Question

The reason why the bryophytes remain small whereas pteridophytes can grow to great heights is because in pteridophytes:

• A. Spores get discharged by the hygroscopic annulus
• B. Numerous rhizoids are found
• C. Photosynthesis occurs vigorously
• D. Xylem and phloem are developed

Answer 1

The correct option is D 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.