Science #8

Many people ride a bicycle for fun and exercise. Some people ride a bicycle to work because it saves money and benefits the environment by reducing the use of fossil fuels.

Which of these is not an example of the bicycle using mechanical energy?

• The pedals, gears, and chain help turn the wheels.

• The wheels turn when the bicycle moves.

• The front wheel guides the bicycle as it moves.

• The reflector allows the bicycle to be seen at night.

A farmer keeps bees to pollinate crops. The farmer makes several observations about the bees.

Which of these observations describes a learned behavior?

• Bees make return trips to drink sugar water from a bowl placed 40 meters from their hive.

• Bees have dark eyes and black-and-yellow stripes.

• Bees produce honey from the nectar they collect.

• Bees will sting when threatened or disturbed.

A group of students built the circuit shown below.

The lightbulb does not glow. Which statement explains this observation?

• The battery is not charged.

• The lightbulb is not part of a complete circuit.

• The circuit does not have a switch.

• The bell uses most of the energy from the battery.

Tags

NGSS.4-PS3-2

The whiskers of a river otter and the antennae of a cockroach are shown below.

How do structures such as whiskers and antennae benefit organisms?

• They help the organisms detect their surroundings.

• They help the organisms eat food quickly.

• They help the organisms fight predators.

• None of these

An energy company wants to build a hydroelectric power plant. Which of these characteristics of an area is most important to the development of a hydroelectric power plant?

• The area has a cool, rainy climate.

• The area is located in a valley with very little wind and frequent heavy fog.

• The area has a river that flows rapidly from nearby mountains through a valley.

• The area has no geysers or hot springs.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

A student observed liquid wax dripping down the side of a burning candle. After putting out the candle’s flame, the student left the room. Several hours later the student observed that there was no longer any liquid on the side of the candle. Which statement explains what most likely happened to the liquid wax?

• The heat given off by the flame caused the candle wax to evaporate.

• The liquid wax changed back into a solid as it cooled.

• The liquid wax condensed and was absorbed by the candle.

• None of the above

Tags

NGSS.MS-PS1-4

Which statement best describes the relationship between humans and plants in the carbon dioxide–oxygen cycle?

• Humans depend on oxygen released into the air by plants, and plants depend on carbon dioxide that humans release into the air.

• Plants produce carbon dioxide as a product of photosynthesis and release it into the air to provide energy for humans.

• Plants depend primarily on energy supplied by oxygen for photosynthesis, a process which releases carbon dioxide needed by humans.

• Humans and plants use gases in the air and the energy of sunlight to produce their own food.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

A student adds 10 grams of four different powdered solids into four different beakers. The student then adds 100 mL of water to each beaker, stirs the mixtures, and allows them to sit for half an hour before recording observations. Which question is the student most likely trying to answer with this investigation?

• At what water temperature do the substances dissolve?

• How much water is needed to cause a substance to change state?

• What causes a substance to sink when put in water?

• Which substances dissolve in water?

A freshwater ecosystem has various food webs. One of these food webs is shown below.

Which organisms transfer the most energy within the food web?

• Bass, because they are predators in this web

• Copepods, because they support two chains in this web

• Crayfish, because they are at the bottom of this web

• Algae, because they are the producers in this web

Tags

NGSS.MS-LS2-3

What is Mrs. Stewarts favorite drink is ​ (a)   .

• coffee
• sweet tea
• gatorade
• water