Tissues in One Shot | Class 9 | Science | BYJU'S

BYJU'S - Class 9 & 102 minutes read

The class discusses plant tissues, including meristematic and permanent tissues, emphasizing their roles in plant growth. Different types of permanent tissues like parenchyma, colon Kima, Scaren Kima, and protective tissues are also covered, highlighting their unique characteristics and functions.

Insights

  • Plant tissues are categorized into meristematic and permanent tissues, with meristematic tissues playing a crucial role in plant growth through continuous division and further classification into apical, lateral, and intercalary meristems based on location and function.
  • Epithelial tissues serve protective, secretory, and absorptive functions in various body parts, with components like cilia aiding in movement, glandular epithelium secreting substances like enzymes, and villi facilitating absorption in the small intestine.

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Recent questions

  • What are the different types of plant tissues?

    Meristematic and permanent tissues.

  • What are the unique features of Parenchyma tissue?

    Chlorenchyma and aerenchyma functions.

  • How do Scaren Kima cells contribute to plant structure?

    Mechanical support and seed covering.

  • What are the functions of epithelial tissues in the body?

    Protective, secretory, and absorptive functions.

  • What are the characteristics of muscular tissues?

    Voluntary and involuntary functions.

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Summary

00:00

"Plant Tissues: Growth and Structure Explained"

  • The class is focused on discussing tissues in a one-hour session.
  • The teacher, Anita, welcomes the students and clarifies that it's not her birthday.
  • The class is interactive with students wishing each other and discussing various topics.
  • Anita emphasizes the importance of paying attention and subscribing to the channel for quality education.
  • The class delves into plant tissues, categorizing them into meristematic and permanent tissues.
  • Meristematic tissues continuously divide and play a crucial role in plant growth.
  • Meristematic tissues are further classified into apical, lateral, and intercalary meristems based on location and function.
  • Permanent tissues, derived from meristematic tissues through cell differentiation, are divided into simple and complex types.
  • Simple permanent tissues have specific characteristics like intercellular spaces and provide structural support.
  • Parenchyma, a type of simple permanent tissue, includes chlorenchyma and aerenchyma, with distinct functions like photosynthesis and buoyancy.

16:18

Plant Tissues: Structure and Functions Explained

  • The colon Kima is characterized by thick walls and corners, long living cells with thick cell walls and minimal intercellular space, found in climbers, providing flexibility and mechanical support to plants.
  • Colon Kima's unique feature is its thick corners, crucial for flexibility in plants.
  • Scaren Kima consists of dead cells with thick lignified cell walls and a narrow lumen, found in hard seed structures and vascular bundles, providing mechanical support and seed covering.
  • Lignin surrounds Scaren Kima cells, giving them a cemented structure.
  • Protective tissues like leaf epidermis have a waxy cuticle preventing water loss and invasion, with stomata facilitating gas exchange and water vapor loss.
  • Root epidermis contains root hairs aiding water absorption.
  • Cork cells have suberin, creating a tough covering that reduces gas and water exchange, making them impermeable.
  • Xylem transports water and minerals unidirectionally from roots to plant parts, with components like tracheids, vessels, parenchyma, and fibers.
  • Phloem transports food bidirectionally, with sieve tubes, companion cells, parenchyma, and fibers as components.
  • Epithelial tissues like squamous, cuboidal, stratified, and ciliated/glandular epithelium serve protective, secretory, and absorptive functions in different body parts.

33:39

Tissue Types and Functions in Anatomy

  • Cilia are hair-like structures present in the oviduct and trachea, aiding in movement.
  • Glandular epithelium secretes substances like enzymes, acting as glands in the stomach and intestine.
  • Villi are finger-like projections in the small intestine for absorption, while cilia aid in substance movement.
  • Epithelial tissues include goblet cells in the stomach for secretion.
  • Making tables or columns in textbooks aids in learning tissue locations and functions.
  • Muscular tissues include skeletal, smooth, and cardiac muscles, each with distinct functions.
  • Skeletal muscles are voluntary, aiding in body movement and attached to the skeleton.
  • Smooth muscles are involuntary, found in the esophagus and intestines for movement.
  • Cardiac muscles are involuntary, present only in the heart for continuous pumping.
  • Connective tissues like loose, adipose, and dense tissues provide support, insulation, and structure in the body.

50:34

"Anatomy essentials: Neurons, lymph, ligaments, cartilage"

  • Neurons consist of dendrites that receive information, a cell body or cyton, an axon through which the electrical impulse passes, and an axon terminal where the impulse moves to the next neuron through a synapse.
  • Lymph is a fluid derived from blood capillaries, forming tissue fluid without red blood cells or platelets but containing white blood cells and plasma, constituting the lymphatic system.
  • Ligaments join bones together, providing elasticity and aiding movement, while cartilage cushions between bones, with blood being essential for tissues to receive nutrients, oxygen, and eliminate waste.
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