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Biology - Vascular Plants Structure and Function

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    Study Guide Biology – Vascular Plants: Structure and Function 1. Vascular Plants Plants can be grouped into two main categories based on how they move water and nutrients: nonvascular plants and vascular plants . 1.1 Two Major Plant Groups • Nonvascular plants include bryophytes . These plants do not have an internal transport system. Water and nutrients move only short distances, from cell to cell. • Vascular plants include ferns, gymnosperms, and angiosperms . These plants do have an internal transport system, which allows them to grow larger and become more complex. Because of this transport system, vascular plants are more advanced in both structure and function. 1.2 Specialized Tissues and Organs Vascular plants contain specialized tissues . A tissue is a group of similar cells that work together to perform a specific job. These tissues are organized into three main organs : • Roots • Stems • Leaves Each organ has a specific role, and together they help the plant survive, grow, and reproduce.

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    Study Guide 1.3 The Vascular System: Xylem and Phloem Inside the roots, stems, and leaves is the vascular system , made up of: • Xylem , which transports water and minerals • Phloem , which transports food made during photosynthesis This system connects all parts of the plant, allowing materials to move efficiently from one area to another. 1.4 Types of Plant Tissues The organs of a vascular plant are built from four main types of tissues : 1. Vascular tissue – moves water, minerals, and food 2. Ground tissue – supports the plant and carries out photosynthesis and storage 3. Dermal tissue – forms the outer protective covering of the plant 4. Meristematic tissue – produces new cells and allows the plant to grow Different combinations of these tissues form the roots, stems, and leaves, giving vascular plants their strength, flexibility, and ability to grow. 2. Ground Tissue Ground tissue plays an important role in a vascular plant. Its main job is to store carbohydrates that the plant produces during photosynthesis. In young plants, ground tissue makes up most of the plant’s body . It is found between the vascular tissue and the dermal tissue , filling much of the plant’s interior. 2.1 Parenchyma Cells: Photosynthesis and Storage The most common cells in ground tissue are parenchyma cells . These cells are very important because they: • Carry out photosynthesis • Store nutrients for the plant

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    Study Guide Parenchyma cells have thin cell walls , many chloroplasts , and large central vacuoles . Because of these features, they are well suited for making and storing food. These cells form most of the leaves, stems, and roots of a plant. 2.2 Sclerenchyma Cells: Strength and Support Another type of cell found in ground tissue is the sclerenchyma cell . These cells are hollow and have very strong, thick walls . Their main function is to provide strength and support . By reinforcing the ground tissue, sclerenchyma cells help the plant stay upright and resist damage. 3. Quiz Ground Tissue 1. Question The ground tissue of vascular plants is responsible for which of the following? Answer Choices • protection • storing carbohydrates • transport of minerals Correct Answer storing carbohydrates Why This Is Correct Ground tissue in vascular plants mainly functions in storage , photosynthesis , and support . One of its key roles is storing carbohydrates, such as starch, which the plant uses as an energy reserve. Protection is mainly handled by dermal tissue , while the transport of minerals is the job of vascular tissue (especially xylem).

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    Study Guide 2. Question The major cells of the ground tissue are which of the following? Answer Choices • parenchyma cells • sieve tube members • vessels Correct Answer parenchyma cells Why This Is Correct Ground tissue is made up mainly of parenchyma cells , which carry out important functions such as photosynthesis , storage , and basic support . These cells are common throughout the plant body and are especially abundant in ground tissue. Sieve tube members and vessels belong to vascular tissue , not ground tissue, and are involved in transport rather than storage or photosynthesis. 3. Question Ground tissue is composed of which of the following? Answer Choices • collenchyma cells • parenchyma cells • sclerenchyma cells Correct Answer collenchyma cells, parenchyma cells, and sclerenchyma cells

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    Study Guide Why This Is Correct Ground tissue is made up of three main cell types : parenchyma , collenchyma , and sclerenchyma cells. • Parenchyma cells are involved in photosynthesis and storage. • Collenchyma cells provide flexible support, especially in growing parts of the plant. • Sclerenchyma cells give strong, rigid support and protection. Together, these cells help the plant store food, stay supported, and carry out essential life processes. 4. Dermal Tissue Dermal tissue acts as the plant’s protective outer layer . Its main jobs are to protect the plant from injury and to reduce water loss . This tissue covers the outside surface of the plant , except in woody shrubs and trees, where it is replaced by bark . 4.1 Epidermal Cells and the Cuticle The most common cells in dermal tissue are epidermal cells . These cells form a tight, continuous layer that helps shield the plant from its environment. Covering the epidermal cells is a thin, waxy layer called the cuticle . The cuticle helps prevent water from evaporating too quickly and adds an extra layer of protection. 4.2 Guard Cells and Stomata Dermal tissue also includes guard cells , which are found in pairs. These cells surround small openings in the leaves called stomata . The stomata allow: • Gases (such as oxygen and carbon dioxide) to move in and out • Water vapor to leave the plant Guard cells control when the stomata open and close, helping the plant balance gas exchange with water conservation.

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    Study Guide 5. Quiz Dermal Tissue 1. Question Which of the following statements is a quality of dermal tissue? Answer Choices • It is covered by a thin, waxy layer. • It is the location of most cell division. • Its major function is starch storage. Correct Answer It is covered by a thin, waxy layer. Why This Is Correct Dermal tissue forms the outer protective covering of a plant. It is usually coated with a thin, waxy layer called the cuticle , which helps reduce water loss and protects the plant from damage. Most cell division occurs in meristematic tissue , and starch storage is mainly a function of ground tissue , not dermal tissue. 6. Meristematic Tissue Meristematic tissue is the plant’s growth tissue . It is the place where most cell division happens , allowing the plant to grow and develop. This tissue is described as undifferentiated , which means the cells have not yet taken on a specific job. Over time, these cells can develop into vascular, ground, or dermal tissue . 6.1 Where Plant Growth Happens Plants grow in the areas where meristematic tissue is found. One important location is at the tips of roots and stems . In these regions, the meristematic tissue is called the apical meristem .

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    Study Guide The apical meristem is responsible for primary growth , which is the growth that makes the plant longer . This type of growth allows roots to grow deeper into the soil and stems to grow taller toward the light. 6.2 Primary vs. Secondary Growth Not all growth happens at the tips. Some plants also grow wider and thicker . This type of growth is called secondary growth . Secondary growth occurs in lateral meristem tissue , which is found along the sides of stems and roots. Woody trees and shrubs show secondary growth when their stems become thicker and stronger over time. 7. Quiz Meristematic Tissue 1. Question Which of the following statements is a quality of meristematic tissue? Answer Choices • It is covered by a thin, waxy layer. • It is the location of most cell division. • It’s major function is starch storage. Correct Answer It is the location of most cell division. Why This Is Correct Meristematic tissue is responsible for plant growth . It contains actively dividing cells, so it is the main site of cell division in plants. These tissues are found in areas such as root tips and shoot tips , where growth occurs. A thin, waxy layer is a feature of dermal tissue , and starch storage is mainly a function of ground tissue , not meristematic tissue.

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    Study Guide 8. Roots Roots are an essential part of a plant’s structure and survival. They perform several important jobs that help the plant grow and stay healthy. 8.1 Main Functions of Roots The primary functions of roots are: • To anchor the plant firmly in the ground • To absorb water and minerals from the soil Most substances enter the roots by diffusion , moving from an area of higher concentration to lower concentration. In some cases, facilitated diffusion also helps substances move into root cells more efficiently. Some roots are also specialized for storage , holding extra food or nutrients that the plant can use later. 8.2 Types of Root Systems Plants can have different kinds of root systems, depending on the species. • Taproot system A taproot grows straight downward and has smaller lateral roots branching from it. This type of root system is common in dicots . • Fibrous root system A fibrous root system is made up of many thin, branching roots of similar size. This type is found in most monocots and helps hold soil in place. • Adventitious roots Adventitious roots grow from unusual places, such as stems or leaves . Plants like corn have adventitious roots that help provide extra support.

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    Study Guide 8.3 Growth Regions of a Root Roots grow from their tips, where an apical meristem produces new cells. • At the very tip of the root is the root cap The root cap protects the growing root as it pushes through the soil. • Just behind the root cap is the apical meristem This region is where active cell division takes place. • Behind the apical meristem is the region of elongation Here, cells lengthen, causing the root to grow longer. • Next comes the region of maturation In this area, cells specialize and develop into different tissues. 8.4 Root Hairs and Absorption Many epidermal cells in the region of maturation form tiny extensions called root hairs . Root hairs greatly increase the surface area of the root, allowing the plant to absorb more water and minerals from the soil. 9. Quiz Roots 1. Question What is the correct order of tissues within a root? Answer Choices • apical meristem, region of elongation, region of maturation, root cap • region of elongation, root cap, apical meristem, region of maturation • root cap, apical meristem, region of elongation, region of maturation

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