Question

What is external fertilization? Mention its disadvantage.. 2?

Answer 1

External fertilization is a reproductive strategy used by many species of aquatic animals. In this strategy, both eggs and sperms are released in the water. Egg fertilize when the sperm reaches the egg. Usually external fertilization is done through spawning. Spawning is a behavior, where many females and male release their eggs and sperms at one place to ensure the fertility of maximum eggs. Frogs, fishes and many other aquatic animals do external fertilization.

Main disadvantage of external fertilization is that it requires aquatic medium to transport sperm to egg. Another disadvantage is that large amount of eggs and sperms get wasted as they never get fertilized.

Answer 2

Answer:

ᴇxᴛᴇʀɴᴀʟ ꜰᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ ɪꜱ ᴀ ᴍᴏᴅᴇ ᴏꜰ ʀᴇᴘʀᴏᴅᴜᴄᴛɪᴏɴ ᴄʜᴀʀᴀᴄᴛᴇʀɪᴢᴇᴅ ʙʏ ᴛʜᴇ ꜰᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ ᴏꜰ ᴍᴀʟᴇ ᴀɴᴅ ꜰᴇᴍᴀʟᴇ ɢᴀᴍᴇᴛᴇꜱ ᴏᴜᴛꜱɪᴅᴇ ᴛʜᴇ ʙᴏᴅʏ ᴏꜰ ᴛʜᴇ ᴏʀɢᴀɴɪꜱᴍꜱ. ᴇxᴛᴇʀɴᴀʟ ꜰᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ ɪꜱ ᴏʙꜱᴇʀᴠᴇᴅ ɪɴ ᴀᴍᴘʜɪʙɪᴀɴꜱ ꜱᴜᴄʜ ᴀꜱ ꜰʀᴏɢꜱ ᴀɴᴅ ᴛᴏᴀᴅꜱ. ʜᴏᴡᴇᴠᴇʀ, ᴛʜᴇʀᴇ ᴀʀᴇ ᴀ ꜰᴇᴡ ᴅʀᴀᴡʙᴀᴄᴋꜱ ᴏꜰ ᴇxᴛᴇʀɴᴀʟ ꜰᴇʀᴛɪʟɪᴢᴀᴛɪᴏɴ:

• ᴛʜᴇ ᴄʜᴀɴᴄᴇꜱ ᴏꜰ ꜱᴜʀᴠɪᴠᴀʟ ᴏꜰ ᴛʜᴇ ɢᴀᴍᴇᴛᴇꜱ ᴀʀᴇ ᴠᴇʀʏ ʟᴇꜱꜱ.

• ɴᴏᴛ ᴀʟʟ ᴛʜᴇ ɢᴀᴍᴇᴛᴇꜱ ᴀʀᴇ ꜰᴇʀᴛɪʟɪᴢᴇᴅ.

• ᴛʜᴇ ɢᴀᴍᴇᴛᴇꜱ ᴍɪɢʜᴛ ᴅᴇꜱɪᴄᴄᴀᴛᴇ.

• ᴛʜᴇ ᴘʀᴇᴅᴀᴛᴏʀꜱ ᴜꜱᴜᴀʟʟʏ ᴇᴀᴛ ᴛʜᴇ ᴇɢɢꜱ.