Given the following hypotheses, underline the experimental (independent) variable.
a) Plant growth is dependent on light.
b) Water is necessary for life.
c) Bacterial infections of the human ear can be cured by antibiotics.
d) The survival rate of baby pigs is increased by warm-water baths.
d) High levels of pesticides in drinking water can reduce egg laying in hens.
e) The number of colds experienced by school children can be reduced if they take vitamins.
f) For maximum growth, orchids require a 25-30% nitrogen concentration in the soil.
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An independent variable does not depend on another variable. The dependent variable is dependent on the independent variable.
For example I'll do the first one for you.
Plant growth is dependent on light.
The growth of the plant depends on how much light the plant gets. The light does not depend on the plants growth. So in this case the plant growth is dependent and the the light is the independent variable