Coordinated science multiple choice

Which is a characteristic of all living things?

• a heart

• breathing

• excretion

• sexual reproduction

The graph shows the rate of reaction of salivary amylase at different temperatures.

What does the graph show at point X?

• The enzyme has stopped working.

• The reaction is nearly completed.

• The reaction rate is controlled by pH.

• The temperature is higher than the optimum.

Four test-tubes were set up as shown in the diagram. Which test-tube will contain the most dissolved oxygen after 24 hours?

• A

• B

• C

• D

Water is taken in through the roots and lost from the leaves of tall trees. What enables this to happen?

• active transport by the xylem vessels

• pressure from the roots

• translocation in the phloem

• transpiration loss from the leaves

The diagram shows a section through a red blood cell.

How is the structure of the cell related to its function?

• The cell has no nucleus to use up oxygen.

• The cell membrane has a small surface area in relation to volume

• The cytoplasm contains haemoglobin.

• The flat structure makes it easier to be carried through arteries.

Which word equation for anaerobic respiration in yeast is correct?

• glucose → carbon dioxide + alcohol

• glucose → carbon dioxide + water

• glucose → lactic acid + alcohol

• glucose → lactic acid + water

The graph shows the diameter of the pupil in an eye at different times.

What is the eye doing at times X and Y?

• X: focusing on a distant object

  Y: focusing on a nearby object

• X: focusing on a nearby object

  Y: focusing on a distant object

• X: looking at a bright light

  Y: looking at a dim light

• X: looking at a dim light

  Y: looking at a bright light

To which environmental stimulus is a plant root responding when it grows downwards?

• a decrease in soil water content

• light falling on the leaves of the plant

• rising temperature

• the force of gravity

What is an advantage of asexual reproduction compared with sexual reproduction?

• A specific disease is less likely to spread throughout the whole population.

• It increases variation in the offspring.

• It produces offspring more rapidly.

• It requires two parents.

Kangaroos have 16 chromosomes in their skin cells. How many chromosomes are there in a kangaroo sperm cell?

• 4

• 8

• 16

• 32