Science cpt

Question 1

Where does the independant variable (time) go on a graph chart?

Answer 1

it goes on the X axis in a horizontical way

Question 2

Where does the dependant variable (stem height) go on a graph chart?

Answer 2

it goes on the Y axis in a vertical way

Question 3

What is a good title for a graph chart?

Answer 3

Change in bean stem height over time

Question 4

what is an independant variable?

Answer 4

what you change/ the substance added to the soil (salt, acid, oil etc…)

Question 5

what is a dependant variable?

Answer 5

depends on the independant variable what you measure, (stem height, number of leaves, leaf colour, etc….)

Question 6

what is the function of a leaf in this experiment?

Answer 6

1. Make food through photosynthesis
2. Absorb sunlight
3. Exchange gases (CO₂ in, O₂ out)
4. Release water through transpiration

Question 7

What is the function of a stem in this experiment?

Answer 7

1. Supports the plant
2. Transports water and minerals from roots to leaves
3. Transports food from leaves to rest of the plant

Question 8

What is the function of the roots in this experiment?

Answer 8

1. Anchor the plant
2. Absorb water and minerals from the soil
3. Store food and nutrients

Question 9

How does the independant variable salt affect the plant?

Answer 9

1. the salt dries out the water so the roots dry out.
2. The leaves turn yellow or brown due to the water shortage
3. Stem: Growth slows weak stem development
4. overall effect is that the plants wilt and may die

Question 10

How does the independant variable Oil affect the plant?

Answer 10

1.it blocks Soil oxygen so roots can’t respire properly
2. Leaves: Wilt due to lack of water
3. Growth slows, nutrients cannot move efficiently
4. Overall effect: Plant may stop growing or die

Question 11

How does the independant variable Acid affect the plant?

Answer 11

Roots: Nutrient absorption blocked damaged root cells
Leaves: Yellowing (chlorosis) from nutrient deficiency
Stem: Stunted growth
Overall effect: Poor overall plant health

Question 12

How can oil enter soil through human activity?

Answer 12

Leaks from vehicles, factories, pipelines
Spills wash into soil and water

Question 13

How can salt enter soil through human activity?

Answer 13

Road salt in winter

Overuse of fertilizers containing salts

Question 14

How can acid enter soil through human activity?

Answer 14

1. Acid rain caused by pollution from factories/cars
2. Industrial waste dumped improperly

Question 15

What is a Control?

Answer 15

A control variable is a factor or element in a scientific experiment that researchers keep constant and unchanged to ensure that only the independent variable affects the dependent variable,

Question 16

why did we use control’s in this experiment?

Answer 16

It shows what happens under normal conditions.

In your bean plant lab, this would be the plant grown with plain water and normal soil.

It allows you to see the effect of the independent variable (like oil, salt, or acid).

It makes the experiment fair and reliable because you know the results are caused by the changes you made, not something else.