Osmosis Required Practical

Open Ended

How might the mass of plant tissue change when placed in salt solutions of varying concentrations?

Multiple Choice

Why is osmosis important for plant tissues when exposed to different salt solutions?

• It helps plants absorb nutrients from the soil.

• It allows plants to photosynthesize more efficiently.

• It prevents plants from losing water to the environment.

• It enables plants to grow faster.

Multiple Choice

Which piece of equipment is used to measure the mass of the plant matter in this experiment?

• Balance

• Ruler

• Boiling tube

• Paper towel

Multiple Choice

Why is it important to tie back hair and tuck in ties during this experiment?

• To avoid contamination of the experiment

• To prevent accidents involving equipment

• To keep the lab clean

• To improve visibility

Open Ended

Explain why it is important to keep the length of the potato pieces the same in this experiment.

Multiple Select

Which steps in the method ensure that the experiment is a fair test? Select all that apply.

• Cut all pieces into 2cm ensuring they are the same size

• Add 10cm³ of the corresponding salt solution

• Wait for 30 minutes

• Tidy away equipment not in use

Multiple Choice

After removing the potatoes from the boiling tubes, what should you do before recording their mass?

• Wash them with water

• Dab them gently with a paper towel

• Leave them to dry naturally

• Weigh them immediately

Multiple Select

Which piece of equipment is used to cut potato cylinders of the same diameter in the osmosis method?

• Scalpel

• Cork borer

• Ruler

• Top pan balance

Open Ended

Why is it important to trim each potato cylinder to the same length before starting the osmosis experiment?

Multiple Select

Select all the variables that are kept constant in this osmosis experiment.

• Volume of solution in each boiling tube

• Concentration of sucrose solution

• Length of potato cylinders

• Time potato cylinders are left in solution

Multiple Choice

Which measurements must be recorded for each potato cylinder before placing them in the solutions?

• Only the mass

• Only the length

• Both mass and length

• Neither mass nor length

Open Ended

Explain how you would calculate the percentage change in mass for a potato cylinder after the experiment.

Open Ended

Explain why the mass of the potato does not change at a sucrose concentration of 0.3 mol/dm³.

Multiple Choice

At what concentration of sucrose does the mass of the potato not change, according to the graph?

• 0.2 mol/dm³

• 0.4 mol/dm³

• 0.6 mol/dm³

• 0.3 mol/dm³

Multiple Choice

Which of the following are important steps when planning a scientific experiment using the DISCERN method?

• Dependent Variable, Step-by-Step Instructions, Control Variables, Repeat and calculate a mean

• Independent Variable, Control Variables, Equipment, Guess the results

• Step-by-Step Instructions, Use random equipment, Repeat and calculate a mean, Forget units

• Dependent Variable, Ignore instructions, Control Variables, Check numbers only

Open Ended

Describe the sequence of steps you would follow to carry out the osmosis practical using the equipment shown.

Open Ended

Write your own method for the osmosis required practical. (6 marks)

Open Ended

How did this investigation help you understand the process of osmosis in plant tissues?

Multiple Choice

What effect do different salt solutions have on the mass of plant tissue?

• They increase the mass of plant tissue.

• They decrease the mass of plant tissue.

• They have no effect on the mass of plant tissue.

• They can either increase or decrease the mass depending on the concentration.