Class IX

Roses can grow successfully if stock and scion are
  1. of related species
  2. of different species
  3. of different groups
  4. of similar class
Simplest form of nutrients are
  1. organic compounds
  2. inorganic nutrients
  3. organic nutrients
  4. organic macromolecules
In willow trees, cotton wool is mostly made of
  1. air ducts
  2. air floats
  3. cellulose
  4. starch
Pneumatophores are the
  1. special spores produced in times of drought
  2. special breathing roots
  3. thick coverings on epidermis of leaves and shoots
  4. types of stomata helping reduce rate of transpiration
. Degenerated protoplasm is found in
  1. xylem vessels
  2. phloem tissues
  3. pits
  4. lumen
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