Answer:
A: Apical Meristem Tissue
Step-by-step explanation:
Meristems (or metistamatic tissues) are groups of actively dividing cells. In plants, these meristems are divided into 3 main groups:
- Apical meristems refers to the tissues around the apices of roots, new shoots and leaves. They are responsible for shoot and root elongation as well as the appearance of new leaves.
- Intercalary meristems are tissues found in between branches. They are responsible for rapid growth in most monocots
- Lateral meristems are those found in the lateral regions of plants. They are responsible for increase in girths in plants, especially the woody ones.
The appearance of tiny leaves at the apex of the sunflower planted by Susan must have been due to cell division activities in the apical shoot regions of the seedlings.
Hence, the correct answer is A