Because they don't contain chlorophyll in them.
it has tiny leaves
Yes it does cause if leaves do not have chlorophyll,their colour won't be green in colour.
Most are shades of green though some have a blue tinge.
They contain chloroplasts which are green in colour.
No species of eucalyptus has blue and pink leaves. Some species, such as the Blue gum, have leaves which are a grey/green/blue colour.
Green leaves, white petals with yellow centers
chlorophyll
No, it is not protoplast
Maybe. Chlorophyll is what colours leaves green, and is what is responsible for photosynthesis. Although leaves may not appear green that may be because another agent (for example, Anthocyanin, a pigment that appears in the sugar of plants) is overpowering the colour of the chlorophyll, but it may still be present in the leaves and therefore these leaves may be undergoing photosynthesis.
Leaves that do not have a uniform colour are called variegated leaves.
The green colour of the leaves is from the pigment chlorophyll
chlorophyll