23. Write the function of the following with respect to the point given below:
(ii) Pollen tube develops from pollen grains when pollen grains land on stigma.
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ᴘᴏʟʟᴇɴ ᴛᴜʙᴇ ꜰᴏʀᴍᴀᴛɪᴏɴ ɪꜱ ɪᴍᴘᴏʀᴛᴀɴᴛ ꜰᴏʀ ꜱᴇxᴜᴀʟ ʀᴇᴘʀᴏᴅᴜᴄᴛɪᴏɴ ᴛᴏ ᴏᴄᴄᴜʀ ɪɴ ꜱᴇᴇᴅ ᴘʟᴀɴᴛꜱ. ᴘᴏʟʟᴇɴ ᴛᴜʙᴇꜱ ᴀᴄᴛ ᴀꜱ ᴄᴏɴᴅᴜɪᴛꜱ ᴛᴏ ᴛʀᴀɴꜱᴘᴏʀᴛ ᴛʜᴇ ᴍᴀʟᴇ ɢᴀᴍᴇᴛᴇ ᴄᴇʟʟꜱ ꜰʀᴏᴍ ᴛʜᴇ ᴘᴏʟʟᴇɴ ɢʀᴀɪɴ—ᴇɪᴛʜᴇʀ ꜰʀᴏᴍ ᴛʜᴇ ꜱᴛɪɢᴍᴀ (ɪɴ ꜰʟᴏᴡᴇʀɪɴɢ ᴘʟᴀɴᴛꜱ) ᴛᴏ ᴛʜᴇ ᴏᴠᴜʟᴇꜱ ᴀᴛ ᴛʜᴇ ʙᴀꜱᴇ ᴏꜰ ᴛʜᴇ ᴘɪꜱᴛɪʟ ᴏʀ ᴅɪʀᴇᴄᴛʟʏ ᴛʜʀᴏᴜɢʜ ᴏᴠᴜʟᴇ ᴛɪꜱꜱᴜᴇ ɪɴ ꜱᴏᴍᴇ ɢʏᴍɴᴏꜱᴘᴇʀᴍꜱ.
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