CBSE Class 9 Science: Tissues Chapter 6 Important Questions

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Questions and Answers

What are the functions of areolar tissue?

To fill the space inside organs, to help in repair and maintenance of nearby tissues/organs, and to support and prevent injuries to internal organs.

What are the major functions of blood?

The major functions of blood are to transport food materials, oxygen, carbon dioxide, excretory products, regulate temperature, protect from disease, and help in wound healing.

How many types of tissues are found in animals? Name them.

Four types of tissues are found in animals - Epithelium or Epithelial tissue, Connective tissue, Muscular tissue, and Nervous tissue.

Explain the main functions of epidermis, cork, and stomata.

Epidermis provides protection and forms a waterproof coating, stomata aid in gas exchange, and cork prevents desiccation and infection. Signup and view all the answers

What are the characteristic features of connective tissue?

Connective tissue has living cells embedded in a non-living matrix, thick fibers, binds other tissues, and provides rigidity and support. Signup and view all the answers

Why is epidermis important for plants?

The epidermis is important for plants as it provides a protective outer covering, reduces water loss with a cuticle, and aids in gas exchange through stomata. Signup and view all the answers

Describe the different types of meristems.

Apical meristems increase plant length, lateral meristems increase width or girth, and intercalary meristems increase internode length in monocots. Signup and view all the answers

How does cardiac muscle differ from voluntary and involuntary muscles in terms of structure and function?

Cardiac muscles are involuntary, have branching fibers with centrally located nuclei, contain intercalated discs, and function throughout life. Signup and view all the answers

Explain why water vapors appear on the wall of a glass jar when a potted plant is covered with it.

Water vapors appear due to transpiration from the plant's leaves, which leads to water loss and condensation on the glass surface. Signup and view all the answers

Where is apical meristem found?

The apical meristem is found at the apex (growing tips) of the stem and roots. Signup and view all the answers

Which tissue makes up the husk of coconut?

Sclerenchymatous tissue. Signup and view all the answers

What are the constituents of phloem?

The constituents of phloem are: sieve tubes, companion cells, phloem parenchyma, phloem fibres(bast). Signup and view all the answers

Name the tissue responsible for movement in our body.

Muscle/muscular tissue. Signup and view all the answers

Vertical growth in plants takes place by –

Apical meristem Signup and view all the answers

Which of these components of blood fight infection?

WBC Signup and view all the answers

In desert plants, rate of water loss gets reduced due to presence of:

Cuticle Signup and view all the answers

Cartilage is not found in –

Kidney Signup and view all the answers

Which of these types of cells is most likely to divide?

Meristem Signup and view all the answers

Companion cells are associated with –

Sieve tubes Signup and view all the answers

Study Notes

Characteristics of Tissues

A tissue is a group of similar cells that perform a specific function
Tissues are the basic units of organization in living organisms

Types of Tissues

In plants:
- Simple tissues:
  - Parenchyma
  - Collenchyma
  - Sclerenchyma
- Complex tissues:
  - Xylem
  - Phloem
In animals:
- Epithelial tissue
- Connective tissue
- Muscular tissue
- Nervous tissue

Plant Tissues

Apical meristem: found at the tips of roots and shoots, responsible for increase in length
Lateral meristem: found on the sides of roots, stems, and branches, responsible for increase in width or girth
Intercalary meristem: found at the base of internodes in monocots, responsible for increase in length of internodes

Animal Tissues

Epithelial tissue: forms the lining of organs, glands, and other body surfaces
Connective tissue: connects and supports other tissues, forms bones, tendons, and ligaments
Muscular tissue:
- Skeletal muscles: voluntary, striated, and multinucleate
- Smooth muscles: involuntary, non-striated, and uninucleate
- Cardiac muscles: involuntary, striated, and branched
Nervous tissue: receives and transmits stimuli, forms brain, spinal cord, and nerves

Functions of Tissues

Protection: epidermis, cork, and sclerenchyma
Support: collenchyma, sclerenchyma, and bone
Transportation: xylem and phloem
Movement: muscular tissue
Sensation and control: nervous tissue

Meristematic Tissue

Consists of undifferentiated cells that continuously divide to form new cells
Found in apical, lateral, and intercalary regions of plants

Permanent Tissue

Consists of differentiated cells that have lost the ability to divide
Found in various parts of plants and animals

Neuron Structure

Cell body (cyton): contains the nucleus and most of the cell's organelles
Dendrites: short, branched extensions that receive stimuli
Axon: long, single extension that transmits stimuli away from the cell body

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Description

Practice important 1-mark questions on chapter 6 Tissues from CBSE Class 9 Science. Test your knowledge on apical meristem, sclerenchymatous tissue, and phloem constituents.