Biology Practicals Class 12

Study of Water Turbidity, pH and Microbial Presence

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About Simulation

  • In this biology experiment, learners will study how to measure water's relative clarity, i.e., water turbidity.
  • This simulation will help learners to understand how to measure the pH value of water samples using pH strips and indicator dye methods.
  • The experiment allows the user to examine and identify different microscopic organisms under the microscope.
  • This simulation allows users to get acquainted with the instruments, such as Secchi’s disc, used while performing experiments on the field outside the lab.
  • This biology experiment allows users to distinguish between microbes, phytoplanktons, and zooplanktons - different organisms present in the water bodies.

Physical properties of water

  • Learners will understand about water quality analysis using this experiment.

Simulation Details

Duration – 30 Minutes
Easily Accessible
Language – English
Platforms – Android & Windows


Water is an abiotic component essential for all living organisms for sustenance. Majority of Earth’s surface, i.e. 70.9% is covered with water – mostly seas and oceans.

The measurement of relative clarity of the liquid is known as turbidity. Water turbidity is an optical characteristic of water. It measures the amount of light scattered on the water surface or water sample after light penetration. The water turbidity helps in the qualitative analysis of water.

The pH measures the acidity or basicity (alkalinity) of any compound. The water pH is neutral i.e., 7 at 25 degrees Celsius. Generally, the water pH for normal activities ranges from 6.5 to 8.5.

Physical properties of water, such as temperature, pH, turbidity, colour, odour, and viscosity, determine the type of flora and fauna present in the water. Different kinds of organism are present in water bodies, some of which are microscopic while others are visible to the naked eye.

The presence of microbes depends upon the water’s multiple physical properties and helps determine the water quality.

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Requirements for this Science Experiment

Secchi’s Disc Pins Universal Indicator Solution Dropper pH Paper Tile Test tube Slides Coverslips Needle Filter paper Water samples

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