In grasses certain adaxial epidermal cells along the vein modify themselves into large, empty, colourless cells called ________.

  1. Bark
  2. Bulliform cells
  3. Bundle sheath cells
  4. Spongy mesophyll cells
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Bulliform cells help in

  1. Heat resistance
  2. Minimizing water loss
  3. Maintaining ion balance
  4. Mineral acquisition
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The similar size of vascular bundle in monocot leaf is due to

  1. Reticulate venation
  2. Parallel venation
  3. Branched venation
  4. Radial venation
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The tissue involved in secondary growth are

  1. Vascular cambium
  2. Cork cambium
  3. Pith
  4. Both A and B
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In dicot stem the cells of cambium present between primary xylem and primary phloem is the ___________.

  1. Intrafascicular cambium
  2. Interfascicular cambium
  3. Metafascicular cambium
  4. Radial cambium
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When cambial ring becomes active, the cells cut off toward pith mature into

  1. Primary xylem
  2. Secondary xylem
  3. Primary phloem
  4. Secondary phloem
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When cambial rings become active and the cells cut off towards periphery mature into

  1. Secondary phloem
  2. Primary phloem
  3. Primary xylem
  4. Secondary xylem
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The cambium is generally more active on the _________ side than the _________ side.

  1. Inner, outer
  2. Outer, inner
  3. Radial, inner
  4. Radial, outer
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The primary and secondary phloem gets gradually crushed due to the continued formation and accumulation of _________.

  1. Secondary xylem
  2. Resin
  3. Wax
  4. Bark
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In dicot stem, at some places the cambium forms a narrow band of parenchyma which passes through the secondary xylem and secondary phloem in radial direction these are called _________.

  1. Secondary medullary rays
  2. Rays
  3. Primary medullary rays
  4. Tertiary medullary rays
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