Which direction is vertical velocity to a flying object

This answer completely depends on the trajectory of the flying object. If it is increasing in altitude (such as a plant at take off) then it will have a positive vertical velocity directly upward (perpendicular to the ground). If the object is cruising (like a plane) at a fixed altitude, the vertical speed and velocity will be zero, so there will be no angle. If the object is descending in altitude, then there will be a vertical velocity with direction toward the ground.

An autotrophic protist - they can perform photosynthesis and mainly consist of unicellular algae. they can be divided into number of systematic group according to the shape of their cell and the type of photosynthetic pigments they use.