Students learn how to measure and record plant data over time
Plants are living organisms and share common characteristics with all other living things. All organisms are composed of cells, grow, reproduce, and respond to various kinds of stimuli like temperature. However, plants have additional characteristics which distinguish them from other organisms. Plants have the ability to manufacture food (photosynthesis); have unlimited or almost unlimited growth; and cell walls made of cellulose (used in making paper). Students should learn that most plants are green, have roots, grow, have flowers, have leaves, live in soil, and drink water.
The kingdom of plants includes seed plants, algae, ferns, and mosses. Plants have many cells and tissues. They make their own food using chlorophyll (the green pigment) through a chemical process called photosynthesis, which converts water and carbon dioxide into sugars, if there is enough light. They do not move on their own.
Children sometimes mistake some invertebrate animals, like coral or sea anemones as plants. Children reason that if it looks like a plant, it is a plant. Even mushrooms, most children think is a plant because it grows. Children that just see a part of plant like a bulb, root, or seed may not think it is a plant because it is not green.
This long term project focuses on
This long term project focuses on
QUESTION: How do seasons affect plant growth?
Students will measure the height of the milkweed plant over time and then plot the information.
PRIOR RESEARCH FOR CLASS: butterflies, milkweed, plant growth
EXPERIMENTAL DESIGN: Set up enough milkweed in 5 gallon containers so children can work in partners and have their own plant to measure.Students would measure the plants individually and then get the numbers as a class project. Lab booklet should have room for students to observe the type of organisms that grow on the milkweed through time. If the area attracts butterflies then the habitat was created.
1. Look at the growth models.
The life cycle of a plant starts with a seed.
The purpose of the seed coat is primarily to protect the embryo (or baby)
plant against such hazards as excessive drying, mechanical injury, and the
digestive juices of animals (if it is eaten). Many seed coats are
impermeable to water or oxygen or are hard which helps it remain "asleep"
or dormant for a long time. When the conditions are right the dormant seed
will grow or germinate.
Roots help anchor the plant to a substrate and draw water and minerals
from the soil. Some roots form a shallow network underneath the soil
surface, while others have tap roots that can go quite far down to find
water and anchor the plant.
Stem + leaves + roots: The last model shows the difference growth that children will be measuring. Notice that there is height, width, and depth. Also the leaves will start to branch. All of this growth needs to be captured by the students in their data collection.
2. Assign a pot to 2 students and have them measure length and width. Collect the data on the “data sheets.” Eventually you will need to plot the data on a line graph. But this can be done once you have collected enough data so the students can do it as a class activity. Remember each plant has its own sheet and graph. If you know how to use an Excel Spreadsheet you can put it on one graph to compare. But not necessary for the children to learn how to collect and plot data.