HomepageMedical Entrance Exam GkSeries Editor in Medical Entrance Exam Diameter of pollen grain is Diameter of pollen grain is Option 1 : 20–50 μmOption 2 : 25–50 μmOption 3 : 30–50 μmOption 4 : 10–50 μm Next Read: A closed tank contains 0.5 m thick layer of mercury (specific gravity = 13.6) at the bottom » BiologyMedicalNEET GkSeries Editor: