FOREST ECOLOGY
FOREST MANAGEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Growth layer in a tree root, trunk, or limb
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Rings in a cross section of a tree root, trunk, or limb representing one year’s growth
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cell structures that transport water, minerals, and nutrients within plants from the roots to the leaves
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phloem; transports food downward in a tree
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Detailed explanation-1: -C: The cambium cell layer is the growing part of the trunk. It annually produces new bark and new wood in response to hormones that pass down through the phloem with food from the leaves. These hormones, called “auxins”, stimulate growth in cells.
Detailed explanation-2: -As mentioned, tree trunks have 5 separate layers to them. They are the outer bark, inner bark (phloem), the cambium cell layer, sapwood, and heartwood. Each layer has their very own purpose, but overall, the trunk’s primary job is to protect and support the tree. Look below to review each layer and what they do.
Detailed explanation-3: -Trees Grow: At the root tips (root apical meristem) At the cambium (old xylem cells become heartwood, old phloem cells become bark)
Detailed explanation-4: -The next portion of the trunk is called the vascular cambium. The cambium is a very thin layer of living tissue which produces new phloem to its outside and new xylem to its inside. The cambium is most active in the spring and early summer when most tree growth is taking place.