Question

How does (a) Cuscuta absorb its food (b) saprophyte digest the food?

Answer 1

The saprophytes secrete digestive juices on dead and decaying matter and convert it into a solution. They then absorb the nutrients from it.

Cuscuta grows on other plants and literally suck required nutrition from them through their hosteria, that I like to call Dracula's fangs. The hosteria is injected into living cells like fangs and nutrients are mercilessly absorbed.