Higher gymnosperms differ from pteridophytes in having well-defined _____?

اعلی جمناسپرس کو مستحکم _____ میں ٹیریڈوفائیٹس سے مختلف ہے؟

Re-growth

Secondary growth

Primary growth

None of these

Explanation

Higher gymnosperms possess a vascular cambium that produces secondary xylem and phloem, resulting in well-defined secondary growth (wood formation).

Pteridophytes lack this vascular cambium and therefore do not exhibit secondary growth.