Plant Reproduction Lab Name: __________________ Date: ___________________ Group: _________________ Background Information : Plants use seeds to reproduce sexually. There are two types of seedproducing plants: Angiosperm s and Gymnosperms . In both types, pollen fertilizes an ovule and produces a seed; each seed contains a tiny embryo that can grow into a new plant. Angiosperms use flowers to produce seeds inside a ripened ovary that we call a fruit. Other plants produce seeds that are not contained by a fruit. These are the gymnosperms . The flowers of angiosperms have adaptations that help to ensure successful reproduction. Most flowers contain both male and female parts; these flowers are called “perfect” or “complete”. These types of flowers are capable of selfpollinating but may also be pollinated by other flowers of the same species. Many have bright colors, attractive shapes, and pleasing aromas. These traits help them attract insects and other animals that will carry pollen grains from flower to flower. Other flowers are less colorful and less aromatic; they use the wind instead of insects or animals to transfer pollen from plant to plant. Wind, insects and animals can all be “ pollinators ”. Parts of the flower are usually found in rings, also called whorls, circular layers around the center of the flower. Sepals, petals, stamens and stigmas make up the four different whorls of flowers. Sepals lie outside the petals and protect the bud before it opens. Petals form the next layer and attract pollinators. Stamens hold the male reproductive parts. The stigma contains the female reproductive parts. The stem holds up the flower, providing support and making it accessible to pollinators. The receptacle is the widened base of the stem that attaches to the flower. The stamen , or male reproductive part, consists of an anther that is held up by a filament . The anther produces pollen grains. The pistil , or female reproductive part, is made of a stigma, style and ovary. The top of the pistil is called the stigma . It is sticky to help catch and hold pollen grains that come in contact with it. The middle of the pistil is a supporting structure called the style ; its job is to hold up the stigma and connect it to the ovary below. The ovary contains ovules which, when fertilized, become seeds . 1 Attach one pin to each label for the flower structures. Working as a group, place the pins in the wax beside the corresponding parts of the flower. When you have finished, call your teacher over to check your work. Teacher initials: _______________ Score out of 12: ______________ Procedure : 1. Use the flower in the lab to record the number of each structure in the table below. Structure Number Found Function petal sepal stem anther filament stigma style ovary ovule Not visible 2. What advantage to the flower are colorful petals? 3. Why are the sepals and petals referred to as “accessory parts” (of the plant)? 2 4. What do anthers produce? 5. Name the flower part that elevates the anther. 6. Why is it important to elevate the anthers? 7. Describe two different ways that a pollen grain can get to the stigma of a pistil. 8. Flowers usually contain more stamen than pistils. Why do you think this is? 9. Name the flower part that elevates the stigma. 10. Why is it important to elevate the stigma? 11. How does the structure of the stigma aid in pollination? 12. Which parts of the flower develop into the seeds? 13. When fertilized, what will the ovary grow into? 14. Are flowers a method of sexual or asexual reproduction? 15. Is the DNA of the new plant grown from a flower’s seeds the same as the DNA of the parent plant? Explain. 3 16. Go to the exhibit of vegetative reproductive methods and complete the table below: Method of Vegetative Reproduction Brief explanation how does the new plant grow in this method Drawing 17. Are the vegetative reproduction methods shown examples of sexual or asexual reproduction? Compare the DNA of the offspring to that of the parent. 4
© Copyright 2026 Paperzz