The diagram shows part of a leaf viewed in cross section under a microscope. What are the names of regions 1, 2 and 3?
- A1 palisade mesophyll, 2 vascular bundle, 3 spongy mesophyll
- B1 spongy mesophyll, 2 palisade mesophyll, 3 vascular bundle
- C1 vascular bundle, 2 palisade mesophyll, 3 spongy mesophyll
- D1 vascular bundle, 2 spongy mesophyll, 3 palisade mesophyll