Observation of flagella in the biflagellate alga, chlamydomonas reinhardtii, indicates that particles move toward the tips of flagella at a rate of 2.5μm/min, but the particles moving back toward the base of flagella move at 4μm/min. how do you explain this difference in rate of movement? observation of flagella in the biflagellate alga, chlamydomonas reinhardtii, indicates that particles move toward the tips of flagella at a rate of , but the particles moving back toward the base of flagella move at . how do you explain this difference in rate of movement? a. particles use different motors with different velocities to move outward and inward. b. there are different pressures at the tips of flagella and at the base of flagella. c. the gravity increases the rate of movement toward the base of flagella. d. there are different concentrations of the particles at the tips of flagella and at the base of flagella.