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46. Secondary xylem is formed by
A. Metaxylem
B. Protoxylem
C. Pro cambium
D. Vascular cambium
Explanation:
47. The other name for Stone cells is
A. Companion cells
B. Sieve tube cells
C. Sclereids
D. Tracheids
Explanation:
48. Conduction of water through the vessels and tracheids are assisted by
A. Sclereids
B. Fibres
C. Aerenchyma
D. Xylem parenchyma
Explanation:
49. Selerenchyma fibres are as long as
A. 35 cm
B. 45 cm
C. 55 cm
D. 65 cm
Explanation:
50. The fibres are known as
A. Supporting cells
B. Stone cells
C. Vessels
D. Tracheids
Explanation: