Class XI

In dicot stems, the cells of cambium present between primary xylem and primary phloem is
  1. Interfascicular cambium
  2. Intrafascicular cambium
  3. Vascular cambium
  4. Medullary cells
Tyloses are balloon-like ingrowths in vessels developing from
  1. Fibres through general surface of vessel wall
  2. Parenchyma through the pits of vessels wall
  3. Fibre through pits on vessels wall
  4. Parenchyma through general surface of vessel wall
In monocotyledons, guard cell of stomata are
  1. Bi-concave shaped
  2. Dumb-bell shaped
  3. Bean-shaped
  4. Biconvex shaped
The vascular bundles are closed when they
  1. Have cambium
  2. Lack cambium
  3. Lack pericycle
  4. Have pericycle
Lacunate collenchyma occurs in stem of
  1. Leucas
  2. Cucurbita
  3. Sunflower
  4. Sambucus
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