These flowers only have pistils. The styles of corn are long and grow up from the ovary and out of the sepals husks. They are called silks because of their length and delicate nature. When pollen from the tassle flower lands on the stigma at the end of the silk, the pollen tube can grow through the silk to the ovary. Obviously corn pollen is capable of growing a long tube!
Because corn is monecious and has imperfect flowers what best describes how it will produce seed? Here's the Flash animation of cross pollination. Plants can be Monoecious Some plants have flowers that are not perfect, they do not have both male and female reproductive parts in the same structure.
The plant will only self pollinate. Ask them questions like: Where is the flower on this plant? How can you tell these parts are the flower? What is the purpose of the corn flower , or any other flower? Have students manipulate the tassel of the plant and collect pollen to look at under the microscope.
Help students create slides like in the previous class period, make observations, and record findings. Take the ear off of the corn plant and husk it. Discuss the purpose of the silk at the end of the ear. Pass the ear of corn around the room for students to observe and take notes of like they did of the ovule last class period.
Explain the route that pollen must make for the pollination and fertilization to occur. Ask the students why it would be important for corn to get fertilized. Talk about factors that could affect the success for failure of pollination. Some factors could be growth of the tassels, growth of the silks, distance between the two, amount of wind, nutrition of the plant, plant pests, etc. Tell students to look in their science notebooks. Have them compare and contrast the two together as a class.
Talk about which plant as perfect and imperfect flowers. Which has complete and incomplete. Why is that? Lead the discussion into detasseling, and why that is practiced. Introduce the idea of cross-breeding and selective breeding. Ask students why people might want to use these methods. Help students discover that not all corn is planted for consumption; some must be planted for seed the following years. Therefore, not all corn fields are detasselled; only the ones planted for seed. This will be what creates the hybrid seeds.
Wrap up with a short discussion, and have students finish filling out their study sheets. Ag Facts Iowa grows more corn than any other state — most field corn, not sweet corn.
Iowa also leads the nation in soybean production, egg production, and pork production. Corn is used in a multitude of products, from packing peanuts to pop to carpet and plastics! Extension Activities how students can carry this beyond the classroom Have students collect five different types of flowers and determine if they are perfect or imperfect flowers. Have students conduct research on common Iowa agricultural crops and how they are pollinated. MS-LS Construct a scientific explanation based on evidence for how environmental and genetic factors influence the growth of organisms.
Send to Email Address Please enter an email address. Your Email Address Please enter an email address. In cross pollination , pollen is transferred from plant to plant by an insect or by the wind, both called pollinators. Specifically, from the pollen grains of the anther to the stigma of a flower of a different plant of the same species. However, during self-pollination the plant's stamen shed pollen onto its own stigma during the process.
The pollen grains are transferred from the anther to the stigma of the same flower. There are differences in the plants using the two types of pollination. For cross-pollination they are brightly colored petals, with nectar and scent, and long stamens and pistils.
For self-pollination it includes much smaller flowers. The two types of pollination can be found in many different plants. Cross-pollination occurs by insects for several plants such as apples, grapes, plums, pears, raspberries, strawberries, daffodils, tulips, and others.
It also occurs by wind for different grasses, catkins, dandelions, maples tress, and a few others.
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