19 Questions
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.
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.
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.
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.
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.
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.
Where is apical meristem found?
The apical meristem is found at the apex (growing tips) of the stem and roots.
Which tissue makes up the husk of coconut?
Sclerenchymatous tissue.
What are the constituents of phloem?
The constituents of phloem are: sieve tubes, companion cells, phloem parenchyma, phloem fibres(bast).
Name the tissue responsible for movement in our body.
Muscle/muscular tissue.
Vertical growth in plants takes place by –
Apical meristem
Which of these components of blood fight infection?
WBC
In desert plants, rate of water loss gets reduced due to presence of:
Cuticle
Cartilage is not found in –
Kidney
Which of these types of cells is most likely to divide?
Meristem
Companion cells are associated with –
Sieve tubes
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
- Simple tissues:
- 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
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.
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