Viral infection is usually absent in
Phloem cells
Xylem cells
Pith cells
Apical meristem
Which of the following shows correct chronological order of the events occurring during callus culture?
Healing of wound in plants takes place by the activity of
Which of the following are fused in somatic hybridization involving two varieties of plants?
The nutrient medium for tissue culture should have
$I.$ Sucrose
$II.$ Inorganic Salts
$III.$ Amino acids
$IV.$ Vitamins
Damaged sieve tubes are sealed by deposition of