Class XI

Ground tissue consists of
  1. Epidermis and cortex
  2. All tissues external to endodermis
  3. All tissues except epidermis and vascular tissue
  4. All tissues internal to endodermis
Vascular bundles in which cambium is present between xylem and phloem is called as
  1. Collateral
  2. Open
  3. Amphivesal
  4. Closed
The region consisting of dead elements with highly lignified walls is called
  1. Heart wood
  2. Autumn wood
  3. Sap wood
  4. Spring wood
Aerating pores in the bark of plants is known as
  1. None of these
  2. Air pore
  3. Stomata
  4. Lenticels
The shape of guard cells in grasses is
  1. Dumb-bell
  2. Elliptical
  3. Round
  4. Kidney
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