Plant Reproduction: Lesson and Quiz PDF

Lesson 3 Plant Reproduction  Focus Question How do plants reproduce? Objectives  Vegetative Reproduction Vegetative reproduction is a form of asexual reproduction where the new plant grows from parts of the old plant. Results in a clone of the original plant Advanta...

Lesson 3 Plant Reproduction  Focus Question How do plants reproduce? Objectives  Vegetative Reproduction Vegetative reproduction is a form of asexual reproduction where the new plant grows from parts of the old plant. Results in a clone of the original plant Advantages to vegetative reproduction: Faster Produces uniform offspring Can produce fruit without seeds  Flower Structure Flower Organs Flowers have organs for protection, support, and reproduction. In general, flowers have four organs: sepals, petals, pistils, and stamens.  Flower Structure Flower Organs Sepals protect the flower bud and can look like small leaves or even resemble the flower’s petals. Petals usually are colorful structures that can both attract pollinators and provide them with a landing platform.  Flower Structure Flower Organs Stamens are the male reproductive structure. The female reproductive structure is called the pistil.  Flower Structure Animal pollination: Flowers are brightly colored or strongly scented to attract pollinators.  Flower Structure Wind pollination: Flowers lack showy or fragrant flowers and produce large amounts of lightweight pollen.  Flowering Plants (angiosperm) Seed and Fruit Development The zygote undergoes many cell divisions to become an embryo. The endosperm tissue, provides nutrients to the growing embryo. The endosperm is mostly absorbed into the cotyledons of eudicots, but in monocots it accounts for a large volume of the seed. Flowering Plants  Flowering Plants Seed and Fruit Development As the endosperm matures, the outside layers of the ovule harden and form a protective tissue called the seed coat. The ovary of a plant can contain one or many ovules. As the ovule develops into a seed, changes occur in the ovary that cause it to develop into a fruit.  Flowering Plants Seed Dispersal Fruits help disperse the seeds away from their parent plant, reducing competition and increasing their chance of survival. Some seeds pass unharmed through the digestive tracts of animals before being deposited. Some seeds have structural modifications that enable them to be transported by water, animals, or wind.  Flowering Plants Seed Germination When the embryo in a seed starts to grow, the process is called germination. Germination begins when a seed absorbs water. The first part of the embryo to appear outside the seed is the radicle. The hypocotyl is the first part of the seed to appear above ground.  Flowering Plants https://www.youtube.com/watch?v=ECibetK2EYI&t=83s  Flowering Plants Seed Germination Seeds produced at the end of the growing season may enter dormancy, a state of little to no growth, to increase survival in harsh conditions. The length of dormancy varies from species to species.  Quiz 1. Which is NOT part of a seed? A cotyledon B embryo C endosperm D pollen CORRECT  Quiz 2. Which does not describe vegetative reproduction? A It increases genetic C It is fairly rapid. variation. CORRECT B It is asexual. D It requires two gametes.  Quiz 3. From which structure is a fruit usually formed? A sepal C pistil CORRECT B stamen D petal  Quiz 4. What is the inactive period of a seed? A alternation of C fertilization generations B dormancy D photoperiodism CORRECT  Quiz 5. Which is the male organ of a flower? A stamen CORRECT B pistil C petal D sepal  Quiz 6. Which best describes pollen production in wind- pollinated flowers? A small amounts of pollen C large amounts of pollen CORRECT B larger pollen grains D large quantities of nectar