A. Dionaea, also called as venus fly trap is an insectivorous parasitic plant native to the USA.

Mucor is a type of fungi, which is not an autotroph but is a saprophyte. It feeds on the dead and decaying matter.

A. The name autotroph is derived as "auto" means self and "troph" means feeding. so, the plants which can manufacture its own food are called as autotrophs. 

• Autotrophs are organisms, that can prepare their own food through the process of photosynthesis such as plants.
• An epiphyte is used to refer to a plant, that grows on another plant but is not dependent on that plant for its nutrition. 
• When an organism is nutritionally dependent on another organism, it is called parasitism. 
• Saprophytes are organisms, that feed on dead organic matter.
• Thus, option A is correct.

• Heterotrophs are unable to prepare their food wholly or partially and obtained food from the plant, called herbivores and from other animals, called as carnivores. 
• Autophytes are the plants that can manufacture their own food. Halophytes are plants that grow in extremely saline conditions. 
• Holophytes are the organism that prepares their food by photosynthesis.

A detritivore is a heterotrophic organism, which obtains its nutrition by feeding on detritus. Detritus is the organic matter made up of dead plant and animal material. So, the correct option is 'Dead and decomposed matter in the soil'.

• There are five steps in the process of Nutrition in animals. 

Herbivores are animals that consume plants as their food. Herbivores are at second level of food chain and are considered primary consumers.

Suspended food (phytoplankton, zooplankton, algae and other water-borne nutrients and particles) are trapped in the mucus of a gill, and from there are transported to the mouth, where they are eaten, digested and expelled as faeces or pseudofeces.

Fluid-feeding insects, such as butterflies, moths, and flies (20% of all animal species), are faced with the common selection pressure of having to remove and feed on trace amounts of fluids from porous surfaces. 

The process in the alimentary canal by which food is broken up physically, as by the action of the teeth, and chemically, as by the action of enzymes, and converted into a substance suitable for absorption and assimilation into the body.

• Continuous feeders: That must "eat" constantly because the food is taken in and then pushed out soon afterwards are called continuous feeders. Most of these animals either are permanently attached to something (such as clams or mussels) or are very slow moving.
  
• Discontinuous feeders: Consume larger meals and store the ingested food for later digestion. These animals generally are more active and can avoid predators. Hence, the animals that feed discontinuously must have digestive tracts that permit storage and are able to avoid predators by limiting their feeding time.