Whar are the types of venation??
Answers
Answer:
Venation is the phenomenon of arrangement of veins in the lamina of the leaf surface. It is of three types, reticulate, parallel and furcate venation. In reticulate venation, veins form the network like structure. For example, leaves of dicot plants
Explanation:
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Answer:
The arrangement of veins on leaf blade is called venation. In angiosperm there are two types of venation.
1.Reticulate venation- is net like pattern of arrangement of veins. Eg- Rose,Tulsi, Maple etc.
It is further divided into type
a.Unicostate or Pinnate Reticulate- in this leafs having a single main mid- rib. Eg- Hibiscus.
b.Multicostate or Palmate Reticulate- in this type leafs having two or more mid - ribs arising from a single point . And it is further divided into:-
●Multicostate convergent- leafs have many mid-ribs in a curved fashion from base of blade to its apex. Eg- beri.
●Multicostate divergent- leafs having many mid-ribs arise at the base of the leaf and then diverge from one another towards the margin.Eg- papaya.
2. Parallel venation- in this smaller veins are running parallel to each other. Eg- Banana,palm, onion etc.
Parallel venation is also divided into two types
a.Unicostate or Pinnate parallel- in this lamina has a single prominent midrib from which lateral veins arise which run towards the margin.Eg- Banana.
b.Multicostate or Palmate parallel-in this type several leaves run parallel to each other.
And it is further divided as:
●Multicostate convergent-in this type principal veins appear from the base of the lamina and converge at the apex.Eg- Bamboo.
●Multicostate divergent- in this type main veins of leaf appear from the base of the lamina and converge at the apex.Eg- Fan palm.
Hope this will help .
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