Pith is ___________ in monocot stem.

(A)differentiated

(B)undifferentiated

(C) not formed

(D) Both A and C

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Primary xylem is of two types, they are-

  1. Protoxylem and metaxylem
  2. Xylem parenchyma and xylem fibres
  3. Tracheids and vessels
  4. Simple xylem and complex xylem
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In stems the Protoxylem lies toward ______and Metaxylem lies toward the_________ respectively.

  1. Centre, periphery
  2. Periphery, centre
  3. Below, above
  4. Above, below
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In roots, the Protoxylem lies toward __________ and Metaxylem lies toward the _______ respectively.

  1. Periphery, centre
  2. Centre, periphery
  3. Above, below
  4. Below, above
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Phloem in angiosperm is composed of
1. Sieve tube element
2. Companion cell
3. Phloem parenchyma
4. Phloem fibres
5. Tracheids
6. Vessels
A. 1,2,3,4
B. 2,3,4,5
C. 3,4,5,6
D. None

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Phloem of gymnosperm consist of

  1. Albuminous cells and Sieve cells
  2. Sieve tubes and companion cells
  3. Phloem parenchyma and phloem fibres
  4. None of the above
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Function of sieve tubes are controlled by

  1. Nucleus of sieve tube
  2. Nucleus of companion cell
  3. Nucleus of parenchyma
  4. No function as they are dead cells
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The companion cells help in maintaining the ________ in the sieve tube.

  1. Temperature gradient
  2. Cellulose gradient
  3. Pressure gradient
  4. Ion gradient
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Resin, latex and mucilage are found in

  1. Phloem parenchyma
  2. Xylem parenchyma
  3. Phloem pits
  4. None of the above
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Phloem parenchyma is absent in most of the

  1. Dicotyledons
  2. Monocotyledons
  3. Desert plants
  4. None of the above
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