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Ninth Grade, Plant Biology Projects, Lessons, Activities (25 results)

Plants provide us with so much — oxygen to breath, food to eat, materials to make clothing and paper, and beautiful flowers and leaves to admire! How can plants be so diverse and survive in so many kinds of climates? How do they know how to grow towards the sun? Why do some plants not have seeds? Explore the amazing and beautiful world of plants.

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Make a Biohybrid Robot
Science Fair Project Idea
Engineering Design Process
When you think of robots, you might think of things made out of plastic or metal...but what about living materials? Living materials have one big advantage: they can heal and repair themselves if they get damaged. Since it might not always be easy to repair a damaged robot (for example, a robot on another planet), some scientists want to figure out how to include living, or biological, materials in them to create "biohybrid" robots. In this project, you will create your own simple biohybrid… Read more
Suck It Up! How Water Moves Through Plants
STEM Activity
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113 reviews
Have you ever heard someone say, "That plant is thirsty," or, "Give that plant a drink of water"? We know that all plants need water to survive, even bouquets of cut flowers and plants living in deserts. But have you ever thought about how the water moves within the plant? In this activity, you will put carnations in dyed water to figure out where the water goes. Where do you think the dyed water will travel, and what will this tell you about how the water moves in the cut flowers? Read more
Hydroponics Made Easy
STEM Activity
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137 reviews
Do you think plants can grow without soil? If you've tried growing vegetables, you probably planted the seeds or seedlings in soil. Soil gives the plants the nutrients they need to grow. However, plants can grow without soil, too, using a process called hydroponics. In this activity, you will transform a bottle into a mini-garden that needs only light, air, and nutrient-rich water to grow! Read more
Grow Plants in Microgravity with an Arduino Clinostat
Science Fair Project Idea
Scientific Method
Can humans grow food in space? Can we grow plants on the Moon or on a space station? This is an important question to answer as humans look to expand our existence to the Moon, Mars, and beyond. In this science project you will build a clinostat, a device that can simulate microgravity right here on Earth and use it to explore the effects of microgravity on plant growth. Read more
Find the Hidden Colors of Leaves
STEM Activity
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Have you ever wondered why leaves change from green to an amazing array of yellow, orange, and red during the fall? Leaves get their brilliant colors from pigments made up of various color-creating molecules. During the warm, sunny months, plants use their leaves to turn sunlight into food energy, a process called photosynthesis. This primarily uses a pigment that reflects green light, which gives the leaves their characteristic color. In autumn, when colder, shorter days arrive, many kinds of… Read more
Is It Ripe Yet? Build a Circuit to Detect Ripe Produce
Science Fair Project Idea
Scientific Method
When you go to the supermarket, how do you pick out ripe fruits and vegetables? You might look at their size or color, or feel them for firmness. That might be easy to do when you pick out a half dozen apples, but imagine if you had to examine thousands of apples growing in a field, or strawberries coming down a conveyor belt getting ready for packaging. Suddenly, it is a lot harder to do yourself! What if a machine could pick and sort the produce for you? In this project, you will address part… Read more
Plants on the Move! Experiments with Phototropism
Science Fair Project Idea
Scientific Method
Plants move—not very quickly compared to animals, but they do move. Their roots grow downward in response to gravity, and their stems grow upward toward the Sun. In this plant biology science fair project, you will investigate how young plants respond through movement to light. Read more
Monitor Your Plants with a Soil Moisture Sensor
Science Fair Project Idea
Scientific Method
Do you or your family have a lawn, garden, or potted plants that you water regularly? Irrigation—or the artificial application of water to plants and landscaping—accounts for over two-thirds of the world's freshwater consumption (U.S. Geological Survey, 2016)! While that total includes farms, in the United States landscape irrigation still accounts for almost one-third of residential water use. As much as half of that water is wasted due to inefficient watering methods (WaterSense,… Read more
Stomata Printing: Microscope Investigation
Lesson Plan Grade: 3rd-12th
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"Backlit Leaf" © 2011 Threthny Plants have many crucial roles on our planet, and among these is the gas exchange that happens within their leaves. As plants take in carbon dioxide from our atmosphere, they release oxygen and retain the carbon. In this lesson, students will investigate leaves up close to look for the structures responsible for gas exchange. Read more
Exploring the Chemistry of Red Flower Pigments
Science Fair Project Idea
Scientific Method
Are all reds the same? Find out in this science fair project! Investigate if the pigments in one type of red flower are different from those in another type of red flower. Flowers contain an assortment of amazing chemicals that produce color. In this plant biology project, you will analyze the colored pigments in different plants' red flower petals using paper chromatography, and compare the pigments in the different flowers. Read more
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