7th Grade 1st Semester Test Review_2024-25

Front

What causes a population size to decrease?

Back

The number of deaths is greater than the number of births.

Front

What happens to the molecules of a substance when it changes phase from liquid to solid?

Back

The molecules move slower and are more closely packed together.

Front

What is the role of chloroplasts in a cell?

Back

Chloroplasts are the part of a cell where photosynthesis happens.

Front

If the population size stays stable, what does this imply about births and deaths?

Back

Some organisms are born and the same number of organisms die, keeping the total population size constant.

Front

What happens to the molecules of a substance when energy is added and it changes from solid to liquid?

Back

The molecules move faster and overcome some of the attractions between them.

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants use sunlight to synthesize foods with the help of chlorophyll.

Front

What is the difference between a solid, liquid, and gas in terms of molecular movement?

Back

In solids, molecules vibrate in place; in liquids, they move around each other; in gases, they move freely and quickly.

Front

What is the significance of energy transfer in phase changes?

Back

Energy transfer can cause substances to change from one phase to another, affecting molecular movement.

Front

What is the definition of a population in biology?

Back

A population is a group of individuals of the same species living in a specific area.

Front

What is cellular respiration?

Back

Cellular respiration is the process by which cells convert glucose and oxygen into energy, carbon dioxide, and water.