Question

help me guys its urgent​

Answer 1

Answer:

Respiration by living organisms can be investigated by carrying out experiments to show the production of carbon dioxide and heat.

Limewater can be used to detect carbon dioxide.

Answer 2

1. In experiments on respiration, the seeds taken as control are boiled. Why ?

$\boxed{\fcolorbox{red}{pink}{Answer}}$The seeds are boiled with an antiseptic to avoid bacterial decay.

2. What is the use of the following in the

experiments on respiration ? (i) Soda lime (ii) Limewater

$\boxed{\fcolorbox{red}{lime}{Answer}}$In the experiment for respiration in biology , the main aim is to show that plants release carbon dioxide ( CO2 ) while respiring . soda lime absorbs carbon dioxide and turns milky . ... hence we can conclude that carbon dioxide is released when plants respire .

3.Suppose we conduct an experiment to demonstrate respiration in a green plant. What special precaution is required to be taken in it?

$\boxed{\fcolorbox{red}{olive}{Answer}}$TheLight than respiration. Hence the carbon dioxide that is generated by respiration would be used up by photosynthesis making it difficult to detect carbon dioxide.

4. In experiment no. 5, we are using mercury in the test tube and the beaker. Why can't we use water instead?

$\boxed{\fcolorbox{red}{orange}{Answer}}$Mercury is used instead of water because of the following properties of mercury, namely: Mercury is a good conductor of heat and is the only metal that occurs in liquid state. It sticks to the capillary walls and provides accurate results. They can easily be obtained in its pure state.

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