How do you ensure that your experiment is reliable?
You repeat it several times
100
Name the food making process in green plants
Photosynthesis
100
What type of force are gravity and magnetism
Non contact forces
100
Which planet is closest to the Sun
Mercury
100
What is the symbol for potassium
K
200
In a scientific investigation what is the variable that is changed by the experimenter?
The independent variable
200
What is the function of xylem tissue?
To transport water and mineral salts from the roots to the leaves and other parts of a plant
200
Name 2 forces which are acting on a skateboard rider as she rides down a hill
friction, gravity, driving force, wind resistance
200
Which planet in the solar system has the most moons
Saturn
200
Name the elements present in the compound NaCl
Sodium, chlorine
300
If I predict the outcome of an experiment I am puting forward an ...........
hypothesis
300
Name one structure that a plant cell has that an animal cell never has
A cell wall
300
What is a balanced force, give an example
Forces are balanced when they are equal and opposite so no overall force is acting eg when sitting on a chair the weight force is balanced by the normal reaction
300
If galaxies are so big, explain why only 3 can be seen with the naked eye
They are very far away and so are seen as a star
300
Name the largest naturally occurring element
Uranium
400
Describe an experiment you could perform to show that plants only photosynthesize during the daylight
Keep 2 plants in a dark cupboard, then take one out and place it in sunlight for a few hours. Test both leaves for the presence of starch
400
Describe osmosis and give an example of where it occurs
Osmosis is the passage of water from a dilute to a concentrated solution through a semipermeable membrane. It occurs in the roots of plants when they absorb water from the soil
400
How would you explain your hair standing on end after combing it with a plastic comb?
Electrostatic forces are acting because charge has built up on each hair due to the combing
400
Explain what will happen to our Sun when it has used up all of the hydrogen in its core
It will become a red giant which is much larger than at present and will engulf all of the inner planets including Earth
400
Name six metals
many answers possible
500
Which scientist demonstrated that plants could restore the air by producing oxygen in the 18th century
Joseph Priestly
500
Describe the difference between pollination and fertilisation
Pollination is the transfer of pollen from the anther to the stigma. Fertilisation occurs after this when the nucleus of the pollen grain fuses with the nucleus of the ovule.
500
What is the weight force acting downwards due to a person who weighs 60 kg?
600 Newtons
500
Outline the two factors which determine the brightness of a star
How big it is and how far away it is
500
List 4 observations that could determine that a chemical reaction is taking place
Colour change, formation of a precipitate, change in temerature, gas given off