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Explain the difference between thorns, spines, and prickles.?
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Answer Posted / kushagra chaturvedi
Thorns Spines and Prickles have only one thing in common
viz. they are all very sharp pointed and helpful as a
defense mechanism.
Now let us see the differences ( All Botanical)
1) Spines = these are all modified LEAVES; i.e. the leaves
are turned in to or reduced to spines. Very good example is
Cactus. In all cacti the stem does the function of
photosynthesis (Phylloclade) and the leaves are turned in
to spines to reduce the rate of transpiration and also act
as defense mechanism against animals.They are seen at the
node where a leaf is expected
2) Thorns = These are all modified branches ( i.e. stem
modification). They either develop from terminal or
axillary buds.. They are also used for defense.They are
seen only at the node of the plant.They are endogenous in
origin i.e. from the vascular tissue.Examples are
Pomegranate, Bougainvillea
3) Prickles = These are NOT modifications of any existing
organ of a plant. They are entirely new organs ( "Organa de
novo" as said in Latin).They are found any where and
indiscriminately on the plant( Stem , leaves ) . They are
exogenous in origin ( develop from epidermal tissue only).
Therefore they break off easily. Rose is an excellent
example.
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