Which of these is the best conductor of electricity? (5.5A)

Some beetles break down the remains of dead animals. Some mushrooms break down the remains of dead trees. How do these actions most benefit plants? (5.9A)

Which of these best demonstrates the reflection of light? (5.6C)

Which of these cycles is a direct result of Earth's rotation? (5.8C)

Water flows through turbines in dams like the one shown in the picture. The flowing water makes the turbines spin. What type of energy is used to make the turbines spin in this type of dam? (5.6A)

The graph shows changes in the length of the shadow of a tree during part of a day. If this day continues to be sunny, what will most likely happen to the length of the shadow from 2 pm to 4 pm? (4.8C)

This food web represents organisms in a field. What role do raccoons play in this food web? (5.9B)

The picture shows rock layers next to a road. Layer 3 contains many plant fossils. Layer 3 most likely formed in which of these environments? (5.9D)

A teacher mixes a white powder into a beaker of water. The powder cannot be seen in the water. The teacher then heats the mixture until the water evaporates and the powder can be seen again. Which property of the powder is the teacher demonstrating? (5.5A)

At which stage in the life cycle of a plant are seeds produced? (3.10B)

A student conducts an investigation using four identical cans, each with a hole in the bottom. The student fills each can with a different type of soil and then adds 200 mL of water to each can. The graduated cylinders in the picture show the amount of water that drains through the soil and out the bottom of each can. Some plants have roots that reach deep underground. Which type of soil will most likely stop water from flowing to the deepest roots of these plants? (4.7A)

Fox squirrels live in the trees of city parks throughout Texas. Each spring they build nests of twigs and leaves in the tops of the trees. Fox squirrels are often found near park benches, waiting to be fed by visitors. For fox squirrels, which of these is a learned behavior? (5.10B)

Which of the following events in the water cycle is an example of solar energy being absorbed? (5.8B)

The picture shows a series circuit with three lit bulbs. How many of the bulbs will remain lit if the wire is cut at the point shown by the arrow? (5.6B)

The diagram above shows the sequence of the process that turn solid rock into sandstone. Which two processes best complete this diagram? (5.7A)

Three different objects that use the same source of energy are shown here. What is the energy source for these objects? (5.6A)

A scientist observes sea otters using rocks to break open clamshells. Which of these investigations would best help the scientist determine whether this skill is a learned or an inherited behavior? (5.10B)

Glaciers are masses of ice that move slowly on land. Which of these features was most likely formed by a glacier? (5.7B)

A mixture of beads was placed in a container, as shown belo. The beads are of various sizes, and each one is made of plastic, glass, or steel. The mixture would be easy to separate because all the beads--- (5.5B)

Which two traits best help a cactus conserve water in the dry conditions of a West Texas desert ecosystem? (5.10A)

When light travels through air into a prism, it bends and separates into many colors. In which other situation does light bend? (5.6C)

Some facts about a bird called the painted redstart are listed in the box shown. Which fact best describes one way this bird changes its environment to meet its needs? (5.9A)

A teacher sets up an experiment using five jars. The teacher keeps one jar unwrapped, and the other four jars are wrapped with equal thicknesses of four different materials. Which property of the materials wrapping the jars are the students most likely investigating? (5.5A)

The diets of several types of prairie animals are described in the table. Which of the following prairie food chains is in the correct order? (5.9B)

A diagram of the stages in the water cycle is shown. Which of these observations would most likely be seen at Stage N? (4.8B)

In fall and winter many trees lose their leaves in response to cooler temperatures and---(5.9A)

Scientists use telescopes to make distant objects appear closer. Some parts of a telescope are shown here. Which of the following best describes how the objective lens of this telescope helps a scientist observe the moon? (5.6C)

On which side of a house in Texas should a window be placed so that the people inside the house can see the sunrise each day through the window? (5.8C)

A student reads the label on the bottle of salad dressing shown here. Why would the student shake the salad dressing well before using it? (5.5A)

Which of these changes to the electric circuit shown will cause the lightbulb to light up? (5.6B)

This picture shows a type of plant called kudzu. Kudzu is a fast-growing Asian vine that was introdued into the United States. Kudzu quickly uses available resources and can completely cover the plants in an area. What effect does the rapid growth of kudzu most likely have on an ecosystem? (5.9C)

Which of these best describes climate rather than weather? (5.8A)

Some students put two ice cubes on separate plates. One ice cube had a mass of 80 grams. The other had a mass of 40 grams. Which result would be the same for both ice cubes in this investigation? (3.5C)

Crayfish live in water and often hide under rocks or plants. They come out to look for food and will eat both plants and animals. Which of these is a trait that a crayfish most likely inherits from its parents? (5.10B)

A worker built a sidewalk and pressed some large salt particles into the concrete while it was still wet. When the concrete was dry, the worker washed the sidewalk with water. The picture below shows the sidewalk after it was washed. What most likely happened to the salt? (5.5C)

A student uses a spring scale to pull a 50-gram block horizontally across a wood desk. Then the student pulls the block the same distance across surfaces of carpet, sandpaper, and glass. Which question is this investigation most likely designed to answer? (5.6D)

A string of light with small bubs is shown here. The bulbs are connected by wire that is covered with an insulator. When the lights are on, electricity travels in ----(5.6B)

Eagles catch fish in rivers with their talons. They fly with the fish to a tree branch and tear the fish into small pieces. Which bird most likely catches and eats it food the way an eagle does? (5.10A)