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Download Plant Terms and Parts - Duplin County Schools
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Flower Pre-Quiz • 1. What is the term for a flower that completes it’s life cycle in one year? • 2. What is the edge of a leaf called? • 3. What anchors a plant to the ground? • 4. What is the term for a plant that stays green all year? • 5. What is the term for a plant that completes it’s life cycle in more than two years? • 6. What is the term for a plant whose cells are not filled with water? • 7. What plant tissue carries water and nutrients up to plant parts? • 8. What part of the flower attracts insects for pollination? • 9. What controls the opening and closing of the stomates on the bottom of a leaf? • 10. What is the chemical that makes plants green? Now lets check your answers… Plant Terms and Parts Life Cycles • Annual—a plant that completes its life cycle in one year. • Biennial—a plant that completes its life cycle in two years. • Perennial—a plant that lives more than two years. Leaf Retention • Deciduous—loses leaves during dormant season. • Evergreen—keeps leaves and remains green year-round. Hormones • Inhibitors-- hasten fruit ripening, inhibits or restrains seed germination and stem elongation. • Cytokinins-hormones that work with auxins to stimulate cell division. • Gibberellins—hormones that stimulate cell elongation, premature flowering and breaking of dormancy. • Auxins—hormones that speed plant growth by stimulating cell enlargement. • Turgid—plant is swollen or filled with Moisture in Plant moisture. • Wilted—plant is limp because it does not have enough moisture. Leaves: External Parts • Petiole—leaf stalk or part that connects leaf to stem. • Blade—the large, flat part of a leaf. • Midrib—the large center vein. • Veins—the structural framework of leaf. • Margin—the edge of leaf. Leaves: Internal Parts • Upper and lower epidermis—skin of the leaf that prevents the loss of too much moisture. • Stomates—small openings under the leaf for breathing or transpiration. • Guard cells—open and close stomates. • Chloroplasts—small green particles that contain chlorophyll, give leaves their green color and are necessary for photosynthesis. Stems: External Parts • Lenticels—breathing pores. • Bud scale scars—show where terminal buds have been located. • Leaf scars—show where leaves were attached. • Terminal bud or apical — bud on end of stem. • Axillary or lateral bud—bud on side of stem. Stems: Internal Parts • Xylem—tissue that transports water and nutrients up from roots to stems and leaves. • Phloem—tissue that transports food down from leaves to roots. • Cambium—thin, green, actively growing tissue located between bark and wood and produces all new stem cells. • Bark—old inactive phloem. • Heartwood—old inactive xylem. • Sapwood—new active xylem. Stems: Internal • Monocots—plant stems have vascular bundles that contain both xylem and phloem in each bundle—examples: grasses, corn. • Dicots—plant stems have phloem layer and xylem layer separated by cambium— example: trees. Roots: External Parts • Much different from those of stems. • Root cap—indicates growth of new cells. • Root hairs—absorb moisture (water) and minerals. Roots: Internal Parts • Much like those of stems with phloem, cambium and xylem layers. • Phloem—the outer layer and carries food down the root. • Xylem—the inner layer and carries water and minerals up to the stem. Types of Roots • Fibrous—many branched shallow roots, are easier to transplant. • Tap—long root with few branched ones, are more difficult to transplant. Flowers—develop into seeds and fruits • Sepals—green parts that cover and protect flower bud before it opens. • Petals—are really leaves that are modified to attract insects for flower pollination, the pretty part that we call flowers. • Stamens—the male flower parts that include: – Filament—short stalk that holds up the anther. – Anther—a sac-like structure that contains pollen, the male sex cells. • Pistil—the female flower part that includes – Ovules—the eggs or female sex cells that become seeds if fertilized. – Ovary—if fertilized becomes a fruit or seed coat. – Style—holds up the stigma and connects it to the ovary. – Stigma—sticky part on top of style where insects leave pollen. • Complete flower—has both male and female parts. • Incomplete flower—has only male or female parts. Functions of Plant Parts Leaves • Photosynthesis—manufactures food in green plants which is the beginning of the food chain for all living things on the earth. • Photosynthesis is the process by which carbon dioxide and water in the presence of light are converted to sugar and oxygen. • While plants use oxygen in respiration, they produce much more oxygen in photosynthesis and support life for humans. • Chemical formula for photosynthesis: 6CO2 + 6H2O + 672 Kcal = C6H12O6 + 6O2 (carbon dioxide) (water) (light energy) (glucose sugar) (oxygen) • Transpiration is the water loss from leaf surface through evaporation and is controlled by stomata Stems • Translocation—move water and minerals from roots up to the leaves and move food from the leaves down to the roots. • Support branches, leaves, flowers, fruit and seeds . Roots • Absorption—take water and nutrients from the soil and conduct them to the stem. • Anchor the plant and hold it upright. • Store food for plant use. • Asexual reproduction in some plants. Flowers • Produce seeds used for sexual reproduction. • Attract insects for pollination. Pollination is the transfer of pollen from the anther to the stigma. • Produce fruit from the ovary to protect, nourish and carry seeds.