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Anatomy of Flowering Plants — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYAnatomy of Flowering Plants5 Marks
Question
Distinguish between sapwood and heartwood.
✓

Answer

Differences between sapwood and heartwood are:
 
Sapwood
Heartwood
1
It is the outer region of xylem of an old stem.
It is the central part of secondary xylem of an old stem.
2
It is light or pale coloured.
It is dark brown in colour.
3
It contains living xylem parenchyma.
Parenchyma has died down.
4
Tyloses are absent.
Tyloses (sing. tylosis) which are intrusions of parenchyma cells into tracheary elements are present.
5
It is light in weight
It is heavier.
6
It is prone to attack of insects and pathogens.
It is resistant to attack of pathogens and insects.

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