Science
Science
Planets
Planets
Either/or
100

This organelle is known as the powerhouse of the cell

What is the mitochondrion?

100

This scale, running from 0 to 14, measures how acidic or basic a substance is.

What is the pH scale?

100

This planet is the closest to the Sun and experiences extreme temperature swings between day and night.

Mercury.

100

This planet is the only known world in our solar system capable of supporting life

Earth.

100

This large organ produces bile, which helps digest fats.

Liver.

200

This process is how plant cells make their own food using sunlight

What is photosynthesis?

200

This strong muscle pumps blood through four chambers inside your chest.

Heart.

200

Because of its thick atmosphere of carbon dioxide, this planet is the hottest in our solar system.

Venus.

200

This deep blue planet is the farthest major planet from the Sun

Neptune.

200

This long organ is where most chemical digestion and nutrient absorption take place.

Large intestine. 

300

This type of cell division results in two identical daughter cells.

What is mitosis?

300

This force holds the planets in their stable orbits around the Sun.

Gravity.

300

In 2006, the International Astronomical Union reclassified this former ninth planet as a dwarf planet.

Pluto.

300

Iron oxide, or rust, on its surface gives this planet its distinct reddish colour

Mars.

300

This hormone is released by the pancreas to lower glucose levels in the bloodstream.

Insulin.

400

This cell structure acts like a gatekeeper, controlling exactly what enters and leaves the cell.

Membrane.

400

These specific blood vessels always carry blood away from the heart

What are arteries?

400

This term describes the time it takes for a planet to make one full trip around the Sun.

All accepted: Year, revolution period, or orbital period.
400

This gas giant is famous for its massive, complex, and highly visible ring system.

Saturn.

400

This gas makes up the majority of Earth's atmosphere

What is nitrogen?

500

This system in the human body includes the heart, blood, and blood vessels.

What is the circulatory system?

500

This flexible connective tissue acts as a cushion between bones to prevent them from rubbing together.

What is cartilage? 

500

This massive planet contains a famous storm called the Great Red Spot.

Jupiter.

500

This ice giant is unique because it rotates on its side, nearly parallel to its orbital plane.

Uranus.

500

This is the only planet in our solar system whose existence was mathematically calculated and predicted before it was actually seen through a telescope.

What is neptune?