2021 Sci OST Questions

Which statement describes one way that bees interact with flowers?

• Flowers make seeds that bees can use for energy.

• Bees produce honey that flowers can use for energy.

• Flowers provide bees with places to hide from predators.

• Bees help flowers reproduce by carrying pollen to other flowers.

Tags

NGSS.MS-LS2-2

Two students use a ball and a flashlight to represent Earth and the sun. Which statement explains why point X should be the North Pole instead of point Y?

• Earth’s axis is tilted.

• Earth orbits the moon.

• Earth rotates on its axis.

• Earth is pulled by the moon.

Tags

NGSS.MS-ESS1-1

A student pushed a cart in a straight line for three trials. In the first trial she applied a small force to the cart. In the second trial she applied a medium force, and in the third trial she applied a large force. She observed the relationship between the force she applied and the change in speed of the cart. Which bar graph shows the relationship between the force applied to the cart and the change in speed in the student’s three trials?

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Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

Set up an experiment to test how light can heat objects. A hypothesis to test has been selected. Which set up for the experiment tests this hypothesis and shows the correct results?

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Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A scientist studies an object that is in outer space and is made of ice and gas. It has a very large orbit around the sun. When it gets closer to the sun, the ice melts and the gases burn. Which type of celestial body is he studying?

• asteroid

• comet

• meteoroid

• moon

A student looks at stars through a telescope. Each star is the same size as the sun. Which star is farthest from Earth?

• The largest circle represents the star farthest from Earth.

• The smallest circle represents the star farthest from Earth.

• The middle circle represents the star farthest from Earth.

• There is not enough information to know which star is farthest from Earth.

Tags

NGSS.MS-ESS1-3

Students in a fifth grade class want to set up an aquarium that is like a natural lake environment. They want the aquarium to run on its own without cleaning, feeding, filters, or air pumps. To do this, the aquarium must contain organisms to fill all the roles in a complete food chain. Which aquarium design shows the organisms that fill all the roles in a complete food chain?

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Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Scientists study hippopotamuses (hippos), ticks, and carp (a species of fish) living in a river ecosystem. The hippos eat grasses, the ticks live on the skin of the hippos and feed on their blood, and the carp eat the ticks and algae. While studying the ecosystem, the scientists notice that the number of carp in the river has increased.

Part A: Which describes the change in the number of ticks due to the increase in carp?

• The tick population will increase.

• The tick population will decrease.

• The tick population will remain steady.

Tags

NGSS.MS-LS2-2

Scientists study hippopotamuses (hippos), ticks, and carp (a species of fish) living in a river ecosystem. The hippos eat grasses, the ticks live on the skin of the hippos and feed on their blood, and the carp eat the ticks and algae. While studying the ecosystem, the scientists notice that the number of carp in the river has increased.

Part B: Select each organism on the food web that is part of a mutualistic relationship in the river ecosystem.

• Algae

• Carp

• Ticks

• Hippos

• Aquatic Grasses

Tags

NGSS.MS-LS2-2

Two identical wagons, A and B, are next to each other on a flat surface. The wagons are not moving and are not touching. The student wants Wagon A to have a greater increase in its speed than Wagon B when an equal force is applied to both wagons. What could the student do to one of the wagons to achieve this result?

• Put a bag filled with books in Wagon A only.

• Put a bag filled with books in Wagon B only.

• Push Wagon A towards the right instead of straight.

• Push Wagon A towards the left and push Wagon B towards the right.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2