xylem (blue) carries water from the roots upwards phloem (orange) carries products of photosynthesis from the place of their origin (source) to organs where they are needed (roots, storage organs, flowers, fruits – sink); note that e.g. the storage organs may be source and leaves may be sink at the beginning of the growing seasonNefronus, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons Did you have an idea for improving this content? We’d love your input.

Plastids; Kristian Peters -- Fabelfroh, CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>, via Wikimedia Commons Bear, Robert; Rintoul, David; Snyder, Bruce; Smith-Caldas, Martha; Herren, Christopher; and Horne, Eva, "Principles of Biology" (2016). Open Access Textbooks. 1.https://newprairiepress.org/textbooks/1 Did you have an idea for improving this content? We’d love your input.

Daisies (Bellis perennis) facing the sun after opening in the morning, and they follow the sun through the dayböhringer friedrich, CC BY-SA 2.5 <https://creativecommons.org/licenses/by-sa/2.5>, via Wikimedia Commons Georgia Tech Organismal Biologyhttps://organismalbio.biosci.gatech.edu/ Did you have an idea for improving this content? We’d love your input.

Title Image: Pesticide Label 4 by Melissa Scherr, Oregon Department of Agriculture is licensed CC BY-NC-ND 2.0.Did you have an idea for improving this content? We’d love your input.

Title Image: A worker in PPE measures pesticide powder. Credit: the Pesticide Education Resources Collaborative; licensed as CC BY-NC-SA.Did you have an idea for improving this content? We’d love your input.

Title Image: An agricultural worker sprays their crops with a chemical treatment by Tony Hawkes, Office of Protected Resources is in the Public Domain.Did you have an idea for improving this content? We’d love your input.

Disease Triangle by A. Timmerman, A. Nygren, Et. al., University of Nebraska Extension. Copyright © University of Nebraska. Used with permission.Did you have an idea for improving this content? We’d love your input.

Title image: Floating row covers that keep insects out by the University of Wisconsin-Madison is copyrighted and used with permission.Did you have an idea for improving this content? We’d love your input.

Title Image: Two-spotted spider mite. Credit: Patrick Beauzay, North Dakota State University; licensed CC BY-NC-SA 3.0. Did you have an idea for improving this content? We’d love your input.

Plant tissue cultures being grown at a USDA facility. USDA, Lance Cheung, Public domain, via Wikimedia Commons Did you have an idea for improving this content? We’d love your input.

Flowers of different familiesAlvesgaspar, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons Students must have knowledge about mitosis and meiosis before studying sexual reproduction in plants. Please refer to chapter 10 & 11 of OpenStax Biology 2e. Links are provided below. OpenStax Biology 2e (Chapter 10 Cell reproduction)https://openstax.org/books/biology-2e/pages/10-introduction OpenStax Biology 2e (Chapter 11 Meiosis & Sexual reproduction)https://openstax.org/books/biology-2e/pages/11-introduction Did you have an idea for improving this content? We’d love your input.

Adventitious roots of Magnolia cutting Pistoia - Baldacci Vivai (25.06.1980, photo: Mihailo Grbić)The original uploader was Gmihail at Serbian Wikipedia., CC BY-SA 3.0 RS <https://creativecommons.org/licenses/by-sa/3.0/rs/deed.en>, via Wikimedia Commons Did you have an idea for improving this content? We’d love your input.

Title Image "Foliar Application to Soybeans" by Mike Staton, MSU Extension is used with permission. Did you have an idea for improving this content? We’d love your input.

Title image "The Natural Water Cycle" by Howard Perlman and John Evans of the United States Geological Survey is in the Public Domain. Did you have an idea for improving this content? We’d love your input.

Title Image "Root with Mycorhhizae" by the United States Department of Agriculture, Natural Resources Conservation Service is in the Public Domain. Did you have an idea for improving this content? We’d love your input.

Title Image "Nutrient bioavailability with regards to soil pH" is copyrighted and used with permission from the American Society of Agronomy, Crop Science Society of America and Soil Science Society of America. Did you have an idea for improving this content? We’d love your input.

Title Image "Figure 1" by the United States Department of Agriculture, Natural Resources Conservation Service, Soil Survey Staff is in the Public Domain. The Soil Features section gives a basic introduction to general concepts of soil including soil properties, profiles, and levels of saturation and how those features allow soil to interact with plants. Did you have an idea for improving this content? We’d love your input.