Tissue Class 9 Science 20 Important Questions with answer

20 important questions with answers on the chapter "Tissues" from Class 9 Science:

1. What are tissues?

   • Answer: Tissues are groups of cells with similar structure and function working together to perform a specific activity. They are classified into four main types: epithelial, connective, muscular, and nervous tissues.

2. What are the main types of plant tissues?

   • Answer: The main types of plant tissues are:
     • Meristematic Tissue: Responsible for growth and is found in regions like the tips of roots and shoots.
     • Permanent Tissue: Includes:
       • Simple Tissue: Such as parenchyma, collenchyma, and sclerenchyma.
       • Complex Tissue: Includes xylem and phloem.

3. What is meristematic tissue?

   • Answer: Meristematic tissue consists of actively dividing cells that are responsible for the growth of plants. They are found in growth regions like the tips of roots and shoots.

4. What are the types of simple permanent tissues in plants?

   • Answer: The types of simple permanent tissues are:
     • Parenchyma: Provides support and stores nutrients.
     • Collenchyma: Provides flexible support and strength.
     • Sclerenchyma: Provides rigid support and strength with thick cell walls.

5. What is the function of xylem?

   • Answer: Xylem is responsible for the transport of water and minerals from the roots to other parts of the plant. It also provides mechanical support.

6. What is the function of phloem?

   • Answer: Phloem transports the products of photosynthesis, such as sugars, from the leaves to other parts of the plant.

7. What are the types of connective tissues in animals?

   • Answer: The types of connective tissues are:
     • Loose Connective Tissue: Includes areolar, adipose, and reticular tissues.
     • Dense Connective Tissue: Includes tendons and ligaments.
     • Cartilage: Provides flexible support.
     • Bone: Provides rigid support.
     • Blood: Transports nutrients, gases, and wastes.

8. What is the difference between parenchyma and sclerenchyma?

   • Answer: Parenchyma has thin cell walls and is involved in storage and metabolism. Sclerenchyma has thick, lignified cell walls and provides structural support and strength.

9. What is the role of collenchyma in plants?

   • Answer: Collenchyma provides flexible support and helps in the growth of plant organs. It is found in regions of the plant that are still growing.

10. How does the structure of xylem support its function?

    • Answer: Xylem has long, hollow cells (vessels and tracheids) that facilitate the easy flow of water. The lignin in its cell walls provides structural support to withstand the negative pressure generated during water transport.

11. What are the four types of animal tissues?

    • Answer: The four types of animal tissues are:
      • Epithelial Tissue: Covers body surfaces and organs.
      • Connective Tissue: Provides support and binds other tissues.
      • Muscular Tissue: Facilitates movement.
      • Nervous Tissue: Transmits nerve impulses and controls body functions.

12. Describe the structure and function of epithelial tissue.

    • Answer: Epithelial tissue is composed of closely packed cells forming continuous layers. It serves as a protective barrier, absorbs nutrients (in the intestines), secretes substances (like hormones), and aids in sensation.

13. What is the function of adipose tissue?

    • Answer: Adipose tissue stores fat for energy, provides insulation to maintain body temperature, and cushions and protects organs.

14. Explain the difference between skeletal and smooth muscle tissues.

    • Answer: Skeletal muscle tissue is striated and voluntary, responsible for body movement. Smooth muscle tissue is non-striated and involuntary, found in walls of internal organs and aiding in their function.

15. What is the main role of nervous tissue?

    • Answer: Nervous tissue is responsible for receiving stimuli, processing information, and transmitting nerve impulses to coordinate body functions and responses.

16. What is sclerenchyma and where is it found?

    • Answer: Sclerenchyma is a type of plant tissue with thick, lignified cell walls that provide mechanical support and strength. It is found in parts of the plant that have ceased growing, such as stems and branches.

17. What are the two main types of xylem cells?

    • Answer: The two main types of xylem cells are:
      • Tracheids: Elongated cells with tapered ends, aiding in water transport.
      • Vessels: Short, wide tubes with perforated end walls, providing efficient water transport.

18. How does the structure of phloem support its function?

    • Answer: Phloem consists of sieve tube elements and companion cells. Sieve tubes have pores that allow the flow of nutrients, while companion cells provide metabolic support to the sieve tubes.

19. What is the function of reticular connective tissue?

    • Answer: Reticular connective tissue forms a supportive framework for organs like the liver, spleen, and lymph nodes, providing structural support.

20. Explain the difference between simple and complex tissues in plants.

    • Answer: Simple tissues consist of only one type of cell, such as parenchyma, collenchyma, and sclerenchyma. Complex tissues are made up of more than one type of cell working together, like xylem and phloem, which perform specific functions like transport and support.

These questions cover a broad range of key concepts related to tissues in both plants and animals.