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Megan Nolan

Triple Biology Revision notes:
Transport in Plants


The movement of water molecules across a partially permeable membrane from a region of high
water concentration to a region of low water concentration. Larger molecules such as starch and
sucrose cannot move across these membranes as they are too…

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Megan Nolan

Experiments are often shown with visking tubing as it represents a semi permeable
Petri dish lids reduce evaporation of water
There is no mass change in boiled potatoes as the membranes are ruptured and fully
permeable so every molecule can move through in both directions.

Xylem and…

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Megan Nolan

Adaptations of leaves:

For diffusion

Thin and flat decrease distance travelled by gases
Air spaces to increase the speed of diffusion
Stomata (pores on underside of leaf) let gases in and out
Guard cells: when there is a low CO2 level, there is a higher water gain, and…

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Megan Nolan


Transports water from soil without using energy
Transports water to leaves for photosynthesis
Cools the plant as the water travels through
Support the plant as cells become turgid (turgor pressure)

Experiment to show transpiration

- As water evaporates from leaves, more is drawn up from tube and…

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Megan Nolan

Minerals and mineral deficiencies in plants;


Artificial fertilisers i.e. NPK fertilisers, which include Nitrogen, phosphorous and potassium ions
Natural fertilisers Animal faeces/ decaying plants
Rocks Slowly erode then wash into the soil
Salts dissolved in water then absorbed by plants

Nitrogen (N)/ Potassium (K)/ Phosphorous (P)/


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