Four students were each asked to propose a set of four labels for a plan diagram showing a transverse section of a dicotyledonous leaf. Which student, A, B, C or D, proposed the correct set of labels?
- Alabel 1: lower epidermis; label 2: phloem; label 3: spongy mesophyll; label 4: palisade mesophyll
- Blabel 1: phloem sieve tubes; label 2: upper epidermis; label 3: spongy mesophyll; label 4: xylem vessel elements
- Clabel 1: spongy mesophyll; label 2: endodermis; label 3: xylem vessel elements; label 4: palisade mesophyll
- Dlabel 1: waxy cuticle; label 2: xylem; label 3: companion cells; label 4: spongy mesophyll