Question

Position of protoxylem and protophloem in leaf, respectively, is

• A. Abaxial and adaxial
• B. Adaxial and abaxial
• C. Both abaxial
• D. Both adaxial

Answer 1

The correct option is B

Adaxial and abaxial

The correct option is B:

Explanation for correct answer:

1. A dorsiventral leaf is a dicot leaf that has a distinct dorsal (top) texture and a ventral (bottom) texture.
2. Xylem acts as a mineral and water salt transporter from the roots to various areas of the plant, whereas phloem transports sugar and amino acids from the leaves to various parts of the plant.
3. The midrib communicates with the vascular divisions of the dorsiventral dicot leaf.
4. In this case, the xylem is available to the top epidermis while the phloem is accessible to the deeper epidermis.
5. These are security, conjoint, close the situation of protoxylem, and metaxylem is not clearly mentioned.
6. The top or inner or adaxial or ventral and the outer or abaxial or dorsal sides of a dorsiventral leaf are exposed at a perimeter to the conceptual pivot and opposed (normal) to daylight heading.

Explanation for incorrect answer:

Option A:

1. The top and deeper epidermis are made up of tightly packed, barrel-shaped cells with no intercellular spaces and a fingernail membrane on both levels.
2. Veins are vascular bundles that are created randomly scattered throughout the brilliant mesophyll parenchyma, with the largest and most developed one at emphasis, known as the midrib vein.

Option C:

1. The metaxylem is accessible from the same sides.
2. With protoplasm on the abaxial texture, phloem is accessible towards the deeper epidermis.
3. The adaxial/abaxial arrangement of maize leaves is maintained in the meristem during leaf modification.

Option D:

1. A Leaf with both abaxial aspects will be offset or meet indefinitely from the pivot.
2. The texture is matte, deep green, and lacking in trichomes.

Final answer:

The position of protoxylem and protophloem in the leaf, respectively, is Adaxial and abaxial.