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A technician is preparing microscope slides that will display the different stages of mitosis from root samples. He compares sections from several areas of the root. Which is the best prediction of his observation? a. The technician will see mostly mitotic cells in the root cap. b. The technician will observe mitotic figures in the meristematic tissue below the cap. c. The technician will observe cell division in the elongation zone. d. The technician will see that most mitotic cells are in the maturation zone.

Short Answer

Expert verified
b. The technician will observe mitotic figures in the meristematic tissue below the cap.

Step by step solution

01

Understanding Mitosis

Mitosis is the process of cell division that results in two daughter cells each having the same number of chromosomes as the parent nucleus. It's essential for growth and development.
02

Identifying the Root Zones

Roots have different zones: the root cap, meristematic zone (where active cell division occurs), elongation zone (where cells grow larger), and the maturation zone (where cells differentiate and mature).
03

Analyzing the Choices

a. The root cap primarily protects the root tip and is not an area of cell division. b. The meristematic tissue below the cap is where active cell division (mitosis) occurs. c. The elongation zone is where cells elongate, not divide. d. The maturation zone is where cells have already differentiated.
04

Making the Prediction

Based on the analysis of each zone, the best prediction of observing mitotic cells is in the meristematic tissue below the root cap.

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Key Concepts

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

Mitosis
Mitosis is a type of cell division that plays a crucial role in the growth and development of organisms. During mitosis, a single cell divides to produce two genetically identical daughter cells. This process ensures that each daughter cell has the same number of chromosomes as the parent cell. Mitosis is essential for growth, tissue repair, and asexual reproduction in some organisms.

The process of mitosis is divided into several stages:
  • Prophase: Chromosomes condense and become visible. The nuclear envelope starts to disintegrate.
  • Metaphase: Chromosomes align at the cell's equatorial plate.
  • Anaphase: Sister chromatids are pulled apart to opposite poles of the cell.
  • Telophase: Nuclear membranes reform around the two sets of chromosomes, forming two nuclei.
  • Cytokinesis: The cytoplasm divides, resulting in two daughter cells.
Understanding the steps of mitosis is key to grasping how cell division functions in living organisms.
Root Zones
Roots serve multiple functions, including anchoring plants to the soil, absorbing water and nutrients, and storing food. These functions are supported by different zones within root structures. The main root zones are:

  • Root Cap: A protective covering at the tip of the root.
  • Meristematic Zone: Located just behind the root cap, this zone is where active cell division occurs.
  • Elongation Zone: Cells in this area expand and elongate, contributing to root lengthening.
  • Maturation Zone: Cells differentiate into various specialized cell types to perform distinct functions.
Each of these zones has a specialized role, contributing to the overall function and growth of the root.
Cell Division in Plants
Cell division is a fundamental process for plant growth and development. In plants, cell division mainly occurs in regions called meristems, which are found at the tips of roots and shoots.

In the root, the meristematic zone is crucial for mitosis. Active cell division in this zone produces new cells that contribute to root growth. As these cells move away from the meristematic zone, they enter the elongation zone, where they increase in size but do not divide. Eventually, the cells reach the maturation zone, where they differentiate into specialized cell types.

This organization ensures that new cells are constantly formed and that the roots continue to grow and adapt to the environment.
Meristematic Tissue
Meristematic tissue is a type of plant tissue consisting of undifferentiated, actively dividing cells. This tissue is essential for the growth and development of plants and can be categorized into three primary types:

  • Apical Meristems: Found at the tips of roots and shoots, responsible for primary growth that increases length.
  • Lateral Meristems: Located along the sides of stems and roots, responsible for secondary growth that increases thickness.
  • Intercalary Meristems: Found at the base of leaves or internodes, important for regrowth and recovery.
In root samples, the meristematic tissue below the root cap is where the technician would observe active mitosis. This area is critical for producing new cells that enable the root to grow and penetrate the soil. Understanding meristematic tissue helps in comprehending how plants grow and develop.

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Most popular questions from this chapter

One of the major concepts of biology is that form follows function. If that is so, what can be deduced from the shape and location of the root cap? a. It provides protection to the root tip. b. It absorbs water and minerals. c. It acts as a storage tissue. d. It replicates actively to elongate the root.

In the Northern Hemisphere, a florist grows shrubs of the same species of woody plant under two different light schedules for three weeks. The first set is maintained under 15 hours of light and 9 hours of dark daily. The second set is maintained under 9 hours of light followed by 14 hours of dark daily. The first set of plants does not form flowers, but the second set of plants blooms. What can you conclude about these plants? a. This species of shrub does not flower if the day is short. b. They bloom early in the year (around February). c. They bloom mid-summer (around June). d. The critical dark period is 9 hours.

A disruption of dynamic homeostasis in the relationship between vascular plants and insects is occurring as global climate changes. The reduction in the yield of soybeans is plotted against leaf area removed by two insects, beetles and aphids. Soybean blooms begin to develop in the week of 13 July. Prior to that time, there is no effect of leaf removal on yield, even with complete loss of leaves. In the week of 18 August, plants are beginning to form seeds, and loss of leaves can be devastating. A. One observed effect of climate change is the shift toward earlier development in many insects. Quantitatively describe the worst possible consequences for yield, assuming plant developmental timing is not altered by warming temperatures, if the peak abundance of Japanese beetles is shifted from 18 July to 13 July, and 80% of leaf area is lost. The expression of genes involved in seed development is temperature dependent, unlike the scenario suggested in part A. More than 90% of soybean seeds planted in 2015 in the soybean-corn ecosystem of the central United States are the herbicide-resistant, genetically modified 鈥淩oundup Ready鈥 variety. The seed has a patented genome. It produces seeds that are sterile and must be purchased each spring from the patent holder. B. Predict how the use of Roundup Ready seeds affects the selection of expression regulated in response to increasing temperature. Roundup is an herbicide whose active chemical component is glyphosphate. This molecule disrupts the synthesis of phenylalanine, tyrosine, and tryptophan. By inserting a gene from Agrobacteria, a Roundup Ready seed can synthesize these amino acids in the presence of the herbicide. C. Pose two scientific questions that must be considered to estimate the long- term effectiveness of this strategy for weed management.

A carrot is an example of a tap root. Which of these can also be classified as a tap root? a. the large network of superficial roots of a cactus b. a dandelion anchored by a long main root that penetrates deep into the soil c. a banyan tree鈥檚 system of roots that dangle from the branches d. a round organ that stores carbohydrates

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.

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