Which factors help a seed to germinate?
warmth, air, water
warmth, water, light
warmth, air, light
Which of the following best describes the process of evaporation?
The particles lose energy and move closer to each other.
The particles lose energy and move away from each other.
The particles gain energy and move closer to each other.
The particles gain energy and move away from each other.
_________________ is the liquid that is used to dissolve a solute in a solution.
Solvent
Which variable is kept the same throughout the investigation?
control variable
dependent variable
independent variable
_________________ are solids that cannot dissolve in a liquid.
Insoluble
Which variable is the one condition that is changed during a scientific experiment?
dependent variable
independent variable
control variable
The term ________________ is used to describe what happens to the soluble solids that melt in the mixture.
Dissolve
Why is a loosened string of a guitar producing a low note?
Because when the string is loosened, the sound VIBRATIONS MOVE SLOWER making a high sound.
The layer air that surrounds the earth is called _________________.
atmosphere
Which of the following best describes the process of condensation?
The particles gain energy and move away from each other.
The particles lose energy and move away from each other.
The particles lose energy and move closer to each other.
The particles gain energy and move closer to each other.
This describes how loud or quiet a sound is.
Volume
__________________is when pollen lands onto the stigma of another flower.
Pollination
This describes how high or low a sound is.
Pitch
How can you make a recorder produce low notes?
You must cover more holes on the recorder.
Why is a tightened string of a guitar producing a high note?
Because when the string is tightened, the sound VIBRATIONS MOVE FASTER making a high sound.
_________________ is the solid that dissolves in the solvent in a solution.
Solute
How can you make a recorder produce high notes?
You must cover less holes in the recorder.
__________________when the pollen joins with egg inside the ovary.
Fertilisation
This is a backwards and forwards movement.
vibrations
pitch
volume
When a seed starts to grow, the process is called______________.
germination
__________________when plants needs to spread seeds away from themselves.
Seed dispersal
Which variable is the one condition that is observed or measured during a scientific experiment?
independent variable
control variable
dependent variable
_________________ are solids that can dissolve in a liquid.
Soluble