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Question
When water rises from the rhizoids of Riccia to its assimilatory filaments, it is through
When water rises from the rhizoids of Riccia to its assimilatory filaments, it is through
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Solution
The correct option is A Osmosis
- Riccia is a bryophyte. The bryophytes are small plants, that remain close to the surface of earth. This is because they do not have vascular tissue. Absence of well developed vascular tissue means that water cannot be lifted to great heights. The transpiration pull, capillary and root pressure are the forces important in plants, which have a well developed vascular system like gymnosperms and angiosperms.
- In Riccia cells, rhizoids are living and not free-lumen hollow tubes like xylem vessels or tracheids of higher plants. Hence, capillary action is ruled out. Also when roots are absent, root pressure is out of question. Finally, transpiration pull is also ruled out, because these small plants cannot sustain transpiration. If substantial transpiration occurs the plants itself will get dried up and dessicated and die.
- Riccia is a bryophyte. The bryophytes are small plants, that remain close to the surface of earth. This is because they do not have vascular tissue. Absence of well developed vascular tissue means that water cannot be lifted to great heights. The transpiration pull, capillary and root pressure are the forces important in plants, which have a well developed vascular system like gymnosperms and angiosperms.
- In Riccia cells, rhizoids are living and not free-lumen hollow tubes like xylem vessels or tracheids of higher plants. Hence, capillary action is ruled out. Also when roots are absent, root pressure is out of question. Finally, transpiration pull is also ruled out, because these small plants cannot sustain transpiration. If substantial transpiration occurs the plants itself will get dried up and dessicated and die.
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