7th Science Data Analysis Skill Practice

Front

Population trend of dragonflies

Back

Increases

Answer explanation

The graph shows a clear upward trend in the population of dragonflies, indicating that the number of dragonflies increases over time. Therefore, the correct statement is that the number of dragonflies increases.

Front

Mosquito population trend

Back

Decreases

Answer explanation

The graph shows a decline in the mosquito population over time, indicating that the number of mosquitoes decreases. Therefore, the correct statement is that the number of mosquitoes decreases.

Front

Best beak adaptation for ladybugs?

Back

Tweezer

Answer explanation

The tweezer beak is best adapted for catching ladybugs due to its precise grip, allowing for effective handling of small, slippery insects. Other beak types lack this level of precision, making them less suitable.

Front

Bird with clothespin beak can eat most:

Back

Beetles

Answer explanation

A bird with a clothespin-like beak is adapted for cracking open hard shells. Among the options, beetles have tough exoskeletons, making them the most suitable food choice for such a beak, allowing the bird to eat them effectively.

Front

Graph matching the table

Back

Front

Dependent Variable in Sports Preference Experiment

Back

Number of students

Answer explanation

The dependent variable (DV) is what is measured in the experiment. In this case, the graph shows the 'Number of students' who like each sport, making it the DV. The other options are not measurements.

Front

Example of a hypothesis

Back

If a plant gets more sunlight, then it will grow taller.

Answer explanation

The correct hypothesis is "If a plant gets more sunlight, then it will grow taller" because it clearly states a cause-and-effect relationship that can be tested through experimentation.

Front

Independent Variable (IV) in car value graph

Back

Year

Answer explanation

The independent variable (IV) is the one that is manipulated or changed in an experiment. In this case, the 'Year' is the IV, as it represents the time over which the car's value is measured.

Front

Common diet of organisms

Back

Both are herbivores

Answer explanation

The correct choice is that they both are herbivores, meaning they primarily consume plants. This commonality indicates that both organisms share a similar dietary preference, focusing on plant-based food sources.

Front

Bison compete with rabbits for food

Back

When bison populations are large

Answer explanation

The correct choice is a. When bison populations are large, they compete with rabbits for food on the preserve. This competition can lead to a decrease in rabbit populations, affecting the overall dynamics of both species.