The cells of a meristematic tissue are characterized by
Thin walls and absence of intercellular spaces
Highly vacuolated cytoplasm
Large -sized nucleus and active cell division
All the above
$I.$ Found only in sporophytic phase of life cycle
$II.$ May contain enzymes that are biologically active
$III.$ Often contain strengthening polymers
Select the correct option for cell wall
For a critical studyof secondary growth in plants, which one of the following pairs is suitable ?
Phloem parenchyma is absent in
Quiescent centre is a