Sieve tubes have
Apical and oblique septa
Perforated and longitudinal septa
Perforated and oblique septa
Simple oblique wall
The difference in phloem of gymnosperms and angiosperms is due to
Chloroplast containing parenchyma is called
Aerenchyma is helpful in plants by
Conjuctive tissue is made up of
The xylem fibres are classified into