I believe the personality will be affected in the development process. The three tasks of Ego integrity are: Ego differentiation versus work-role preoccupation; Body transcendence versus body preoccupation and Ego transcendence versus ego preoccupation. According to the body transcendence versus body preoccupation; Enjoys life to fullest despite minor physical limitations; must see beyond physical aging and appreciate satisfaction in other areas. Emphasize other abilities: cognitive and social skills to compensate for physical changes.
Because the underground part of the stem gets thickened. This part of the stem is known as tuber. The tubers store the food supply for the leafy part of the plant and get thickened. Hope this helps!