CBSE Class 9 Science Chapter 6: Tissues NCERT Solutions

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NCERT Solutions PDF Class 9 PDF

CBSE Class 9 Science Chapter 6: Tissues introduces the essential concept of tissues in living beings. It defines tissues and explains their importance in multicellular organisms through the division of labor. The chapter details plant tissues, categorizing them into simple tissues like parenchyma, collenchyma, and sclerenchyma, and complex tissues such as xylem and phloem, along with their functions and locations. It also covers animal tissues, including epithelial, connective, muscular, and nervous tissues, describing their structures and roles. Grasping these tissue types is vital for understanding how plants and animals are organized and function. The provided solutions offer clear, step-by-step explanations to help students understand these biological concepts, supporting exam preparation and building a solid biology foundation.

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Quick info

BoardCBSE
ClassClass 9
SubjectScience
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 6: Tissues

Chapter summary

Chapter 6, 'Tissues,' for Class 9 Science NCERT Solutions focuses on the cellular organization in multicellular organisms. It defines tissues and explains their importance through the concept of division of labor. The solutions cover the classification and functions of simple and complex plant tissues, including meristematic and permanent tissues. It also details the four main types of animal tissues: epithelial, connective, muscular, and nervous tissues, explaining their structures and roles. This chapter is key to understanding how different parts of plants and animals are structured and function.

Learning outcomes

  • Define the term 'tissue' and explain its role in multicellular organisms.
  • Differentiate between simple and complex plant tissues.
  • Identify the types and functions of various plant tissues like parenchyma, collenchyma, sclerenchyma, xylem, and phloem.
  • Describe the four main types of animal tissues: epithelial, connective, muscular, and nervous.
  • Explain the concept of division of labor in multicellular organisms.
  • Locate specific tissues like apical meristem and sclerenchyma in plants.

Topics covered

Paper topics

  • Definition of Tissue
  • Utility of Tissues in Multicellular Organisms
  • Division of Labor
  • Types of Plant Tissues
  • Simple Tissues (Parenchyma, Collenchyma, Sclerenchyma)
  • Meristematic Tissues (Apical Meristem)
  • Complex Tissues (Phloem)
  • Components of Phloem
  • Animal Tissues (General Introduction)
  • Epithelial Tissue
  • Connective Tissue
  • Muscular Tissue
  • Nervous Tissue

Important topics

  • Definition and Utility of Tissues
  • Simple Plant Tissues: Parenchyma, Collenchyma, Sclerenchyma
  • Meristematic Tissue: Apical Meristem
  • Complex Plant Tissue: Phloem and its Components
  • Types of Animal Tissues

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Questions and Solutions

Question 1

What is a tissue?
Solution: A tissue is a fundamental level of organization in multicellular organisms. It is defined as a group of cells that are structurally similar and are organized together to perform a specific function or a set of related functions. For example, muscle cells form muscle tissue responsible for movement.

Question 2

What is the utility of tissues in multi-cellular organisms?
Solution: In single-celled (unicellular) organisms, one cell carries out all essential life processes like nutrition, respiration, excretion, and movement. However, in multicellular organisms, there is a specialization of cells. Cells are grouped together to form tissues, and each tissue is specialized to perform a particular function efficiently. This arrangement, known as the division of labor, allows multicellular organisms to carry out complex functions with greater speed and efficiency. For instance, muscle tissues are specialized for movement, and nerve tissues are specialized for transmitting signals, enabling the organism to function effectively.

Question 1

Name types of simple tissues.
Solution: Simple permanent tissues in plants are those tissues in which all the cells are structurally and functionally similar. They are composed of only one type of cell. The three types of simple permanent tissues are:
  1. Parenchyma: Involved in storage, photosynthesis, and secretion. It can be further specialized into Aerenchyma (for buoyancy in aquatic plants) and Chlorenchyma (containing chlorophyll for photosynthesis).
  2. Collenchyma: Provides mechanical support and flexibility, especially in growing stems and leaves. Its cells have unevenly thickened cell walls.
  3. Sclerenchyma: Provides strength and rigidity to plant parts. Its cells have uniformly thickened, lignified cell walls and are often dead at maturity.

Question 2

Where is apical meristem found?
Solution: Apical meristem is a type of actively dividing plant tissue found at the apex, or tip, of the plant's primary growth points. Specifically, it is located at the growing tips of roots and shoots (stems and leaves). The primary function of apical meristem is to initiate the formation of new cells, leading to the increase in length of the plant body, a process known as primary growth.

Question 3

Which tissue makes up the husk of coconut?
Solution: The tough and fibrous husk of a coconut is primarily made up of sclerenchyma tissue. The cells of sclerenchyma are characterized by their thick, lignified secondary walls, which provide considerable strength and rigidity, making them suitable for protective and supportive functions like forming the husk.

Question 4

What are the constituents of phloem?
Solution: Phloem is one of the two types of complex permanent tissues in plants, responsible for the translocation of food (sugars produced during photosynthesis) from the leaves to other parts of the plant. It is composed of four distinct types of cells or elements:
  1. Sieve tubes: These are elongated, tubular cells that are the main conducting channels for food.
  2. Companion cells: These cells are closely associated with sieve tubes and play a vital role in loading and unloading sugars into the sieve tubes.
  3. Phloem parenchyma: These parenchyma cells store food materials and help in the lateral movement of food.
  4. Phloem fibres: These are sclerenchymatous cells that provide mechanical support to the phloem tissue.

Common mistakes

  • Confusing simple and complex plant tissues.
  • Misidentifying the location or function of specific tissues.
  • Not fully explaining the concept of division of labor.
  • Overlooking the components of phloem or xylem.

Revision tips

  • Create flashcards for different tissue types, their locations, and functions.
  • Draw diagrams of plant and animal tissues and label their parts.
  • Focus on understanding the 'division of labor' concept and its importance.
  • Review the specific examples given for each tissue type in the solutions.

Practice MCQs

Q1. What is the primary function of apical meristem?

Q2. Which type of simple tissue makes up the protective husk of a coconut?

Q3. Which of the following is NOT a constituent of phloem?

Q4. What is the main utility of tissues in multicellular organisms?

Frequently asked questions

What is a tissue in biology?

A tissue is defined as a group of similar cells, along with their intercellular substances, that are organized together to perform a specific function.

Why are tissues important for multicellular organisms?

Tissues are important because they allow for a division of labor, where different groups of cells specialize in performing specific functions, leading to greater efficiency in the organism's overall functioning.

What are the main types of simple tissues found in plants?

The main types of simple permanent tissues in plants are Parenchyma, Collenchyma, and Sclerenchyma.

Where is the apical meristem located in plants?

Apical meristem is found at the actively growing tips of the plant's stems and roots.

What are the four components that make up the phloem tissue?

The four components of phloem are sieve tubes, companion cells, phloem parenchyma, and phloem fibres.

How do these NCERT Solutions help Class 9 students?

These solutions provide clear, step-by-step explanations for each question in Chapter 6, helping students understand the concepts of tissues and their functions in plants and animals for better exam preparation.

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