What is meant by 'source to sink' flow in phloem transport?
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ᴛʜᴇ ʜɪɢʜ ᴛᴜʀɢᴏʀ ᴘʀᴇssᴜʀᴇ ᴅʀɪᴠᴇs ᴍᴏᴠᴇᴍᴇɴᴛ ᴏғ ᴘʜʟᴏᴇᴍ sᴀᴘ ʙʏ “ʙᴜʟᴋ ғʟᴏᴡ” ғʀᴏᴍ sᴏᴜʀᴄᴇ ᴛᴏ sɪɴᴋ, ᴡʜᴇʀᴇ ᴛʜᴇ sᴜɢᴀʀs ᴀʀᴇ ʀᴀᴘɪᴅʟʏ ʀᴇᴍᴏᴠᴇᴅ ғʀᴏᴍ ᴛʜᴇ ᴘʜʟᴏᴇᴍ ᴀᴛ ᴛʜᴇ sɪɴᴋ. ʀᴇᴍᴏᴠᴀʟ ᴏғ ᴛʜᴇ sᴜɢᴀʀ ɪɴᴄʀᴇᴀsᴇs ᴛʜᴇ Ψs, ᴡʜɪᴄʜ ᴄᴀᴜsᴇs ᴡᴀᴛᴇʀ ᴛᴏ ʟᴇᴀᴠᴇ ᴛʜᴇ ᴘʜʟᴏᴇᴍ ᴀɴᴅ ʀᴇᴛᴜʀɴ ᴛᴏ ᴛʜᴇ xʏʟᴇᴍ, ᴅᴇᴄʀᴇᴀsɪɴɢ Ψᴘ.
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