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Plant tissues and transport

5 lessons in Organisation.

29 exam questions · 62 marks

2.16 Plant tissues and the leaf The leaf as a plant organ: the epidermis, palisade and spongy mesophyll, xylem, phloem and meristem tissues, and how guard cells open and close the stomata, with how each is adapted for photosynthesis and gas exchange. AQA Edexcel OCR 2.17 Root hair cells, xylem and phloem How root hair cells take up water by osmosis and mineral ions by active transport, and how xylem (dead, lignified, hollow tubes) and phloem (living sieve tube cells with sieve plates) are adapted to transport water and sugars. AQA Edexcel OCR 2.18 Transpiration and translocation How water moves through a plant in the transpiration stream, how light intensity, temperature, air movement and humidity change the rate of transpiration, and how sugars are moved by translocation in the phloem. AQA Edexcel OCR 2.19 Measuring transpiration with a potometer How to set up a bubble potometer, measure how far the air bubble moves, calculate the rate of water uptake (including volume from the tube radius), and why water uptake is not exactly the same as transpiration. AQA Edexcel OCR 2.20 Plants in extreme environments Edexcel: how leaf size and shape, the waxy cuticle and the number and position of stomata help plants such as cacti, marram grass and pine trees to survive hot, dry, windy or cold places by reducing water loss. Separate only Edexcel