题目
题目
简答题

Use the diagram below to answer the following questions: 1. Which letter represents the bark of the tree? 2. Which letter represents the secondary phloem? 3. Which letter represents summer wood?

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To answer questions about a labeled cross-section diagram of a tree, we need to identify what each labeled letter corresponds to in typical secondary growth anatomy. 1) Which letter represents the bark of the tree? - In most tree cross-sections, the outermost tissues are collectively referred to as the bark, which includes the cork (phelloderm), cork cambium, and the phloem just beneath the cork. If letter G sits on the outermost region of......Login to view full explanation

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Choose the correct term from the pull-down menu. Each term is used exactly once. Support structures Rigid cell walls composed of carbohydrates such as [ Select ] waxy phloem cellulose stomata gravity carbon dioxide xylem carbon fixation lignin cuticle and woody tissue containing [ Select ] xylem gravity cellulose carbon dioxide stomata phloem carbon fixation lignin cuticle waxy evolved and enabled plants to grow upwards against [ Select ] xylem lignin cuticle phloem cellulose gravity carbon dioxide stomata carbon fixation waxy . Avoiding desiccation Compared to aquatic environments the air is extremely dry and poses a significant challenge to plants. Non-lignified tissues often have an outer [ Select ] cellulose waxy carbon fixation carbon dioxide xylem gravity cuticle phloem stomata lignin coating called the [ Select ] phloem xylem gravity carbon fixation cellulose lignin stomata carbon dioxide waxy cuticle that prevents water loss. The photosynthetic regions of plants have evolved [ Select ] cuticle gravity xylem stomata carbon dioxide carbon fixation waxy cellulose lignin phloem that allow for exchange of gases with the environment while regulating water loss. Alternate metabolic pathways for [ Select ] lignin xylem waxy phloem carbon fixation cuticle cellulose gravity stomata carbon dioxide  have evolved in some plants that inhabit hot and dry conditions. Collection and transport of nutrients In aquatic environments plants are surrounded by nutrients and water while on land these vital ingredients are found in different locations. Water and minerals from the soil are collected by root systems while [ Select ] cellulose carbon fixation stomata xylem cuticle phloem carbon dioxide waxy gravity lignin , found in the air, is collected through open stomata on leaves and stems to be used locally for photosynthesis. Water, nutrients and minerals are transported throughout the plant from their source by a vascular system that has developed in land plants. Vasculature that transports water and minerals from the roots is known as xylem while phloem transports carbohydrates and other nutrients from photosynthetic regions to the rest of the plant.

Which of the following cells or tissues is/are NOT commonly present in pines?

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