similarity due to asexual reproduction

genetic variation due to sexual reproduction

60s

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