Take this Quiz: GED and HiSET Science — experiments, results and content | Zestly

Question 1

A gardener wants to know if a specific liquid fertiliser makes tomato plants grow taller. She plants ten identical tomato seedlings in identical pots with the same soil. She gives five plants the fertiliser once a week and gives the other five plants only plain water. After four weeks, she measures the height of all plants. What is the independent variable in this experiment?

Accepted Answer

The type of liquid added to the soil

Answer

The height of the tomato plants

Answer

The amount of sunlight the plants receive

Answer

The type of soil used in the pots

Question 2

A delivery driver notices that his van uses more fuel when driving on hilly routes compared to flat routes. He wants to test the hypothesis that steeper road inclines increase fuel consumption. Which experiment would best test this hypothesis?

Accepted Answer

Drive the same van at a constant speed on roads with different measured inclines

Answer

Drive the same route at different times of the day to see if traffic affects fuel use

Answer

Compare fuel use of two different van models on the same flat road

Answer

Record the fuel use of ten different drivers on the same hilly route

Question 3

A haulage firm wants to know whether a new brand of engine oil reduces fuel use. It puts the new oil in its ten newest lorries and leaves the old oil in its ten oldest. Over the following month the ten newer lorries use 6 per cent less fuel per mile than the ten older ones. What does this result establish?

Accepted Answer

Very little, because the oil was not the only difference between the two groups — the lorries also differed in age.

Answer

That the new oil reduces fuel use by about 6 per cent.

Answer

That the age of a lorry makes no difference to fuel use.

Answer

That the new oil would reduce fuel use in cars as well as in lorries.

Question 4

A cafe records its customers and its coffee sales for five days: Monday 20 customers and 30 coffees, Tuesday 25 and 35, Wednesday 15 and 20, Thursday 30 and 45, Friday 40 and 60. Which statement do these figures support?

Answer

Coffee sales were highest on Friday because the staff worked faster that day.

Answer

On every day recorded, the number of coffees sold rose and fell together with the number of customers.

Answer

The cafe made more profit on Friday than on any other day that week.

Answer

Customers drank more coffee in the mornings than in the afternoons.

Question 5

Which part of a human body cell carries out the process that releases energy from nutrients?

Answer

The nucleus

Answer

The cell membrane

Answer

The mitochondria

Answer

The ribosome