Source: Maths & Science Guide
- How do you separate blood into plasma and its cells?
- Two types of land snails with brown and green shell colours are studied on a grassland habitat covered with dead woods, twigs and fallen leaves. State why quadrat sampling is inappropriate in the above investigation.
- Name the substrate on which the enzyme lipase acts.
- By centrifuging at high speed for a few minutes, the blood can be separated into plasma and its cells.
- Quadrat sampling is time consuming and tedious to carry out.
- A sampling method is chosen based on the animal studied. The student should have made some reference to the land snails.
- Fats are a smaller group of a larger family of lipids. Lipids include triglycerides (fats and oils), phospholipids and steroids.
- By centrifuging blood at high speed for a few minutes. Subsequently, it separetes into two layers - the plasma layer on top and the cells at the bottom.
- Since land snails are mobile organisms, they can move out of the quadrats. Hence, findings based on this technique will not be reliable.