A Level Biology Revision Lesson 102: Gas Exchange - Dicotyledonous Leaf.

Task 1. Check Where this Lesson fits into your Exam Specification!

Task 2. Watch the Revision Lesson in Full.


Check Your Spec!

AQA A Level Biology Specification Reference: -3.3.2 Gas exchange by the leaves of dicotyledonous plants (mesophyll and stomata). Students could use an optical microscope to examine vertical sections through a dicotyledonous leaf.


CIE A Level Biology Specification Reference: - 7.1 Structure of transport tissues: draw and label from prepared slides plan diagrams of transverse sections of stems, roots and leaves of herbaceous dicotyledonous plants using an eyepiece graticule to show tissues in correct proportions. Draw and label from prepared slides the cells in the different tissues in roots, stems and leaves of herbaceous dicotyledonous plants using transverse and longitudinal sections.


Edexcel A Level Biology (Biology A – Salters-Nuffield) Specification Reference: - None Specific but useful for:  4.7 Know the ultrastructure of plant cells (cell walls, chloroplasts, amyloplasts, vacuole, tonoplast, plasmodesmata, pits and middle lamella) and be able to compare it with animal cells.


Edexcel A Level Biology (Biology B) Specification Reference: - Topic 4: Exchange and Transport: 4.3 Gas exchange: Understand gas exchange in flowering plants, including the role of stomata, gas

exchange surfaces in the leaf and lenticels.


OCR A Level Biology (Biology A) Specification Reference: - Module 3: Exchange and transport: In this module, learners study the structure and function of gas exchange and transport systems in a range of animals and in terrestrial plants.  3.1.3 Transport in plants: (b) (i) the structure and function of the vascular system in the leaves of herbaceous dicotyledonous plants.

OCR A Level Biology (Biology B) Specification Reference: -2.2.4 Transport systems in plants: the structure & function of leaves. To include xylem vessels, sieve tube elements and companion cells in the roots, stems and leaves of monocotyledonous crop plants (cereals) and dicotyledonous crop plants (broad-leaved crops e.g. carrots, potatoes). 


WJEC A Level Biology Specification Reference: - Requirements for Life: 1. Adaptations for gas exchange. The role of the leaf as an organ of gas exchange, including stomatal opening and closing. SPECIFIED PRACTICAL WORK. Scientific drawing of a low power plan of a prepared slide of T.S. dicotyledon leaf e.g. Ligustrum (privet), including calculation of actual size and magnification of drawing.

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