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Question

The reason why the bryophytes remain small whereas pteridophytes can grow to great heights is because in pteridophytes:
  1. Photosynthesis occurs vigorously
  2. True xylem and phloem are developed
  3. Spores get discharged by the hygroscopic annulus
  4. Numerous rhizoids are found


Solution

The correct option is B True xylem and phloem are developed
Pteridophytes evolved a system of xylem and phloem to transport fluids and thus achieved greater heights than was possible for their avascular ancestors. This greater height gave them an evolutionary advantage because they were able to disperse spores better, which gives rise to new plants.

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