Class 9 Science Tissue Extra Question Answer
1. What is a tissue?
A tissue is a group of cells that are similar in structure and function, working together to perform a specific activity.
2. What is the main difference between unicellular and multicellular organisms regarding tissues?
Unicellular organisms perform all functions within a single cell, while multicellular organisms have specialized groups of cells forming tissues for efficient functioning.
3. What are the two main types of plant tissues?
Plant tissues are classified into meristematic tissue, which divides throughout the plant’s life, and permanent tissue, which does not divide and is specialized for different functions.
4. What is meristematic tissue?
Meristematic tissue consists of actively dividing cells, located in specific areas of the plant, contributing to growth.
5. What are permanent tissues?
Permanent tissues develop from meristematic tissues after losing their ability to divide and can be classified into simple and complex tissues.
6. Provide examples of simple permanent tissues.
Simple permanent tissues include parenchyma, collenchyma, and sclerenchyma, which consist of similar types of cells.
7. What is sclerenchyma tissue?
Sclerenchyma is a type of plant tissue that provides strength and stiffness; its cells are dead and have thickened walls rich in lignin.
8. What are complex tissues in plants?
Complex tissues, such as xylem and phloem, are made up of more than one type of cell working together to perform common functions like transport.
9. What role does xylem play in plants?
Xylem transports water and minerals from the roots to other parts of the plant and provides structural support.
10. Describe the function of phloem.
Phloem transports nutrients, primarily food produced by photosynthesis, from leaves to other parts of the plant.
11. How do animal tissues differ from plant tissues?
Animal tissues are more diverse and include epithelial, connective, muscular, and nervous tissues, reflecting their mobile and complex structure compared to plants.
12. What is the primary role of epithelial tissue?
Epithelial tissue protects surfaces, forms barriers, and is involved in absorption, secretion, and sensation.
13. What is muscular tissue responsible for?
Muscular tissue consists of cells that can contract and relax, allowing movement of the body and its parts.
