Dual boot/single boot boot partition questions – Linux Mint

In single boot Hard Disk where Linux is the sole OS,when installing latest version of Linux Mint & selecting Something Else to do manual partitioning,is it still necessary to create boot partitions? /boot partition in BIOS /MBR disk
/boot/efi partition in UEFI/GPT disk

When dualbooting(Windows & Linix) the OS’es share the same boot partition.that is in Uefi/Gpt mode>Efi System Partition /boot/efi
Bios/Mbr mode>System Reserved /boot
The bootloader partitionsize is 100MB whereas the requirement for Linux is 260 to 512MiB…so how to enlarge or is 100MB sufficient?

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