WSU Biology 106 Exam 1 Questions and Answers Already Passed

WSU Biology 106 Exam 1 Questions and Answers Already Passed Most species extinction can be traced to what four major threats? Climate change, habitat destruction, over harvesting, and the introduction of species. Name three functions of the root? Anchors the plant, absorbs minerals and water, and stores organic nutrients. What part of the root system is responsible for absorbing the majority of minerals and water? The root hair. What two components create the stem? Internodes and nodes. What are nodes? The points where leaves attach to the stem. What are internodes? The stem segment between nodes. What are auxiliary buds? Structures that can form lateral shoots (branches). What is a terminal bud? Structure located at the tip of the stem, responsible for elongation. What is a leaf? A component of the shoot system that is responsible for most photosynthesis. What are the two main parts of a leaf? Blade and petiole. What is a petiole? A stalk, joins leaf blade to node of stem. What are the three main types of tissue systems? Dermal, vascular, and ground. What is the purpose of the dermal system? To provide a protective cover of the plant. What are two components of the dermal tissue system? The epidermis and the periderm. What is the epidermis? An outer layer of tightly packed cells. What is the periderm? A layer that replaces the epidermis in old, woody plants. What is the purpose of the vascular system and what are the two main components? To transport materials between roots and shoots; xylem and phloem. What is xylem? Vascular tissue that conducts water and dissolved minerals upwards from the root to the shoot. What is phloem? Vascular tissue that conducts sugars and other metabolic products; can transport in any direction. What is the purpose of ground tissue? What are the three main components? To perform metabolic functions. Parenchyma, collenchyma, and sclerenchyma. What are qualities of parenchyma tissue? Responsible for metabolism, contains plastids, is typically soft and lacks secondary walls. What are qualities of collenchyma tissue? Provides