The type of soil and the amount of light that the plant is getting should be kept constant.
What are the requirements for plant growth?
Plants are autotrophic organisms, this means that they are able to synthesize their own food as organic matter by obtaining inorganic matter from their surroundings. The food helps in the growth of the plants.
The inorganic matter used by the plants for the synthesis of their food is water and carbon dioxide. Plants obtain water from the soil and carbon dioxide from the atmosphere.
The water is absorbed by the roots of the plant from the soil. The moisture content of different types of soils can vary depending on location, humidity, weather or climate conditions, etc. Also, plants obtain nutrients from the soil which can also vary depending on the kind of soil.
The carbon dioxide obtained from the atmosphere is absorbed by the stomata present in the leaves of the plants.
Plants require light energy to produce their organic matter which is absorbed by the chlorophyll present in the leaves.
Therefore, to test whether the amount of water has any effect on the growth of the plants, the amount of light and the type of soil should be kept constant.
Read more about plant growth, here
https://brainly.com/question/9323511
#SPJ2
