The sieve tube elements and the companion cells are connected by:
1. sieve pores in their common transverse wall
2. sieve pores in their common longitudinal wall
3. pit fields in their common longitudinal wall
4. pit fields in their common transverse wall
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Common feature in vessel elements and sieve tube elements is
1. Enucleate condition | 2. Presence of P-protein |
3. Thick secondary wall | 4. Pores on lateral walls |