The secondary wood of Pinus is characterised by [MP PMT 1993]
A) Presence of resin cells
B) Presence of resin ducts
C) Absence of resin ducts
D) Presence of vessels
Answers
● The secondary wood of pinus is characterised by the presence of resin ducts.
● The secondary wood of Pinus is portrayed by the arrangement of Resin (Terpentine oil).
● In Pinus roots, stem and needle, pitch channels called as resin ducts are found having smelly oil known as resin.
● This resin is anticoagulant and don't permit to freeze water even upto-30∘C temperature in Pinus plants.
The secondary wood of Pinus is characterised by presence of resin ducts.
Option B
Explanation:
Resin is a phenolic compound that is found as an alkaloid in plants like pine. This resin is stored in resin ducts in the pine plants. Resin is produced in the pine ducts itself. This resin is very helpful in resisting the plants in very cold climates as well as provides immunity against various microbes.
These resin ducts are found in the sapwood of the pine plant. The sapwood is the secondary wood of the plant, that grows mainly in the spring. So its also called the spring wood. This wood has very large xylem and phloem bundles, which contains the resin ducts.
Learn more
Resin duct in pinus stem represent lysoginous cavity or schizogenous cavity
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Resin duct of a gymnospermous stem is an example of [BHU 1999; Pb. PMT 2004]
A) Big vacuole
B) Lysigenous cavity
C) Intercellular space
D) Schizogenous cavity
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