No.
CPU's (Processors) are usually one socket units with all needed hardware on one socketed bit of silicon. They are not usually contained on expansion cards or adapters except in cases of very old computer or some blade servers or older hardware.
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The expansion slot is the socket on the motherboard that can hold an adapter card. There are different types of expansion slots (pci, pcie, pciex16) so you need to check that the expansion is the same kind as the adapter card.
An adapter card is an internal card that enables your computer to communicate with another peripheral such as a monitor.
PCI
A video card or video adapter translates binary data into images.
The expansion card called the host adapter is responsible for managing all devices on the SCSI bus. SCSI is a peer to peer interface
Only graphics cards are inserted into a PCIe x16 expansion slot.
A video display (aiso called a video card,display card ,graphic card,graphic board, display adapter or graphics adapter) is an expansion card which generates a feed of output images to a display.Most vidio cards after various function such as accelerater rendering of 3d scenes and 2d graphics ,mpeg.2/mpeg-4 decoding,tv output.
To use a CF card adapter for an SD card, simply insert the SD card into the adapter and then insert the adapter into the CF card slot on your device. Make sure the adapter is securely in place before using the SD card.
There are several different expansion slots that are compatible with video adapter cards. PCI, AGP, and PCI-Express x1 are all formats that are rarely used these days. The most popular format at the moment is PCI-Express x16.
Host Adapter
If you mean an SD card adapter, you put it in a USB slot, then simply plug the SD card into the adapter. If it is some other memory card (for a gaming console) then an adapter is most likely USB compatible.
Motherboards can have one to six expansion card slots and a large number of USB connectors for adapters.