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The usual form of phloem is
Option: 1
Present outside the xylem
Option: 2
Present inside the xylem
Option: 3
Present within the xylem
Option: 4
All of these
Answers (1)
Complex Permanent Tissues - Phloem (Bast)
- The term ‘phloem’ was given by Nageli.
- Phloem is responsible for transportation of food from source to sink.
- The organ where food is synthesised or stored is called source. Leaves act as a sink for a considerable period. In some plants, the roots act as sink during autumn period.
- The organ where food is utilized, such as roots, flowers, fruits, branches, etc. are called sink.
- On the basis of position, the phloem is of two types:
- External phloem: It is the usual phloem present outside the xylem.
- Internal or intraxylary phloem: It is present internal to the xylem. It is seen in the members of Apocynaceae, Asclepiadaceae, Convolvulaceae, Solanaceae.
- Induced or Interxylary phloem: It is the secondary phloem that occurs in patches within the secondary xylem. For example, Leptadaenia, Salvadora, Chenopodium, Boerhaavia, Amaranthus.
-
External phloem is the usual phloem present outside the xylem.
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