Questions and Answers

Investigate and explain the effects on plant tissues of immersing them in solutions of different concentrations, using the terms turgid, turgor pressure, plasmolysis and flaccid

Describe the effects of osmosis on plant and animal tissues and explain the importance of water potential gradient and osmosis in the uptake and loss of water

Understand that plants are supported by the pressure of water inside the cells pressing outwards on the cell wall

Investigate the factors that influence diffusion, limited to: surface area, temperature, concentration gradient and distance

Understand diffusion as the net movement of molecules or ions from a region of their higher concentration to a region of their lower concentration (i.e. down a concentration gradient), as a result of their random movement

Understand that the energy for diffusion and osmosis comes from the kinetic energy of random movement of molecules and ions

Describe the role of water as a solvent in organisms with reference to digestion, excretion and transport

Describe that viruses can only replicate in living cells

State the main features used to place organisms into groups within the plant kingdom, limited to ferns and flowering plants (dicotyledons and monocotyledons)

State the main features used to place organisms into groups within the animal kingdom, limited to: (a) the main groups of vertebrates: mammals, birds, reptiles, amphibians, fish (b) the main groups of arthropods: myriapods, insects, arachnids, crustaceans