16-17 NCFE

Sally ran a distance of 8 m in 16 s. The graph below shows her motion. Which best describes her motion?

• Her speed was constantly changing.

• Her speed remained constant.

• She stopped moving after four seconds.

• She decreased her speed after four seconds.

How does the energy of a roller-coaster cart change as the cart travels from the top of the roller coaster to the bottom?

• The cart has greater kinetic energy at the top than it does at the bottom.

• The cart has no energy at the top and more energy at the bottom.

• The cart has less potential energy at the top than it does at the bottom.

• The cart has potential energy at the top that is transformed to kinetic energy as it moves to the bottom.

How can simple machines make work easier?

• by decreasing the force needed to complete the task

• by increasing the friction between the machine and the object

• by adding more work on the object than originally applied

• by removing the force of gravity on the object

Why does the troposphere experience the greatest amount of atmospheric pressure compared to the other atmospheric layers?

• It produces the ozone layer.

• It has the highest temperatures.

• It contains a high concentration of gas particles.

• It is the region in which weather occurs.

Which explains why most of the rain that falls comes from the ocean?

• The majority of evaporation takes place over the ocean.

• The majority of precipitation takes place over the ocean.

• Most rivers deposit freshwater into the ocean.

• Most clouds form near or over the ocean.

Barometric pressure has been dropping all day. What weather conditions will most likely occur?

• sunny weather

• stormy weather

• calm weather

• hot weather

A sea breeze blows from the ocean toward the shore. Why does this occur?

• High pressure over the land causes a downdraft to occur.

• The tide carries the wind to the shore as it moves back and forth.

• Conduction of heat from the warm water produces wind from the ocean.

• Air over land heats faster than air over water, which causes convection.

Which two organisms contain chloroplasts and eyespots?

• amoeba and paramecium

• paramecium and volvox

• volvox and euglena

• euglena and amoeba

How do a paramecium and an amoeba obtain food to live?

• A paramecium and an amoeba both use contractile vacuoles to capture food.

• A paramecium and an amoeba both make their own food through photosynthesis.

• A paramecium collects food into an oral groove, while an amoeba uses pseudopods to surround food.

• A paramecium uses pseudopods to capture food, while an amoeba uses chloroplasts to make its food.

Tina observed a cell under a microscope. She concluded that it was a plant cell instead of an animal cell. Which structure helped her come to this conclusion?

• She saw a vacuole, which animal cells lack

• She saw a nucleus, which animal cells lack.

• She saw a chloroplast, which animal cells lack.

• She saw a cell membrane, which animal cells lack.