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Chapter 23: Problem 8

A branch of celery is soaked in a glass of water containing food dye. Soon, the tough fibers in celery branch are colored. What tissue do the tough fibers contain? a. dermal tissue b. xylem c. phloem d. ground tissue

Short Answer

Expert verified
b. xylem

Step by step solution

01

Understand the Function of the Tissues

First, understand the functions of the different tissues listed in the options: dermal tissue, xylem, phloem, and ground tissue.
02

Identify the Role of Xylem

Xylem is the tissue responsible for the transport of water and nutrients from the roots to the rest of the plant. It is typically involved in the movement of fluids within the plant.
03

Link the Dye Movement to Xylem

The dye in the water gets transported up the celery branch through capillary action, which occurs in the xylem tissue. This causes the tough fibers in the celery to become colored.
04

Conclusion

Based on the observation that the tough fibers in the celery are colored, and knowing that xylem tissue is responsible for fluid transport, the tough fibers contain xylem.

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Key Concepts

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

plant tissue types
Plants have several types of tissues that serve different functions and are crucial for their growth and survival. The main types include:
  • Dermal tissue: This is the outer protective layer of the plant. It acts like the skin of the plant, protecting it from water loss, herbivores, and pathogens.
  • Ground tissue: This makes up most of the plant's body and serves various functions like storage, photosynthesis, and support. It includes tissues like parenchyma, collenchyma, and sclerenchyma.
  • Vascular tissue: Comprising xylem and phloem, this tissue is responsible for the transport of water, nutrients, and sugars throughout the plant.
Understanding the role and function of these tissue types helps explain how plants transport nutrients and maintain their structure. In the given exercise, identifying the xylem's role in water transport leads to the solution.
water transport in plants
Water transport in plants is a critical function that supports various physiological processes like photosynthesis, nutrient transport, and temperature regulation. Here are the essential steps involved:
  • Absorption by roots: Roots absorb water from the soil through root hairs, which increases the surface area.
  • Movement through Xylem: Water moves up from the roots to the rest of the plant through xylem vessels. This process is driven by transpiration (the evaporation of water from the leaves) and capillary action in the xylem.
  • Transpiration pull: As water evaporates from the leaf surfaces, it creates a negative pressure that pulls more water up from the roots.
The exercise demonstrates this concept with the celery experiment. When the celery stalk is placed in dye water, the dye travels up the xylem and colors the tough fibers, making the xylem's role in water transport evident.
xylem and phloem
Xylem and Phloem are the two main components of the plant鈥檚 vascular system, and each has distinct roles:
  • Xylem: This tissue is responsible for transporting water and dissolved minerals from the roots to every part of the plant. The movement in xylem is only upwards, facilitated by transpiration pull, root pressure, and capillary action. The xylem also provides structural support because of the lignin present in its walls.
  • Phloem: In contrast to xylem, phloem transports the organic nutrients (mainly sugar) produced during photosynthesis from the leaves to other parts of the plant. This process, known as translocation, can go both upwards and downwards, distributing energy for growth and storage.
In the exercise, the observation of dyed fibers in the celery confirms the presence and function of xylem in transporting water, highlighting the fundamental difference between the roles of xylem and phloem in plant physiology.

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Most popular questions from this chapter

How is a leaf different from a leaflet? a. A leaf petiole attaches directly to the stem at a bud node, whereas a leaflet petiole is attached to the main petiole or the midrib, not the stem. b. A leaf has reticulate venation whereas leaflets show parallel venation. c. A leaf petiole attaches to the main petiole or the midrib, not the stem, whereas a leaflet petiole attaches directly to the stem at a bud node. d. A leaf has parallel venation whereas leaflets show reticulate venation.

How do the locations and the functions of the three types of meristematic tissues compare? a. Apical meristems found in the tip of stems and roots promote growth by elongation; lateral meristems found at nodes and bases of leaf blades promote increase in length and intercalary meristems found in the vascular and cork cambia promote increase in girth. b. Apical meristems found at nodes and bases of leaf blades promote growth by elongation; lateral meristems found in the vascular and cork cambia promote increase in girth and intercalary meristems found in the tip of stems and roots promote increase in length. c. Apical meristems found in the tip of stems and roots promote growth by elongation; lateral meristems found in the vascular and cork cambia promote increase in girth and intercalary meristems found at nodes and bases of leaf blades promote increase in length. d. Apical meristems found in the tip of stems and roots promote growth by elongation; lateral meristems found in the vascular and cork cambia promote increase in length and intercalary meristems found at nodes and bases of leaf blades promote increase in length.

The process of bulk flow transports fluids in a plant. What are the two main bulk flow processes? a. Movement of water up the xylem and movement of solutes up and down the phloem b. Movement of water up the phloem and movement of solutes up and down the xylem. c. Movement of water up and down the xylem and movement of solutes up the phloem d. Movement of solutes up the xylem and movement of water up and down the phloem

Some desert plants have taproots that extend up to 20-30 feet underground. Others have fibrous root systems that cover wide areas. What are the advantages of a deep taproot and the advantages of a fibrous root system in a desert? a. A deep taproot can reach the deeper soil regions that stay moist after several rainfalls. A shallow fibrous system provides additional support to anchor the plant in the desert. b. A deep taproot provides additional support to anchor the plant in the desert. A shallow fibrous system increases the amount of water that can be absorbed after a light rainfall when the soil dries quickly in the desert. c. A deep taproot increases the amount of water that can be absorbed after a light rainfall when the soil dries quickly in the desert. A shallow fibrous system can reach the deeper soil regions that stay moist after several rainfalls. d. A deep taproot can reach the deeper soil regions that stay moist after several rainfalls. A shallow fibrous system increases the amount of water that can be absorbed after a light rainfall when the soil dries quickly in the desert.

A student reported vascular tissue while inspecting a cross-section of a plant stem under the microscope. Which cells would allow the student to identify vascular tissue? a. tracheids, vessel elements, sieve-tube cells, and companion cells b. cells actively dividing at the apex of the stem c. parenchyma cells at the center of the section d. cells covered by a cuticle at the outside edge of the section
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