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- #National Eligibility Cum Entrance Test
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Sphagnum is commonly used as packing material for transhipment of living materials due to its
Option: 1
capacity to hold water
Option: 2
easy availability
Option: 3
nature as it can grow anywhere
Option: 4
all of these
Answers (1)
Bryopsida:
- These are also known as mosses.
- The gametophyte has two stages in the life cycle one is protonema and other is gametophore.
- Protonema is prostate, branched filamentous structure which looks like alga. It is formed from spore.
- Gametophore is adult erect leafy gametophyte that develops from adventitious buds of protonema.
- Rhizoids are multicellular and branched. Scales are absent.
- Gametophore has Stem-like structure called cauloid and leaf-like structures called phyllodes. Phyllodes are arranged in an alternate manner on the stem.
- Vegetative reproduction takes place by fragmentation, gemmae formation and by secondary protonema formed from wounded parts of gametophore.
- Sex organs arise in groups at the apex of the stem and its branches and are interspersed by multicellular, uniseriate green structures called paraphyses.
- The sporophyte is partially parasitic on gametophore and differentiated into foot, seta and capsule.
- Capsule possess peristomial teeth which help in spore dispersal by showing hygroscopic movements. The capsule also possesses columella interior to spore sac.
- Ex: Funaria (Cord moss or Fire moss), Sphagnum (Peat or Bog-moss).
Sphagnum can absorb a good quantity of moisture.
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