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Download Unit A Plant Structure and Function Chapter 1 Lesson 1 How Are
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Unit A Plant Structure and Function Chapter 1 Lesson 1 How Are Plants Grouped? Grouping Plants Plants are classified according to the way they reproduce. The main difference between the two large groups of plants is that some make seeds, and some don't. Plants That Make Seeds Conifers are trees or shrubs with needle like leaves. Conifers produce seeds inside cones, but do not have flowers. • Plants like pine trees, (which are conifers) make seeds without having flowers. Plants That Do Not Make Seeds • Ferns form tiny cells on the underside of their leaves that can grow into new plants. These cells are called spores. • Ferns are large plants that have roots, stems, and leaves, but do not have flowers or produce seeds. Lesson 2 What Are the Parts of a Flower? Flowers with Four Parts • Many flowers have four main parts: 1. Sepal - cover and protect the developing flower bud (usually green) 2. Pistil - female part of the flower that has a sticky top and a thick bottom. The pistil makes eggs that grow into seeds. 3. Stamen - male part of the flower. Pollen is made in the stamen. 4. Pollen - tiny grains that make seeds when combined with a flower's egg. • The petals on a flower attract insects and birds. • Roots anchor plants in the soil. Lesson 3 How Do Flowers Make Seeds and Fruits? When sperm cells from the pollen contact the egg in the ovule, fertilization takes place. Fertilization is the process by which an egg and sperm combine to form a seed. Seeds and Fruits Within every seed is a tiny embryo that has the potential to grow into a new plant. Seeds are protected by a seed coat and contain stored food for the developing embryo. Monocot seeds have one seed leaf, while dicot seeds have two seed leaves. In a monocot seed, the stored food is found in the single, seed leaf. If a plant is classified as a dicot, then you know that it is a flowering plant. • Seeds are formed inside an ovule. Fruits form on a flowering plant after the flowers are pollinated. They grow bigger after the seeds form. Lesson 4 What is the Life Cycle of a Flowering Plant? Plants Grow From Seeds Dormancy is a resting stage during which seeds do not grow. Some seeds can remain dormant for months, even years. Dormant seeds will germinate when they have water, oxygen and the right temperature to stimulate germination. Some seeds and plants need soil to grow. • Different types of seeds need different conditions to germinate. Mature Stage of a Plant Life Cycle A flowering plant is in the mature stage of its life cycle when it produces seeds.