Example 1 · difficulty 2/5
From outside inward, the wall layers of a young microsporangium are:
- A. Tapetum, epidermis, endothecium, middle layers
- B. Epidermis, endothecium, middle layers, tapetum
- C. Epidermis, tapetum, middle layers, endothecium
- D. Endothecium, epidermis, tapetum, middle layers