Revision 5

The diagram shows a student’s attempt at drawing a plant cell.

What else should the student have included in the drawing?

• cell wall

• cytoplasm

• nucleus

• vacuole

What are the smaller molecules that make up fats, protein and starch?

• A

• B

• C

• D

Enzymes are ............ that function as biological catalysts.

Which word completes this sentence?

• carbohydrates

• fats

• oils

• proteins

Which effects of magnesium deficiency on a plant are correct?

• A

• B

• C

• D

What should be added to the diet of a person who has too few red blood cells?

• calcium

• iron

• fats

• glucose

Which changes occur in an athlete just before the start of a race?

• A

• B

• C

• D

A meteorite travels through space and becomes closer to the Earth.

What happens to the mass and to the weight of the meteorite?

• A

• B

• C

• D

The diagram shows a sports competition between team X and team Y pulling a rope.

The arrows show the directions of the forces exerted by the teams on the rope.

What is the size of the resultant force on the rope and in which direction does the resultant force

act?

• 75 N to the left

• 75 N to the right

• 725 N to the left

• 725 N to the right

A solid is at a constant temperature.

How can the volume of the solid and the motion of its molecules be described?

• A

• B

• C

• D

A negatively charged sphere is suspended from an insulating thread.

A plastic rod is moved slowly towards the sphere.

The sphere moves away from the rod.

Which statement about the rod is correct?

• It is not charged.

• It is charged but it is not possible to know if it is positive or negative.

• It is negatively charged.

• It is positively charged.