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Which are plant tissues that form the plant roots?
Roots have a central portion called medulla made of vascular tissue outer phloem and inner xylem. Medulla is delimited by pericycle and surrounded by the medullary parenchyma, a meristem that originates the secondary roots (ramifications). Externally to medulla lies the cortical portion formed of endodermis that surrounds the pericycle and cortical parenchyma. The covering of roots is epidermis with root hairs later substituted by suberized (corky) periderm.
How are secondary cell walls different from primary cell walls? Primary cell walls are assembled on the surface of the plasma membrane whereas the cell is growing. They can gro
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(i) Area uses or permit exposure to radiation should be Marked' Restricted Area 'or Radiation zone etc. (ii) Avoid x-rays of chest and lower back in routine physic
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