Ch 06 - TISSUES9th Science
Tissue Definition
What is the precise biological definition of a tissue, and what core evolutionary advantage does it provide to multicellular organisms?
What is the precise biological definition of a tissue, and what core evolutionary advantage does it provide to multicellular organisms?
Definition:
A tissue is a group of cells that are similar in structure and/or work together to achieve a particular specialized function.
Evolutionary Advantage:
- Tissues enable the division of labour.
- By grouping specialized cells together at definite places in the body, organisms achieve the highest possible efficiency of function (e.g., muscle cells strictly for movement, nerve cells strictly for transmitting messages).
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Plant vs. Animal Tissues
Contrast plant and animal tissues based on their energy requirements, cellular state (living vs. dead), and growth patterns.
Contrast plant and animal tissues based on their energy requirements, cellular state (living vs. dead), and growth patterns.
1. Energy & Cellular State:
- Plants: Stationary. Require less energy. Most supportive tissues possess dead cells (for rigid mechanical strength).
- Animals: Highly mobile. Require high energy. Most tissues consist of living cells.
2. Growth Pattern:
- Plants: Growth is localized to specific regions (meristems). Tissues are divided into dividing (meristematic) and non-dividing (permanent).
- Animals: Growth is more uniform across the body. There is no sharp demarcation between dividing and non-dividing regions.
Prism Memory Hook
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Types of Meristems
Identify the three types of meristematic tissues based on their location, and state the specific dimensional growth each is responsible for.
Identify the three types of meristematic tissues based on their location, and state the specific dimensional growth each is responsible for.
1. Apical Meristem:
- Location: Growing tips of stems and roots.
- Function: Increases the length (primary growth).
2. Lateral Meristem (Cambium):
- Location: Lateral sides of stems and roots.
- Function: Increases the girth or diameter (secondary growth).
3. Intercalary Meristem:
- Location: At the base of leaves or internodes (on either side of the node).
- Function: Promotes longitudinal growth of nodes/branches.
Prism Memory Hook
Apex for Altitude (Length), Lateral for Latitude (Girth).
Also in this chapter
44 more cards to study in Prism
- 4Meristematic Tissue: Vacuole Absence
- 5Cellular Differentiation
- 6Simple vs. Complex Permanent Tissues
- 7Parenchyma Tissue
- 8Chlorenchyma vs. Aerenchyma
- 9Collenchyma Tissue
- 10Sclerenchyma Tissue
- 11Sclerenchyma in Fruits
- 12Epidermis & Cutin
- 13Epidermal Cell Wall Asymmetry
- 14Root Epidermis Adaptation
- 15Components of Phloem
- 16Stomata & Guard Cells
- 17Formation of Cork (Bark)
- 18Cutin vs. Suberin vs. Lignin
- 19Components of Xylem
- 20Water Conduction in Gymnosperms
- 21Xylem vs. Phloem Dynamics
- 22Fluid Connective Tissue: Blood
- 23Tree Growth Dynamics
- 24Animal Tissues Overview
- 25Epithelial Tissue Architecture
- 26Cartilage Tissue
- 27Squamous & Stratified Epithelium
- 28Areolar Connective Tissue
- 29Columnar & Ciliated Epithelium
- 30Cuboidal & Glandular Epithelium
- 31Connective Tissue & The Matrix
- 32Skeletal Connective Tissue: Bone
- 33Bone Microstructure
- 34Ligaments vs. Tendons
- 35Adipose Tissue (Fat)
- 36Muscular Tissue Mechanism
- 37Striated (Skeletal) Muscle
- 38Leukocytes (WBCs) Classification
- 39Smooth (Unstriated) Muscle
- 40Cardiac Muscle
- 41Cartilage Histology
- 42Muscle Nucleation & Branching Summary
- 43Neuron Architecture
- 44Areolar Tissue Cellular Components
- 45Nerves and Nerve Impulses
- 46Structure of Sieve Tubes
- 47Rapid-Fire Tissue Identification
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