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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Tree rings occur _______.

  1. a. when there are droughts during the time the rings form
  2. b. where environmental conditions influence xylem cell size
  3. c. if heartwood alternates with sapwood
  4. d. as epidermis replaces periderm

Summary Introduction

Concept introduction: In response to the seasonal changes in the environment, a tree adjusts its growth. These adjustments affect the way it produces wood. The tree rings can be used to estimate the average annual rainfall, to date the archaeological ruins, to gather the evidence of wildfire, flood and landslides, and to study the effects and ecology of parasitic insect populations.

Explanation

Reasons for the correct statement:

The tree wood that formed during the rapid growth time is the early wood consisting of a large diameter, thin-walled xylem. The wood that formed on the slow growth time is the late wood, which consists of a small diameter, thick-walled xylem. The tree ring or the growth ring consists of a layer of early ring and late ring.

Option b. is given as, “where environmental conditions influence xylem cell size”. As the tree rings are formed when the environmental conditions influence the xylem cell size, option b. is correct.

Reasons for the incorrect statements:

Option a. is given as, “when there are droughts during the time the rings form”.

When there is a drought condition during the time that the ring forms, it will not lead to the tree ring formation...

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