Question

study the given water sample and observe the presence of living organisms in the given sample

Answer 1

Answer:

To study the presence of living organisms

Add the collected water sample, preferably from a pond, into the test tube. Leave the sample undisturbed, until the sediment settles at the bottom of the test tube. Transfer a drop from the test tube on to a glass slide. Gently place a coverslip on the slide using a needle.

Answer 2

Carbon dioxide gas as a waste product when living organisms breathe out.

Carbon dioxide:

• Carbon dioxide gas can be identified bromothymol blue solution is comes out using through carbon dioxide indicator in that time.
• In deciduous forest four different levels of soil has been taken to find out if there are living organisms is present.
• Four different levels of soil taken from the deciduous forest to find out if there are living organisms is present.
• There are two types of water sampling strategies namely regarding the time frame when the samples are collected namely:
• Discrete samples and
• Composite samples.