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The pollen belongs to Stephanotis floribunda . The lens power is 10x, so the pollen is close to 10-30 micrometers in size.

Questions about my image: Why are the pollen different sized? Why are they colored that way (yellowy-white)?

Approach: It may have different sizes for different sized bees that pollinate the plant. And they may be colored that way because it is more attractive to the bees.

Pollen from different plants look different. Take for example some images from a quick Google search:

#caltechbi1