Tissues Class 9 Important Questions | Free PDF Download

The "Tissues" chapter of Class 9 Science is an important chapter of biology. It provides a foundation for understanding the cellular structure of plants and animals and how these structures work together to form tissues and organs. The concept of tissue is very important for explaining many biological processes such as growth, repair, and reproduction. It attempts to guide students with relevant questions and answers from Chapter 6 on Tissues during exam time.

Class 9 Tissues Important Questions contains various topics that are asked every year in final examinations. In this chapter, you will understand about the various types of tissues. Tissues are groups of cells having similar structures and functions.

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Overview of the Chapter: Tissues

Tissue is a collection of cells that perform specific functions in the body. In general, the chapter can be broadly divided into two categories, such as plant tissues and animal tissues. The classification of the tissue in plants is sub- divided into meristematic and permanent tissues, while those of animals are classified as epithelial, connective, muscular, and nervous.

Important Points to be Covered:

Plant Tissues: Meristematic and Permanent Tissues.

Animal Tissues: Epithelial, Connective, Muscular, and Nervous Tissues.

Important Questions from the Tissue Chapter

Some of the most important questions from Chapter 6 Tissues are as follows:

What are the different types of Plant Tissues?

Plant tissues are classified into:

Meristematic Tissues: These cells are actively divided and involved in growth. These occur at the tips of the roots and shoots (apical meristems), at the bases of leaves (intercalary meristems), and within the cambium layer (lateral meristems).

Permanent Tissues: These are differentiated cells that have stopped dividing. Permanent tissues are classified into:

(i) Simple Permanent Tissues: Composed of homogenous cell types. Some of the examples include:

• Parenchyma: Involved in storing, photosynthesis, and respiration.
• Collenchyma: Provides support, especially in the developing regions of a plant.
• Sclerenchyma: Rigid and tough due to thick, lignified walls.

(ii) Complex permanent tissues: composed of a variety of cell types that work together, such as,

1. Xylem- the transport tissue concerned with carrying out water and mineral salts from roots to the entire plant
2. Phloem- the food (primarily sugar) transporting tissue from the leaf to other plant parts.

What are the Types of Animal Tissues?Animal tissues are broadly classified into four major types:Epithelial Tissue: It covers the body surface and lines the cavity inside the body. Epithelial performs important roles in protection, secretion, absorption, and filtration. Examples include skin epithelium, ciliated epithelium, and glandular epithelium.Connective Tissue: This tissue provides support and connects various tissues that perform a transport function. Examples include blood, bone, cartilage, and adipose tissue.Muscular Tissue: It is the type responsible for movement and has three different varieties:

• Skeletal Muscles: These are the voluntary muscles attached to the bones.
• Smooth Muscles: These are involuntary muscles located in the walls of internal organs.
• Cardiac Muscles: These are involuntary muscles of the heart.

Nervous tissue consists of nerves, which transmit electrical signals in the body to enable different structures to communicate through impulses, composed of neurons and glial cells.

Explain the Role of Meristematic Tissue in Plants.

Meristematic tissue is crucial in the growth of a plant. It includes undifferentiated cells which are capable of dividing rapidly. There are three major types of meristems:

(i) Apical Meristem: It is present at the root tips and shoot tips, and its function is to make the plant elongate.

(ii) Lateral Meristem: It is located in the cambium and is involved in the thickening, or secondary growth, of stems and roots.

(iii) Intercalary meristem: This is found at the base of leaves or internodes and contributes to the growth of leaves and shoots.

Differentiate between Xylem and Phloem.

Xylem: Transports water and minerals from the roots to different parts of the plant. It consists of vessels, tracheids, xylem fibres, and xylem parenchyma.

Phloem: Transports food (mainly sugars) produced in the leaves to other parts of the plant. It comprises sieve tubes, companion cells, phloem fibres, and phloem parenchyma.

What is the Structure of a Neuron?

A neuron is made up of three primary components:

(i)Cell Body (Soma): It contains the nucleus and cytoplasm.

(ii) Dendrites: These are branch-like structures that collect electrical signals from neighbouring neurons.

(iii) Axon: This is a long fibre that carries electrical impulses away from the cell body to other neurons or muscles.

What is the Difference between Parenchyma, Collenchyma, and Sclerenchyma?

Parenchyma: A simple tissue making up most of the non-woody parts of plants. This tissue plays an important role in photosynthesis, storage, and gas exchange.

Collenchyma: It provides structural support, mainly at the growing parts of the plant. The walls of the cells are unevenly thickened.

Sclerenchyma: This tissue provides strength to plants. The cells have thick, lignified walls and are usually dead when mature.

How do Animal and Plant Tissues Differ in Their Structure and Function?

Structure: Plant tissues are presented along specific growth regions, especially in the meristematic tissues, while permanent tissues are specialized for various functions such as support, transport, and storage. Animal tissues, on the other hand, are more specialized for functions such as movement, communication, and protection, with various structures that fulfill these requirements.

Function: Plant tissues are primarily used for growth, photosynthesis, water transport, and structural support, while animal tissues are used for functions like movement, protection, communication, and nutrient transportation.

Describe the Function of Connective Tissue in Animals.

Connective tissue provides support and binding and connects many organs and tissues in the body. It is not only structural but also allows the transportation of nutrients and wastes. The classifications of connective tissue are:

(i)Loose Connective Tissue: Connects the skin to muscles and organs.

(ii) Fibrous Connective Tissue: Provides strength and flexibility.

(iii) Bone: A structural support. It also is a home for blood cells.

(iv) Blood: Carries gases, nutrients, and wastes throughout the body.

(v) Cartilage: A flexible but supportive cushion.

What are the Characteristics of Epidermal Tissue in Plants?

It is the outermost layer of cells in the plant and carries out the vital function of protecting it from mechanical injuries and loss of water. Typically, it forms a waxy coating known as the cuticle, which reduces water loss. In addition, in some cases, the epidermal tissue may also contain specialized structures called stomata in certain plants for gas exchange.

What are the Different Types of Epithelial Tissues in Animals?

Epithelial tissue is classified based on the number of cell layers and shape. The primary types are:

(i)Simple Epithelium: It is a single layer of cells responsible for absorption, secretion, and filtration.

(ii) Stratified Epithelium: It consists of many layers of cells, but the prime function is protection.

(iii) Cuboidal Epithelium: The cube-shaped structure of cells is characteristic of cuboidal epithelium, which is usually found in glands and ducts.

(iv) Columnar Epithelium: The epithelium of tall cells. It lines most of the digestive tract.

(v) Ciliated Epithelium: Epithelium having cilia, which helps in the movement of particles; found primarily lining the respiratory tract.

The chapter on tissues is important in understanding the structure and function of both plants and animals. It is very important to understand the various types of tissue of the plant and the animal, their specific roles and characteristics, to understand how organisms function at cellular as well as systemic levels. This knowledge not only helps in exam preparation but also creates a solid foundation in biology. Students need to learn all of these basic concepts to understand the rest of the complex topics in the life sciences. So, when the students learn all these important Class 9 tissue questions, they score well in the exams.

We hope that you practice the above Tissues Class 9 Extra Questions with Answers and achieve your dream marks.

All the Best!