1. Tardigrade
  2. Question
  3. Biology
  4. Fill in the blanks: a. In (1), the protoxylem lies towards the periphery and metaxylem lies towards the centre. Such arrangement of primary xylem is called (2) b. In (3), the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery. This type of primary xylem is called(4)

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Q. Fill in the blanks:
a. In (1)______, the protoxylem lies towards the periphery and metaxylem lies towards the centre. Such arrangement of primary xylem is called (2)______
b. In (3)_______, the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery. This type of primary xylem is called(4)______

Anatomy of Flowering Plants

Solution:

• In roots, the protoxylem lies towards the periphery and metaxylem lies towards the centre. Such arrangement of primary xylem is called exarch.
• In stems, the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery. This type of primary xylem is called endarch.