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Tissue and Tissue System — BIO BOTANY STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYTissue and Tissue System5 Marks
Question
Compare the different types of plant tissues.
✓

Answer

DistributionMain functionsNatureCell shapeWall materials
ParenchymaCortex, Pith
medullary rays
and Packing
tissues in vascular
system		Packing tissue, support,
gaseous exchange,
food storage 		LivingUsually IsodiametricMainly
Cellulose and Pectinase

CollenchymaOuter region
of cortex as in angles of stems, mid-rib
of leaves		MechanicalLivingElongated PolygonalMainly Cellulose, Pectin and Hemi-cellulose
Sclerenchyma

(a) Fibre		Outer region of cortex,
pericycle of
stems, vascular
bundles		MechanicalDeadElongated and
Polygonal with
tapering ends		Mainly Lignin
(b) SclereidsCortex, Pith;
Phloem shells
and stones of
fruits and seed
coats		Mechanical

Protection		DeadRoughly
Isodiametric
with much
variation		Mainly lignin
Tracheids and

Vessels		Vascular
System		Translocation
of water and
mineral salts		DeadElongated and
Tubular		Mainly lignin
Phloem Sieve

tubes		Vascular
System		Translocation
of organic
solutes		LivingElongated and

Tubular		Cellulose,
Pectir and
Hemicellulose
Companion

Cells		Vascular
System		Work in
association
with sieve
tubes		LivingElongated and
narrow		Cellulose,
Pectin and
Hemicellulose

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