Question

In a dorsiventral leaf, the location of xylem and phloem is
A. Abaxial and Adaxial respectively
B. Adaxial and Abaxial respectively
C. Both are abaxial
D. Both are adaxial

Answer 1

A dorsiventral leaf is a structure that has an unmistakable dorsal (upper) surface and ventral (lower) surface found in dicots. Xylem acts as a transporter of water and mineral salt from the roots to different pieces of the plant, whereas phloem acts as a carrier of sucrose and amino acids from the leaves to numerous segments of the plant.

Complete answer:
In dorsiventral or dicot leaf, the midrib or principle vein speaks to the vascular groups. In this, xylem is available towards the upper epidermis and phloem present towards the lower epidermis. These are insurance, conjoint, shut the situation of protoxylem, and metaxylem is not indicated specifically.

A dorsiventral leaf, which is available at an edge to the principle pivot and opposite (ordinary) to daylight heading, has two unmistakable surfaces, the upper or internal or adaxial or ventral and the external or abaxial or dorsal. The upper and lower epidermis is made out of compactly arranged, barrel-formed cells with no intercellular spaces and a fingernail skin on both the layers.

Veins speak to the vascular packs that are found sporadically dissipated in the light parenchyma of mesophyll with the biggest and the most seasoned one at focus, named as midrib vein. The metaxylem is available on parallel sides. Phloem is available towards the lower epidermis with protophloem on the abaxial surface.

The abaxial/adaxial extremity of the maize leaf is set up in the meristem and is in this manner kept up all through leaf improvement.

Hence, the correct answer is option (B).

Additional information:
- A Leaf with both abaxial sides will be away from one another or confronting endlessly from the pivot. The surface is matte, dark green, and trichome poor.
- Light catching is the specialization of the adaxial or upper surface and the abaxial or lower surface is specific for gas trade.

Note: A dorsiventral organ is one that has two surfaces contrasting from one another in appearance and structure, as a customary leaf. In the vascular groups of leaves, xylem is coordinated towards the adaxial or upper epidermis side and phloem is coordinated towards the lower or abaxial epidermis side. The upper and lower epidermis is made out of compactly arranged, barrel-formed cells with no intercellular spaces and a fingernail skin on both the layers.