Question

What do you mean by external fertilisation?​

Answer 1

External fertilization usually occurs in aquatic environments where both eggs and sperm are released into the water. ... Most external fertilization happens during the process of spawning where one or several females release their eggs and the male(s) release sperm in the same area, at the same time.

Answer 2

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• ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ ɪs ᴛʜᴇ ᴘʀᴏᴄᴇss ɪɴ ᴡʜɪᴄʜ ᴛʜᴇ ғᴜsɪᴏɴ ᴏғ ᴍᴀʟᴇ ᴀɴᴅ ғᴇᴍᴀʟᴇ ɢᴀᴍᴇᴛᴇ ᴛᴀᴋᴇs ᴘʟᴀᴄᴇ ᴏᴜᴛsɪᴅᴇ ᴛʜᴇ ғᴇᴍᴀʟᴇ ʙᴏᴅʏ ɪɴ ᴀɴ ᴇxᴛᴇʀɴᴀʟ ᴍᴇᴅɪᴜᴍ, ɢᴇɴᴇʀᴀʟʟʏ ᴡᴀᴛᴇʀ. ғᴏʀ ᴇxᴀᴍᴘʟᴇ, ғɪsʜ, ғʀᴏɢ, sᴛᴀʀғɪsʜ ᴇᴛᴄ. ᴜɴᴅᴇʀɢᴏ ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ.

• ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ ʜᴀs ᴄᴇʀᴛᴀɪɴ ᴅɪsᴀᴅᴠᴀɴᴛᴀɢᴇs. ɪɴ ᴇxᴛᴇʀɴᴀʟ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ, ᴇɢɢs ʜᴀᴠᴇ ғᴇᴡᴇʀ ᴄʜᴀɴᴄᴇs ᴏғ ғᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ. ᴛʜɪs ᴄᴀɴ ʟᴇᴀᴅ ᴛᴏ ᴛʜᴇ ᴡᴀsᴛᴀɢᴇ ᴏғ ᴀ ʟᴀʀɢᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴛʜᴇ ᴇɢɢs ᴅᴜʀɪɴɢ ᴛʜɪs ᴘʀᴏᴄᴇss. ғᴜʀᴛʜᴇʀ, ᴛʜᴇʀᴇ ɪs ᴀɴ ᴀʙsᴇɴᴄᴇ ᴏғ ᴘʀᴏᴘᴇʀ ᴘᴀʀᴇɴᴛᴀʟ ᴄᴀʀᴇ ᴛᴏ ᴛʜᴇ ᴏғғsᴘʀɪɴɢ, ᴡʜɪᴄʜ ʀᴇsᴜʟᴛs ɪɴ ᴀ ʟᴏᴡ ʀᴀᴛᴇ ᴏғ sᴜʀᴠɪᴠᴀʟ ɪɴ ᴛʜᴇ ᴘʀᴏɢʀᴇss.