0654_2017_O/N_QP_11_Biology

1.A child blows into a rubber balloon.

What is the percentage of oxygen inside the balloon?

• 0%

• 4%

• 16%

• 21%

2.A seedling is placed with its root horizontal to the ground. Three days later, the root is longer and curves towards the earth.

Which characteristics of living things does this show?

• growth, nutrition and movement

• growth, sensitivity and movement

• movement, nutrition and respiration

• nutrition, sensitivity and respiration

3.What is homeostasis?

• the maintenance of the body’s external environment

• the maintenance of the body’s internal environment

• the processes that produce heat in the body

• the removal of wastes from the body

4.The diagram shows a reflex arc.

If the neurone at R is stimulated, what effect does this have on the neurones at P and Q?

• effect on P-no effect, effect on Q-no effect

• effect on P-no effect, effect on Q-stimulated

• effect on P-stimulated, effect on Q-no effect

• effect on P-stimulated, effect on Q-stimulated

5.The diagram shows parts of a mesophyll cell.

What is found in the part labelled X?

• chloroplasts and nucleus

• chloroplasts only

• nucleus only

• watery solution

6.A human baby develops inside its mother attached to the wall of her uterus by the placenta and umbilical cord.

Which structure becomes embedded in the uterus wall to establish this connection?

• a ball of cells grown from the zygote

• a sperm

• the unfertilised egg

• the zygote

7.Water enters root hair cells from the soil.

What happens to most of this water after it has entered the cells?

• It is used in photosynthesis in the root cells.

• It moves out again when the soil is dry.

• It moves to the leaves and is lost by transpiration.

• The cell uses it in respiration.

8.Food tests are performed on four substances.

Which substance contains fat and protein?

• A

• B

• C

• D

9.The graph shows the effect of temperature on the activity of a mammalian enzyme.

Which conclusion can be drawn from the graph?

• The activity increases in a linear manner up to 35 °C.

• The activity is four times greater at 40 °C than at 20 °C.

• The enzyme has a higher activity at 60 °C than at 0 °C.

• The optimum temperature for this enzyme is 37 °C.

10.What is the main result of natural selection?

• fewer genes being passed on to offspring

• higher-yielding food crops

• organisms better adapted to the environment

• sheep that produce better quality wool