To solve the analogy "tree : leaf :: ?", we need to identify the relationship between "tree" and "leaf". A leaf is a part of a tree, representing a whole to part relationship. Thus, we seek an option where the second word is a part of the first.
Let's examine the options:
tiger : cubs
This represents a parent to offspring relationship, not a whole to part.
bows : arrows
This represents an accessory or usage relationship, not a whole to part.
plants : sunlight
This represents a consumption or dependence relationship, not a whole to part.
flower : petal
This represents a whole to part relationship, as petals are parts of a flower, similar to how leaves are parts of a tree.
Therefore, the most appropriate analogy is "flower : petal".