Movement of phloem sap from a source to a sink a. occurs through the apoplast of sieve-tube elements. b. depends ultimately on the activity of proton pumps. c. depends on tension, or negative pressure potential. d. results mainly from diffusion.

Video transcript

Hello everyone here. We have a question saying during the april plastic flow, unloading sugar enters the flowing through blank. So we have a proton pump here and our flow um is going to be down here and outside the cell. We're going to have our companion cell. So we've got our protein proton pump and then we have our co transporter. And what will happen is our hydrogen will go from low to high concentration and it will diffuse back in our co transporter, which will allow sucrose in with it. So we have sucrose coming in with it and that's why it's called a co transporter because we have the two coming in together. So this is going from low too high concentration, which means it is primary active transport. So our answer here is a primary active transport. Thank you for watching. Bye.