We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

Respiratory System Investigation Design Lab Essay Sample

  • Pages: 2
  • Word count: 483
  • Rewriting Possibility: 99% (excellent)
  • Category: water

Get Full Essay

Get access to this section to get all help you need with your essay and educational issues.

Get Access

Introduction of TOPIC

Problem: How does the salinity level of water affect the rate of gas exchange for aquatic organisms like algae?



* Mass of algae

* Volume of water

* Room temperature

* Humidity/air pressure


* Rate of gas exchange per minute


* Salinity of the water


– 3 beakers of 100mL in capacity or more

– algae

– graduated cylinder

– distilled water

– table salt

– paper towel

– glass stirring rod

– small fish net

– measuring balance

– large beaker of spring / pond water (to feed algae / keep them alive for further trials)

– respirometer


1. C

reate tables similar to the three shown. 2. Pour distilled water

Sorry, but full essay samples are available only for registered users

Choose a Membership Plan
into the graduated cylinder, measuring out 100mL. Then pour this water into the beaker.

3. Place a piece of paper towel onto of the balance and press the tare button. Then measure out the indicated amount (between 0 – 20g) of table salt.

4. Record the measured mass and then pour the salt into the beaker filled with 100mL of water.

5. Using a stirring rod, stir the water until all of the salt dissolves.


6. Using the small fish net, pace a planarian from the large beaker of spring / pond water into each of the five beakers and wait around 10 minutes.

7. Measure the rate of respiration for the planarian in the beaker with no salt by placing the respirometer into the water close by to the planarian.

8. Remove the respirometer and record the results. Also, record the changes in the appearance and state of the algae if any, in the qualitative chart.

9. Repeat the entire procedure for two more trials.

10. Take the average result of the three trials. Record the averages from each of the groups from the class. Plot the data onto the graph provided in figure 1.

Qualitative Observations

Group’s Qualitative Observations

We can write a custom essay on

Respiratory System Investigation Design Lab Essay ...
According to Your Specific Requirements.

Order an essay

You May Also Find These Documents Helpful

Vitamin C water-soluble

Vitamin C is a water-soluble vitamin that is naturally found in citrus fruits, tomatoes, and leafy green vegetables. It is a well known fact that Vitamin C is extremely vital in the human diet. Vitamin C is known for its numerous health benefits such as prevention against immune system deficiencies, eye diseases, skin wrinkling and much more. It was discovered that scurvy is primarily caused by a deficiency of this vitamin. The needs of Vitamin-C vary per person but the RDA (Recommended Daily Allowance) for Vitamin-C put forward by the Food and Nutrition Board of the National Research Counsel is 60 mg/day for adults and an additional 20 mg/day is recommended for pregnant women. Women who are lactating are strongly advised to take an additional 40 mg/day so that adequate of the vitamin will be present in the breast milk. Due to the unstable nature of ascorbic acid, it oxidizes...

Drainage and Dewatering

In the saturated soil mass, the process of withdrawl of superfluous water from it whether in natural or any artificial form is referred as drainage. Before any kinds of engineering works for example excavation for basement of foundation for any structure or for foundations of dams, mining projects etc., excavations are widely popular below the ground water level. To perform such kinds of excavations, the ground water has to be lowered to the lowest point of excavation in order to obtain workable dry place for the construction work. In this process, drainage is also an essential part of it in order to decrease pore water pressure and minimize the seepage effect which certainly betters the strength and effective strength of it as well as increases safety and formulates stable excavation. So it can be extracted that generally in waterlogged areas, drainage helps for lowering the water table and enables to...

Water molecule structure

The water molecule itself is comprised of a single oxygen atom and two hydrogen atoms. It is the attractions between these atoms however that give water one of its most important features. Whilst covalent bonds do form to keep the three atoms together, their proximity to one another leads to an uneven arrangement of electrons. This leads to the two hydrogen ends becoming slightly positively charged, with the oxygen atom becoming slightly negatively charged. The difference in charge means that water is described as a dipolar molecule. Water’s polarity, when combined with its abundance, means that it is often described as the ‘universal solvent’. With the exception of non-polar molecules, all polar and ionic substances will form weak hydrogen bonds with water molecules, thus forming a solution. This is important as many of the chemical reactions which take place within both plant and animal cells use water as a solvent....

Popular Essays


Emma Taylor


Hi there!
Would you like to get such a paper?
How about getting a customized one?