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Plant Love Essential Question: How do plants reproduce? Hypothesis: If I carefully dissect my flowers, then I will be able to identify the differences between monocot and dicot plants. Procedure: 1. Flowering plants are generally in one of two groups, monocots or dicots. Monocots are plants that have leaves with parallel veins, flowers with petals, sepals, and stamen in multiples of three. Dicots have leaves with branching veins, flowers with petals, sepals, and stamen in multiples of four or five. With your lab partner(s), get one of each of the two flowers from the containers of flowers. In the data section of your lab write-up, sketch each flower (include as much detail as you can). 2. Count and record, in the data table, the number of petals on each flower. Petals are the colorful outer leaf-like structures of the flower that attract bees and birds to the plant. Hummingbirds are attracted to red petals while bees are usually more attracted to purple or yellow petals. 3. Beneath the petals are green colored leaf-like structures called sepals. Sepals help support the flower when it is open. They also protect the flower when it is just a developing bud. Count the sepals for each flower and record your results. 4. Look inside the flower. You will see long thing structures sticking up out of the middle of the flower. CAREFULLY remove the petals and sepals so that the long, thin structures can be seen more easily. 5. You should see several long, thin structures, with fuzzy looking tops, that surround one longer, thicker stalk. The surrounding structures are called stamen and are the male structures for the flower. The fuzzy looking heads are called anthers and contain pollen, which encloses the sperm cells. Count the number for each flower and record your results. 6. The tall, thick structure in the middle is called the pistil, and is the female part of the flower. The star shaped top is called the stigma, and is sticky and collects pollen grains containing sperm cells. The sperm then works its way down into the much thicker base called the ovary where it fertilizes the egg. 7. Remove the pistil from the flower, being careful to remove the thick ovary at the bottom. You may have to remove the stamen as well. 8. Using a scalpel cut the ovary of one of the flowers in half and examine the internal parts with a hand lens or binocular microscope. Draw what you see in the “Ovary Dissection” space. 9. Remove one of the stamen and observe the anther under the hand lens or binocular microscope. Draw some pollen grains in the “Pollen Grains” space provided. 10. Draw one of the leaves from each flower in the “Leaf” box. Notice the “vein” patterns for the leaves and record your results in the data table. 11. Throw your flowers away, clean your workspace, and return your microscope. 12. Return to your original flower diagram and label the parts of the flowers. Name: Period: Data: Alstroemeria flower drawing Flower Comparison Data Flower Structure Number of Petals Number of Stamen Number of Sepals Number of Pistils Leaf Vein Pattern Kalenchoe flower drawing Alstroemeria Ovary Dissection (Alstroemeria) Kalenchoe Pollen Grains (Alstroemeria) Alstroemeria Leaf Drawing Kalenchoe Leaf Drawing Analysis: Part 1 (Using a Double-Bubble): Compare and contrast your two flowers and determine which is a monocot and which is a dicot. Be sure to use the data you collected to support your choice. Part 2 (In a well-written paragraph): Summarize the reproductive process in flowering plants. Be sure to include stamen, anther, pistil, stigma, ovary, pollen, petal, and sepal in your summary. Underline stamen, anther, pistil, stigma, ovary, pollen, petal, and sepal. Conclusion: Use your rubric stigma anther petal stamen pistil Flower Anatomy sepal ovary