AQA new specification-Tissues, organs and transport systems in plants-B4.6 + B4.7

***Please note this is two lessons comnined into one. ***
Tissues, organs and transport systems lesson created in accordance to the NEW AQA Specification (9-1). Designed for a higher ability class, although content can be adjusted to suit any ability.Includes powerpoint timers, slide animations, embedded video’s and mini review. NB: If you are unable to play embedded videos please view slide notes for link.

AQA spec link: 4.2.3.1
Relevant chapter: B4 Organising animals and plants. AQA Biology combined/third edition textbook-Page 62-65
Students are required to know the following
Students should be able to explain how the structures of plant tissues are related to their functions.
Plant tissues include:
• epidermal tissues
• palisade mesophyll
• spongy mesophyll
•xylem and phloem
•meristem tissue found at the growing tips of shoots and roots.
The leaf is a plant organ. Knowledge limited to epidermis, palisade and spongy mesophyll, xylem and phloem, and guard cells surrounding stomata. Students should be able to explain how the structure of root hair cells, xylem and phloem are adapted to their functions.

Root hair cells are adapted for the efficient uptake of water by osmosis, and mineral ions by active transport. Xylem tissue transports water and mineral ions from the roots to the stems and leaves. It is composed of hollow tubes strengthened by lignin adapted for the transport of water in the transpiration stream. The role of stomata and guard cells are to control gas exchange and water loss.
Phloem tissue transports dissolved sugars from the leaves to the rest of the plant for immediate use or storage. The movement of food molecules through phloem tissue is called translocation.
Phloem is composed of tubes of elongated cells. Cell sap can move from one phloem cell to the next through pores in the end walls.
Detailed structure of phloem tissue or the mechanism of transport is not required.