A Walk in the Woods. Time Lapse: Sunflower Following The Sun. Crown The crown, which consists of the leaves and branches at the top of a tree, plays an important role in filtering dust and other particles from the air. It also helps cool the air by providing shade and reduces the impact of raindrops on the soil below. The leaves are the food factories of a tree. They contain chlorophyll, which facilitates photosynthesis and gives leaves their green color.
Through a process called photosynthesis, leaves use the sun’s energy to convert carbon dioxide from the atmosphere and water from the soil into sugar and oxygen. RootsA tree’s roots absorb water and nutrients from the soil, store sugar and anchor the tree upright in the ground. Trunk/StemThe trunk, or stem, of a tree supports the crown and gives the tree its shape and strength. Heartwood As a tree grows, older xylem cells in the center of the tree become inactive and die, forming heartwood. Xylem/SapwoodThe xylem, or sapwood, comprises the youngest layers of wood. Texas Tree Selector. What kind of Animal is This? Online Animal games for kids! Sheppard Software. Video: Sunflowers move to internal rhythm. It is one of the great symbols of summer: a sunflower (Helianthus annuus) bending to track the path of the Sun from east to west, straining to make the most of each day.
At night, the sunflower eases back towards the east in preparation for daybreak. Yet these flowers are not responding simply to light, but also to an internal clock, researchers have found. Plant biologists Hagop Atamian and Stacey Harmer of the University of California in Davis grew sunflowers in a field and then transferred them to growth chambers with a fixed overhead light that was always on. The plants continued their daily journey from east to west and back for several days after the transfer, suggesting that they were not responding only to the direction of the light, but their own timekeeper. Atamian, who presented the results this week at the annual meeting of the American Society of Plant Biologists in Portland, Oregon, also showed that the sunflowers bend when one side of the stem grows faster than the other.
G4 U3 Interactive Aquatic Food Chains. Food Chains. Www.iknowthat.com/ScienceIllustrations/foodchains/science_desk.swf. Build the food chain! Food Web. Plants Moving Toward Sunlight (timelapse) My Sunflower Timelapse: 15/3/10 - 24/7/10 - BEST EVER. Videos for teaching ecology. Last updated: 28 October 2013 In my experience, students love watching videos in class, and using them can draw students into material in a way that regular lecturing does not.
So, this is an attempt to compile a list of videos that people have found helpful for teaching about concepts typically covered in ecology courses (or the ecology section of courses like Intro Bio). I will try to update this post periodically, especially to fix any links that break or to add new resources. So, feel free to suggest additions in the comments! Notes: 1. General sites with lots of different videos:1. What is ecology? Evolutionary ecology 1. Physiological ecology1. Behavioral ecology (In my opinion, if you don’t have lots of videos in the behavioral ecology section, you’re doing it wrong!) Chemical ecology1. Competition1. Competition and Predation1. Predation (Tons of possible videos for this section; check out the BBC links above to look for more options) 1. Parasitism1. Mutualism1. Biogeography1. Marla Spivak: Why bees are disappearing.
On the Web: Habitats. Killer Whales feeding on a Humpback whale. KILLER WHALES - Diet & Eating Habits. Frontier Earth Presented by Walmart: Killer Whales feed on Stingrays. Frontier Earth Presented by Walmart: Killer Whales feed on Stingrays. The Magic Schoolbus Episode 04 Gets Eaten. Vancouver Rain Forest.