Worksheets › Class 9 › Tissues in Action › Cheat sheet
Class 9 Tissues in Action: cheat sheet
CBSE Science. A tissue is a group of similar cells doing one job. Plants have meristematic and permanent tissues; animals have epithelial, connective, muscular and nervous tissue.
Key ideas
- Meristematic tissue keeps dividing: apical (tips, length), lateral (sides, girth) and intercalary (base of leaves, grasses).
- Simple permanent tissues: parenchyma (stores food), collenchyma (flexibility), sclerenchyma (hard, dead cells with lignin).
- Xylem carries water and minerals up; phloem carries food both ways.
- Epithelium covers and lines organs: squamous (blood vessels, skin), cuboidal (kidney tubules), columnar, ciliated (windpipe).
- Muscles: striated (voluntary, on bones), smooth (involuntary, gut and blood vessels), cardiac (heart, never tires).
- A neuron has a cell body, dendrites and a long axon; it carries messages as electrical signals.
Remember
| Tendon | joins muscle to bone (strong, little stretch) |
| Ligament | joins bone to bone (elastic) |
| Blood | plasma + red cells (oxygen) + white cells (defence) + platelets (clotting) |
| Cork and epidermis | protective tissues; cork walls have suberin |
Watch out
- Mixing up tendons and ligaments.
- Calling xylem vessels living cells (mature vessels are dead tubes).
- Saying cardiac muscle is voluntary.
Worked example
Say whether each is a plant or an animal tissue, and name its kind: smooth muscle; nervous tissue; epidermis; cork.
Working: plant tissues are meristematic, simple permanent, complex permanent or protective; animal tissues are epithelial, connective, muscular or nervous
Answer: smooth muscle: animal, muscular; nervous tissue: animal, nervous; epidermis: plant, protective; cork: plant, protective
Practise Tissues in Action
Revise with this page, then practise: every Tissues in Action sheet in the app is new, with an answer key and working.
Coming soon for Android and iPhone.