Discovering the parts of a flower.
Insects, and some
other animals, regularly visit flowers for the sugary nectar and
protein-rich pollen they produce. This act of pollination is the first
step in fruit and seed production. Any insects, birds, and bats act as
pollinators. Both the plants and their animal pollinators have developed
unique relationships and structures that allow them to successfully
interact. For example, the long tongue (proboscis) of moths and
butterflies allows them to reach nectar produced deep inside of flowers.
In many cases both the animal and the plant benefits from this interaction
as the animal obtains food and the plant is pollinated. However, some
animals may steal nectar or pollen without
Humans also are dependent on insect-pollinated plants for foods, medicines and clothing. Worldwide three-fourths of all food and feed crops require pollinators to reproduce. We can even thank a species of fly for pollinating the cocoa plant that we use to make chocolate!
Successful pollination depends on pollinators finding the right flowers at the right time.
Pollinators locate appropriate flowers by visual and chemical cues. Since the structure of the mouthparts of pollinators differ greatly as do flower structures, the pollinator also has to locate the right type of flower.
Adaptations such as bright colors, strong fragrances,
special shapes, and nectar guides are used to attract suitable
many structures. Not all
flowers have all the idealized parts and some are hard to see.
In this activity students will discover the parts of a flower that
is available. We will describe
the stamen, style, sepals and petals.
§ Slide 1. First review that flowers make seeds using pollen. PollInators get food as they travel from plant to plant.
them to name a few pollinators they know.
§ Flowers are bright to bring the pollinators to the flower.
§ Slide 2. Go over the parts of a flower. Tell them the main four to remember are pistil, stamen, petal and sepal. Ask them at the end what those four do.
§ Slide 3. Pass out handout. Tell them they are going to make a color guide for flowers. Ask them to color the word petal and then color the petals in the drawing the same color. It doesn’t matter what color they choose as long as the name and flower part are the same. Repeat for other words.
2. Collect flowers that children will dissect. Use meat trays for the students to perform their dissection.
3. You may want to use a plastic knife or scissor, depending on what plant you have found to dissect. Ideally it would be good for each child to have their own flower. You also may want to get 2-4 different types of flowers and have the students compare amongst.
Stamens produce the pollen and pistils house the future seeds. A pistil typically consists of an expanded basal portion called the ovary, an elongated section called a style and an apical structure that receives pollen called a stigma.