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Edexcel IGCSE Biology Topic 3 - Plant Physiology




Below is everything the examiners think you know, if you're not sure of something click on the link to watch my YouTube video explanation. For a copy of these you can print off, get the FREE revision guide I wrote for you.


 • I can recall the word and symbol equation for photosynthesis

 • I can describe the transfer of energy in photosynthesis

 • I can explain how different factors affect the rate of photosynthesis. Including temperature, light intensity, carbon dioxide concentration and the amount of chlorophyll

 • I can describe what the glucose produced in photosynthesis can be used for

 • I can describe the structure of a leaf and how it is adapted of photosynthesis

 • I can explain how plants can be damaged by nitrate, phosphate, potassium and magnesium deficiency

 • I can describe investigations involving photosynthesis:-A water plant producing oxygen in light-Starch production in light-Roles of light, carbon dioxide and chlorophyll

 • I can describe gas exchange using the word ‘diffusion’

 • I can describe gas exchange in both photosynthesis and respiration

 • I can state how the parts of a leaf is adapted for gas exchange

 • I can describe how stomata help with gas exchange

 • I can state that respiration happens during the day and night, but that photosynthesis needs day light to allow the exchange of oxygen and carbon dioxide

 • I can describe an investigation of the effect of light into the gas exchange from a leaf using hydrogen carbonate as an indicator

 • I can describe the role of phloem in a plant

 • I can describe the role of xylem in a plant

 • I can describe how water is absorbed by root hair cells

 • I can describe transpiration

 • I can describe how humidity, wind speed, temperature and light intensity affect transpiration

 • I can describe the experiment into the role of environmental factors in determining the rate of transpiration from a leafy shoot

 • I can describe the stimuli that plans respond to

 • I can describe how auxins work

 • I can explain what happens in phototropism

 • I can explain what happens in gravitropism or geotropism

 • I can compare the adaptations of wind-pollinated flowers to insect-pollinated flowers

 • I can describe the growth of a pollen tube and the steps of flower fertilisation

 • I can describe experiments investigating the conditions needed for the germination of seeds

 • I can describe how seeds use food reserves to germinate

 • I can describe how plants reproduce asexually naturally and artificially