Question

In a leaf protoxylem faces towards :

• A. Not specified clearly
• B. Lower epidermis
• C. Upper epidermis
• D. Centre of vascular bundle

Answer 1

The correct option is C

Upper epidermis

A dorsiventral leaf, which is present at an angle to the main axis and perpendicular (normal) to sunlight direction, has two distinct surfaces, the upper or inner or adaxial or ventral and the outer or abaxial or dorsal. The xylem has protoxylem lying towards the upper side i.e., adaxial surface and metaxylem in lateral sides. Phloem is present towards lower epidermis with protophloem on abaxial surface. The correct answer is A.