{"id":36799,"date":"2024-07-25T23:54:00","date_gmt":"2024-07-25T23:54:00","guid":{"rendered":"https:\/\/www.lifeandnews.com\/articles\/?p=36799"},"modified":"2024-08-08T17:40:20","modified_gmt":"2024-08-08T17:40:20","slug":"why-do-trees-need-sunlight-an-environmental-scientist-explains-photosynthesis","status":"publish","type":"post","link":"https:\/\/www.lifeandnews.com\/articles\/why-do-trees-need-sunlight-an-environmental-scientist-explains-photosynthesis\/","title":{"rendered":"Why do trees need sunlight? An environmental scientist explains photosynthesis"},"content":{"rendered":"\n

Rebekah Stein<\/a>, Quinnipiac University<\/a><\/em><\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

Curious Kids<\/a> is a series for children of all ages. If you have a question you\u2019d like an expert to answer, send it to curiouskidsus@theconversation.com<\/a>.<\/em><\/p>\n\n\n\n

\n\n\n\n

Why do trees need sunlight? \u2013 Tillman, age 9, Asheville, North Carolina<\/strong><\/p><\/blockquote>\n\n\n\n

\n\n\n\n

Trees need sunlight for the same reason you need food. The energy from the Sun\u2019s rays is a crucial ingredient in how plants make their own food that helps them power all their cells. Since trees don\u2019t harvest or hunt food, they have to produce their own. The way they make their food is a unique and important chemical process called photosynthesis.<\/p>\n\n\n\n

\"honey-comb<\/a>
Chlorophyll is what makes leaves green. Kristian Peters-Fabelfroh\/Wikimedia<\/a>, CC BY-SA<\/a><\/figcaption><\/figure>\n\n\n\n

What is photosynthesis?<\/h2>\n\n\n\n

The cells in plants and all other living things have microscopic components called organelles<\/a>. One type of organelle in plant cells is the chloroplast, and it contains the pigment<\/a> chlorophyll, which is what makes leaves green. When chlorophyll receives sunlight, it starts the photosynthesis<\/a> reaction.<\/p>\n\n\n\n

The name photosynthesis comes from the ancient Greek words \u201cphoto,\u201d which means light, and \u201csynthesis,\u201d which means to make. During this food-making process, plants take carbon dioxide from the air and water from the ground, and with the energy from sunlight, make glucose. Glucose is a very simple type of sugar. Because it is a simple compound, it is simple to make.<\/p>\n\n\n\n

Most of the time, photosynthesis occurs in leaves, and leaves take in sunlight to make food. There are some special plants, though, that actually absorb sunlight on their stems. Some of these include cactuses like the balloon-shaped golden barrel cactus<\/a>, the spiky Munz\u2019s Cholla<\/a> and the paddle-shaped prickly pear<\/a>. Some plants even have roots that can photosynthesize, like the rare palm Cryosophila albida<\/a><\/em>.<\/p>\n\n\n\n

\"A<\/a>
Sunlight gives plants the energy to turn water and carbon dioxide into carbohydrates \u2013 the food their cells need to live and grow. At09kg\/Wikimedia<\/a>, CC BY-SA<\/a><\/figcaption><\/figure>\n\n\n\n

Photosynthesis is billions of years old<\/h2>\n\n\n\n

Photosynthesis evolved more than 3.5 billion years ago<\/a>. Initially, only single-celled organisms, kind of like today\u2019s algae, could make sugar this way. Oxygen is a waste product from the photosynthesis process, and over time, these single-celled organisms released enough oxygen to change the Earth\u2019s atmosphere. Ultimately, we and all other animals needed this to happen to be able to live and breathe.<\/p>\n\n\n\n

Over time, aquatic plants developed, and gradually plants moved to land<\/a> around 500 million years ago to better access their most vital resource: sunlight. Plants eventually got taller by around 350 million years ago<\/a>. This is when the first tree evolved, which grew up to 150 feet tall. These trees looked like the evergreen trees we see today \u2013 sort of like pines, firs and spruce. And about 125 million years ago, trees that looked like the maples, oaks and beech trees we see today shared the landscape when dinosaurs ruled the Earth<\/a>.<\/p>\n\n\n\n

Not just good for plants<\/h2>\n\n\n\n

The Sun provides energy for the Earth. However, we humans are not capable of taking in the sun directly and using it to power our bodies. So how do we make use of the Sun\u2019s energy? Plants do it for us.<\/p>\n\n\n\n

Plants take in that energy and make food for us and other animals to eat and oxygen for us to breathe. We wouldn\u2019t exist without plants and photosynthesis.<\/p>\n\n\n\n

Like the ancient tiny single-celled organisms from 3.5 billion years ago, some microorganisms today use photosynthesis. Specifically, the algae that you might see living on top of lakes and the ocean do. Chlorophyll is why algae is green.<\/p>\n\n\n\n

There are aquatic plants<\/a> that use sunlight to grow. They typically make use of less sunlight because sunlight does not travel well through water.<\/p>\n\n\n\n

\"yellowish<\/a>
Some plants can do photosynthesis underwater, where there is less sunlight. Chesapeake Bay Program\/Flickr<\/a>, CC BY-NC<\/a><\/figcaption><\/figure>\n\n\n\n

In addition, there are a very few animals that can photosynthesize. The pea aphid<\/a> uses pigment to harvest sunlight to make energy. The Oriental hornet<\/a> uses a pigment in its exoskeleton to make energy from sunlight. The emerald-green sea slug<\/a> eats algae and then incorporates chlorophyll from the algae into its body to photosynthesize. Because of this strategy, the sea slug can go nine months without eating.<\/p>\n\n\n\n

So the answer to this question \u2013 why do trees need sunlight \u2013 is to make their food. And thanks to trees and other plants turning sunlight into their food, most of the rest of the living things on Earth get to eat, too!<\/p>\n\n\n\n

\n\n\n\n

Hello, curious kids! Do you have a question you\u2019d like an expert to answer? Ask an adult to send your question to CuriousKidsUS@theconversation.com<\/a>. Please tell us your name, age and the city where you live.<\/em><\/p>\n\n\n\n

And since curiosity has no age limit \u2013 adults, let us know what you\u2019re wondering, too. We won\u2019t be able to answer every question, but we will do our best.<\/em><\/p>\n\n\n\n

Rebekah Stein<\/a>, Assistant Professor of Environmental Science, Quinnipiac University<\/a><\/em><\/p>\n\n\n\n

This article is republished from The Conversation<\/a> under a Creative Commons license. Read the original article<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Rebekah Stein, Quinnipiac University Curious Kids is a series for children of all ages. If you have a question you\u2019d like an expert to answer, send it to curiouskidsus@theconversation.com. Why do trees need sunlight? \u2013 Tillman, age 9, Asheville, North Carolina Trees need sunlight for the same reason you need food. The energy from the […]<\/p>\n","protected":false},"author":44,"featured_media":36800,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3410],"tags":[4810,6689,11127,10037,4415,186,2197,5518],"_links":{"self":[{"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/posts\/36799"}],"collection":[{"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/users\/44"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/comments?post=36799"}],"version-history":[{"count":2,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/posts\/36799\/revisions"}],"predecessor-version":[{"id":36861,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/posts\/36799\/revisions\/36861"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/media\/36800"}],"wp:attachment":[{"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/media?parent=36799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/categories?post=36799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifeandnews.com\/articles\/wp-json\/wp\/v2\/tags?post=36799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}