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Chapter 23: Problem 14

A student examines a plant part and concludes that it is part of a stem. The presence of _____fully justifies the student鈥檚 conclusion. a. vascular tissue b. nodes and internodes c. epidermal layer d. stored carbohydrates

Short Answer

Expert verified
b. nodes and internodes

Step by step solution

01

Understand the Question

Identify what the student needs to find: the characteristic that justifies the student鈥檚 conclusion that the plant part is a stem.
02

Examine the Options

Look at all the provided options (vascular tissue, nodes and internodes, epidermal layer, stored carbohydrates) and determine which one is unique to stems.
03

Evaluate Each Option

Go through each option to see if it can be a characteristic of other plant parts as well:
04

Step 3.1: Vascular Tissue

Vascular tissue is common in both stems and leaves for conduction of water, nutrients, and food.
05

Step 3.2: Nodes and Internodes

Nodes (points where leaves are attached) and internodes (the regions between nodes) are specifically features of stems.
06

Step 3.3: Epidermal Layer

An epidermal layer is present in almost all plant parts for protection.
07

Step 3.4: Stored Carbohydrates

Stored carbohydrates can be found in various plant parts, including roots and tubers.
08

Conclusion

Based on the evaluation, only 'nodes and internodes' are specific to stems.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

vascular tissue
Vascular tissue in plants is a type of tissue specifically designed for the transport of water, nutrients, and food throughout the organism. It consists of two main components: xylem and phloem. The xylem primarily carries water and dissolved minerals upward from the roots to the rest of the plant. The phloem, on the other hand, transports the products of photosynthesis, like sugars, from the leaves to other parts. This system is crucial for maintaining the plant's health and supporting growth. While vascular tissue is present in various parts of the plant, including both stems and leaves, it is not unique to stems.
nodes and internodes
Nodes and internodes are distinct features of plant stems. A node is the point on a stem where leaves or branches are attached. This is a vital area as it can give rise to new growth such as leaves, branches, or flowers. The internode is the segment of the stem between two nodes. The length of internodes can vary significantly, influencing the overall height and appearance of the plant. These structures play critical roles in the transport of nutrients and signals between different parts of the plant. Because nodes and internodes are unique to stems, their presence is a clear indicator that a plant part is part of a stem.
epidermal layer
The epidermal layer is the outermost layer of cells in plant organs such as leaves, roots, and stems. This layer serves as a protective barrier against physical damage and pathogens and helps in preventing water loss through the plant. Epidermal cells may also have specialized functions, like the guard cells in leaves that control the opening and closing of stomata for gas exchange. While the epidermal layer is essential for a plant's protection and interaction with its environment, it is not unique to stems, as these layers are present in other plant parts as well.
stored carbohydrates
Stored carbohydrates in plants mainly include starches and sugars, which serve as energy reserves. These are stored in various parts of the plant such as roots, tubers, seeds, and sometimes even stems. Carbohydrates are synthesized during photosynthesis and then distributed to where the plant needs them or stored for later use. For example, potatoes and carrots store significant amounts of carbohydrates in their roots or tubers. While stored carbohydrates can be found in stems, their presence alone is not definitive in identifying a plant part as a stem since they are also present in other storage organs.

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Most popular questions from this chapter

Circadian rhythm refers to a pattern of behavior that recurs on a daily schedule in the absence of an external stimulus. Flowers open and close according to a circadian rhythm. If a plant is transferred to a dark environment, what will happen? a. Flowers will stay closed. b. Flowers will stay open. c. Flowers will open and close every day at the same time. d. Flowers will open and close at random times.

Where is the vascular cambium located in an established woody plant? a. between the primary xylem and the primary phloem b. between the secondary xylem and the primary phloem c. between the secondary xylem and the secondary phloem d. between the primary xylem and the secondary phloem

Students are sketching diagrams of the reproductive system of angiosperms for a plant anatomy class. These lists describe diagrams made by four students. Which diagram represents the reproductive system correctly? a. hair roots, lateral roots, and taproot b. stem, branches, and leaves c. flowers and fruit d. leaves, petioles, and branches

A time course is developed to follow the fate of the vascular bundles in the stem of dicots. Sections along the stem are fixed, stained, and observed under a microscope. What happens to the vascular bundles in the stem of a dicot as the plant matures? a. The vascular bundles join to form growth rings. b. The vascular bundles divide into primary xylem and primary phloem. c. The vascular bundles divide into secondary xylem and primary phloem. d. The vascular bundles die out.

Plants most likely detect gravity by sensing the direction in which some components respond to gravity. A mutant plant has roots that grow in all directions. Which organelle would you expect to be missing in the cell? a. mitochondria b. amyloplast c. chloroplast d. nucleus
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