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Secondary growth in pteridophytes is absent due to the
Option: 1
Absence of cambium
Option: 2
Presence of cambium
Option: 3
Presence of cellulosic cell wall
Option: 4
All of these
Answers (1)
Pteridophyta -
- Pteridophytes are first vascular and successful terrestrial plants with true roots, stem and leaves but no flowers, fruits and seeds.
- These plants are mostly found in cool, damp, shady places. Some may also be found in sandy-soil conditions.
- The dominant stage in the life cycle of pteridophytes is sporophyte. It possesses roots, stem and leaves.
- The sporophyte of pteridophytes possesses vascular tissue i.e. xylem and phloem.
- In xylem, true vessels are absent but tracheids are found.
- In phloem, companion cells and sieve tubes are absent, however, sieve cells are present.
- The leaves in pteridophytes can be of two types i.e. they can be small, microphyllous without leaf gaps as in Selaginella and Lycopodium or they can be large macrophyllus as in Ferns like Dryopteris.
Cambium is the secondary meristem required for the secondary growth.
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