6th Grade Science
What is the main function of the mitochondria in a cell?
Produce energy for the cell
What is the primary function of red blood cells in the human body?
Carry oxygen
Which scientist is best known for developing the theory of natural selection?
Gregor Mendel
What is the smallest unit of an element that still keeps the properties of that element?
Atom
What causes day and night on Earth?
Earth’s rotation on its axis
During photosynthesis, plants use sunlight, water, and which gas from the air?
Carbon dioxide
Which process allows water to move from plant roots to the leaves?
Transpiration
A trait that is hidden when a dominant allele is present is called:
Recessive
Which subatomic particle has a negative charge?
Electron
Why does Earth experience different seasons during the year?
Earth’s axis is tilted as it revolves around the Sun
Which layer of the Earth is made of solid rock and is broken into tectonic plates?
Crust
What type of rock forms when magma or lava cools and hardens?
Igneous
If a tall pea plant (Tt) is crossed with a short pea plant (tt), what percentage of offspring are expected to be short?
50%
What happens to particles in a solid when heat energy is added?
They move faster
What phase of the Moon occurs when the entire side facing Earth is illuminated?
Full Moon
What usually causes earthquakes?
Movement of tectonic plates
Which statement best describes Newton’s First Law of Motion?
An object in motion stays in motion unless acted on by a force
What is a mutation?
A change in DNA
A molecule is formed when:
Atoms chemically bond together
Ocean tides are mainly caused by the gravitational pull of:
The Moon and the Sun
Which of the following is an example of a physical change?
Melting ice
What is the pH of a neutral substance?
7
Natural selection occurs when:
Organisms with helpful traits survive and reproduce more often
Which state of matter has particles that are tightly packed and vibrate in place?
Solid
Which season occurs in the Northern Hemisphere when it is tilted toward the Sun?
Summer