Short / Long answer type questions.Differentiate between:(a)Sap wo | Filo
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Class 11

Biology

Plant Physiology

Mineral Nutrition

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Short / Long answer type questions.
Differentiate between:
(a)Sap wood and heartwood, (b) Cork cambium and vascular cambium, (c) Phellem
and phelloderm, (d) Soft wood and hardwood, (e) Fascicular cambium and interfascicular cambium

Solution:
 SapwoodHeartwood 
 Lighter in colourDarker in colour 
 Helps in the conduction of water and minerals from root to leaf in old trees Does not conduct water but gives mechanical support to the stem due to its hard and durable nature
 Cork cambium Vascular cambium
 Develops from secondary lateral meristemDevelops from apical meristem 
 Give rise to bark and secondary cortexGive rise to secondary xylem and phloem 
 Produces the lenticelsProduces the medullary rays 
 Provides protection against the damage and prevents water lossProvides vascular tissues for water and minerals conduction 
 PhellemPhelloderm 
 Called as corkCalled as the secondary cortex 
 Composed of dead cellsComposed of living cells 
 Cells are closely packedCells are densely packed 
 Highly suberizedNot suberized 
 Impermeable to water due to the presence of suberin Permeable to water
 Produced by phellogen towards the outer sideProduced by phellogen towards the inner side 
 SoftwoodHardwood 
 Usually less denseUsually denser 
 They are gymnosperms that remain evergreenThey are angiosperms that come from deciduous trees 
 Examples include: Pine, redwood and larchExamples include: Eucalyptus, beech and Blackwood 
 Fascicular cambium Interfascicular cambium
 The meristematic tissue which develops within the vascular bundles. The meristematic tissue which develops between the vascular bundles.
 It is a primary meristem. It is a secondary meristem.
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