In this lesson our instructor talks about transport of nutrients and water in plants. First she does a review of plant cell structure. Then she discusses water absorption by plants, apolast and symplast pathways. Afterward she talks about xylem structure, bulk flow, phloem structure, and translocation. Four complete example videos round up this lesson.
Water is absorbed by the roots
of plants and then distributed to the rest of the plant.
Root hairs and mycorrhizae
increase the surface area available for water absorption.
Water potential is influenced
by solute concentration and pressure. Water moves from areas of
higher water potential to areas of lower water potential.
Water and minerals enter the
root and travel to the vascular cylinders. Two routes for lateral
movement of materials through the root are the symplast and apoplast
endodermal cells surrounding the vascular cylinder are tightly
packed together and regulate the entry of water and minerals into
the vascular cylinder.
Transport of water and solutes
through the xylem relies on bulk flow. Bulk flow is the result of a
pressure gradient created by the loss of water from leaves through
transpiration. The cohesive and adhesive properties of water allow
bulk flow to occur by capillary action.
Phloem sap moves from a sugar
source to a sugar sink during translocation. A sugar source is a
site of sugar production. A sugar sink is a site of either the
consumption or storage of sugar.
Transport of Nutrients and Water in Plants
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book and CD package include three full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book has a great topic-by topic breakdown of the 14 must-know principles with sample questions and answers for each of the subjects. Laboratory Review includes a focused review of all 12 AP laboratory exercises. Included in this is 2 full length practice tests that stimulate the actual test along with answers and complete explanations.
This book includes a comprehensive biology test topic review, covering everything from photosynthesis to genetics to evolution. Cracking the AP Biology also includes testing strategies for the grid-in and essay section, great guidance on writing a high-scoring essay, and two full length practice exams with detailed explanations.