Lesson 3 ·Class 9 · Tissues : Plant and Animal Tissues · Sort Lab
Permanent Plant Tissues
Packing, flexible support, and rigid strength.
Sort each feature into the simple permanent tissue it describes.
Sorted 0/9
All items sorted — check each bin.
Free play — sort every item into the bin it belongs in; each correct drop tells you why. Switch to when you're ready to test yourself.
Thin walls = parenchyma. Corner thickening = collenchyma. Lignin and dead cells = sclerenchyma.
What this lesson covers
Challenges to clear
- Fill the Sclerenchyma bin correctly.
- Sort every feature.
- Fill the Parenchyma box — the soft, living, all-purpose packing tissue.
The task
Sort each feature into the simple permanent tissue it describes.
What this lesson covers
- Parenchyma — Thin-walled packing tissue: Thin cellulose walls with large spaces between cells (Loosely packed, which is why gases move through it easily.); Stores food and water (The commonest plant tissue — it fills most of the soft parts.); With chloroplasts it becomes chlorenchyma and photosynthesises (The mesophyll of a leaf is parenchyma with chloroplasts.)
- Collenchyma — Flexible support: Walls thickened at the corners with pectin (The corner thickening is its identifying feature.); Gives support while still allowing bending (A young stem sways in wind instead of snapping.); Found in leaf stalks and young stems (Exactly where flexible strength is needed.)
- Sclerenchyma — Rigid strength: Walls heavily thickened with lignin (Lignin is what makes wood hard.); The cells are dead at maturity (Only the thick wall is left, and that is what does the job.); Makes coconut husk and nut shells tough (Sclereids and fibres give hardness and rigidity.)
Hint
Thin walls = parenchyma. Corner thickening = collenchyma. Lignin and dead cells = sclerenchyma.