Synopsis: BIOLOGY is an authoritative majors textbook with evolution as a unifying theme. In revising the text, McGraw-Hill has consulted extensively with previous users, noted experts and professors in the field.

• Raven Biology Of Plants Pdf

It is distinguished from other texts by its strong emphasis on natural selection and the evolutionary process that explains biodiversity. Not only has the book been thoroughly updated to reflect rapid advances, there is more emphasis today on the teaching of concepts and this has led to significant changes in how the material is presented. Technology also plays a greater role in teaching and the Online Learning Center found at provides professors and students alike with an abundance of resources. Five considerations influenced this revision. They are: 1) Focus on concepts; 2) Reinforcing Ideas; 3) Emphasizing relevance to students; 4) Keeping up with new developments; and 5) Careful editing.

About the Author: Peter H. Raven, Ph.D., is director of the Missouri Botanical Garden and Engelmann professor of botany at Washington University at St. He oversees the garden's internationally recognized research program in tropical botany-one of the world's most active in the study and conservation of imperiled tropical habitats. Raven's botanical research and work in the area of tropical conservation have earned him numerous honors and awards, including a MacArthur Fellowship. He has written 17 textbooks and more than 400 articles, and he is a member of th National Academy of Science and the National Research Council. 'About this title' may belong to another edition of this title. Terms of Sale: Preferred Payment Methods: Payments from online credit card processing (Via the Abe website).

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Raven Biology Of Plants Pdf

A closing trap The can count to two and five in order to trap and then digest its prey. The Venus flytrap is a that catches its prey with a trapping structure formed by the terminal portion of each of the plant's leaves, which is triggered by tiny hairs on their inner surfaces.

When an insect or spider crawling along the leaves contacts a hair, the trap prepares to close, snapping shut only if a second contact occurs within approximately twenty seconds of the first strike. The requirement of redundant triggering in this mechanism serves as a safeguard against wasting energy by trapping objects with no nutritional value, and the plant will only begin digestion after five more stimuli to ensure it has caught a live bug worthy of consumption. The mechanism is so highly specialized that it can distinguish between living prey and non-prey stimuli, such as falling raindrops; two trigger hairs must be touched in succession within 20 seconds of each other or one hair touched twice in rapid succession, whereupon the lobes of the trap will snap shut, typically in about one-tenth of a second. Arabidopsis thaliana.