Identifying Organisms Answer the Following Questions Using Information from the Textbook

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Identifying Organisms Answer the Following Questions Using Information from the Textbook

NAME DATE CLASS Chapter 15 Use with Section 3 REINFORCEMENT Identifying Organisms Answer the following questions using information from the textbook. 1. Why don’t scientists use common names to identify organisms?____________________________ 2. Why are scientific names important? Give four functions for scientific names. a. b. c. d. 3. The system of ______________________________ gives each organism a unique scientific name. Use the key to species of birch trees below to answer the questions that follow. 1a. bark dark, reddish-brown, yellowish-brown to black . go to 2 1b. bark creamy white, pinkish, or gray . go to 6 2a. bark and twigs with wintergreen fragrance when cut . go to 3 2b. bark and twigs without a fragrance when cut . go to 5 3a. leaves with 8–12 pairs of veins . go to 4 3b. leaves with 4–6 pairs of veins . Betula uber 4a. bark dark red to almost black; scales smooth, 6–12 mm long . Betula lenta 4b. bark reddish-brown, peeling in loose, ragged sheets, scales hairy, 5–7 mm . Betula alleghaniensis 5a. branchlets covered near tip with many small glands, Rocky Mountains or Western Canada . Betula occidentalis 5b. branchlets smooth, shiny, no glands present, eastern U.S. Betula nigra 6a. leaves hairy on lower surface . go to 7 6b. leaves smooth, hairless underside . go to 8 7a. leaves 5–13 cm long, pointed tip . Betula papyrifer 7b. leaves 3–7 cm long, pointed tip, winter buds shiny . Betula pendula 8a. bark dull gray to grayish-white, smooth and not peeling . Betula populifolia 8b. bark white to pinkish-white, peeling . go to 9 9a. leaves 6–10 cm, round base . Betula caerulea 9b. leaves 3–5 cm, squared base . Betula pubescens. 1. Are the leaves of Betula populifolia hairy or smooth on the lower surface? ____________________ 2. How many pairs of veins are on the leaves of Betula lenta? _________________________________ 3. What is a characteristic of the bark of Betula alleghaniensis?_________________________________ 4. When a twig of Betula nigra is broken, does it give off a wintergreen fragrance? ______________ Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. 43.

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