1.
Which of the following items is necessary in a laboratory for safety purposes?
Correct Answer
D. Fire extinguisher
Explanation
A fire extinguisher is necessary in a laboratory for safety purposes because it can be used to quickly and effectively extinguish small fires. In a laboratory setting, there is always a risk of fire due to the presence of flammable materials and chemicals. Having a fire extinguisher readily available allows for immediate action to be taken in case of a fire emergency, helping to prevent the spread of fire and protect the safety of individuals in the lab.
2.
The brown fur of the arctic hare turns white in winter. How does this color change most likely help the arctic hare?
Correct Answer
B. It helps the animal hide from predators.
Explanation
The brown fur of the arctic hare turning white in winter helps the animal hide from predators. This color change allows the hare to blend in with its snowy surroundings, making it harder for predators to spot and catch it. By camouflaging itself, the arctic hare increases its chances of survival and avoids becoming prey.
3.
A student plays the cymbals in a band. When the cymbals are hit together, a loud sound is produced. The force of the cymbals hitting each other produces sound because —
Correct Answer
D. Air vibrates
Explanation
When the cymbals are hit together, the force causes them to vibrate. These vibrations then travel through the air as sound waves, which our ears perceive as sound. Therefore, the correct answer is that air vibrates.
4.
Ice cream in a bowl changed from solid to liquid in a few minutes. Which of the following most likely caused this change?
Correct Answer
B. Heat was added to the ice cream.
Explanation
The most likely cause for the ice cream changing from solid to liquid in a few minutes is the addition of heat. Heat causes the ice cream to melt and transition from a solid to a liquid state. Bacteria growing in the ice cream would not cause it to change from solid to liquid. Water evaporating from the ice cream would cause it to lose moisture, but not necessarily change its state from solid to liquid. Therefore, the addition of heat is the most plausible explanation for the observed change.
5.
The picture shows a type of gazelle that lives in Africa. It eats leaves, twigs, flowers, and fruits. Which characteristic most helps this gazelle get food?
Correct Answer
A. Long neck
Explanation
The long neck of the gazelle helps it reach leaves, twigs, flowers, and fruits that are high up in trees or bushes. This characteristic allows the gazelle to access a wider range of food sources compared to other animals with shorter necks.
6.
The picture shows an empty cicada shell and a cicada. The cicada shell most likely shows that —
Correct Answer
C. Cicadas shed their skin during their life cycle
Explanation
The correct answer is "cicadas shed their skin during their life cycle". This is because the picture shows an empty cicada shell, which indicates that the cicada has molted and shed its old exoskeleton. Cicadas undergo incomplete metamorphosis, where they go through several molting stages before reaching adulthood. During each molt, they shed their outer skin, leaving behind an empty shell. This process is necessary for their growth and development.
7.
A fork falls off the edge of a table. Which force moves the fork toward the floor?
Correct Answer
A. The pull of Earth’s gravity
Explanation
The force that moves the fork toward the floor is the pull of Earth's gravity. Gravity is the force that attracts objects towards the center of the Earth, causing them to fall. In this case, the fork falls off the edge of the table because the force of gravity is pulling it downward. The other options, such as the pull of Earth's rotation, the push of the table, and the push of air pressure, do not play a significant role in moving the fork toward the floor in this scenario.
8.
Which picture shows the stage at which the monarch butterfly helps the milkweed plant reproduce?
Correct Answer
D. T
Explanation
Picture T shows the stage at which the monarch butterfly helps the milkweed plant reproduce. This is because monarch butterflies are known to be pollinators of milkweed plants. They transfer pollen from one milkweed flower to another, aiding in the plant's reproduction process.
9.
On a recent field trip, students found a 20-centimeter-long salamander. The salamander had four toes on its front feet and five toes on its back feet. According to the table above, the students most likely found which type of salamander?
Correct Answer
C. Spotted salamander
Explanation
Based on the information provided, the students most likely found a spotted salamander. This is because spotted salamanders are known to have four toes on their front feet and five toes on their back feet, which matches the description given. The other options listed in the question do not have the same toe configuration, making them less likely to be the correct answer.
10.
One example of a trait passed from a parent plant to its offspring is —
Correct Answer
C. The color of the flowers on the plant
Explanation
The color of the flowers on the plant is an example of a trait passed from a parent plant to its offspring. This is because the color of the flowers is determined by the genetic information inherited from the parent plant. Different genes control the production of pigments that give flowers their color, and these genes are passed down from one generation to the next. Therefore, offspring plants will often have similar flower colors to their parent plants.
11.
Some students measured the growth of four tomato plants after one month. The plants grew in identical containers with different soils. The students made a table of their data, as shown above. What is the best title for the second column in their table?
Correct Answer
A. Plant Height (cm)
Explanation
The best title for the second column in their table would be "Days of Growth." This is because the second column represents the time period in which the students measured the growth of the tomato plants.
12.
The picture shows the label for a new product. Based on the label, the reader can conclude that the tablets ______
Correct Answer
A. Were made for children
Explanation
The reader can conclude that the tablets were made for children because the label uses bright colors and playful fonts, which are often associated with products targeted towards children. Additionally, the label includes a cartoon character, further indicating that the tablets are intended for a younger audience.
13.
When a dog sees a cat, a message travels from the dog’s eyes to the dog’s _____
Correct Answer
A. Brain
Explanation
When a dog sees a cat, the visual information is processed by the dog's eyes and then transmitted to the dog's brain. The brain is responsible for interpreting the visual input and generating appropriate responses or behaviors. Therefore, it is the correct answer as it accurately describes the pathway of information processing in the dog's body.
14.
Which of these mixtures would be easiest to separate?
Correct Answer
A. Fruit salad
Explanation
Fruit salad would be easiest to separate compared to the other options. This is because fruit salad is a mixture of different fruits, which can be easily separated by hand or using utensils. On the other hand, powdered lemonade, hot chocolate, and instant pudding are all mixtures in which the ingredients are in a powdered or solid form that is mixed with a liquid. These mixtures would require more effort and specific methods, such as stirring, dissolving, or heating, to separate the components.