Question

Xylem is V shaped in stem of /or protoxylem cavity is absent in
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O Maize
O Monocots
Sunflower
o Wheat
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Answer 1

Answer:

maize

Explanation:

they are absent in the smaller vascular bundles

Answer 2

Answer:

Xylem is V-shaped in stem or protoxylem cavity is absent in maize

Explanation:

• A thin transverse section of the young stem of maize reveals its internal structure from the periphery to the centre.  

• The vascular bundles are many in number and are of variable size.
• They are conjoint, collateral, endarch, closed and lie scattered in the ground tissue.  

• The vascular bundles consist of two parts- the xylem and phloem.
• The peripherally located V.bundles are smaller than the centrally placed ones.

• The xylem consists of 4 distinct vessels arranged in the form of a Y, and a small number of tracheids arranged irregularly.

• The lowermost protoxylem vessels and xylem parenchyma cells dissolve forming a water-containing schizo-lysigenous cavity called protoxylem cavity or lacuna or lysigenous cavity.

• Thus, a Protoxylem cavity and protophloem may be absent in the smaller vascular bundles in maize (Zea mays).

Thus, the correct answer is maize where V-shaped xylem in the stem or protoxylem cavity is absent.

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