The mode of nutrition in tapeworm is holozoic.

Holozoic nutrition is a type of heterotrophic nutrition in which an organism ingests complex organic food materials and then digests them internally to obtain nutrients. It is the mode of nutrition used by most animals, including tapeworms.

Tapeworms are parasitic flatworms that live in the intestines of vertebrate hosts, such as humans and animals. They have a specialized structure called a scolex, which allows them to attach to the intestinal wall of their host.

How tapeworms obtain nutrition through holozoic nutrition:
1. Ingestion: Tapeworms do not have a digestive system of their own. They absorb nutrients from the host's digested food. The primary source of nutrition for tapeworms is the partially digested food present in the host's intestines.

2. Absorption: As the host digests its food, the tapeworm absorbs the nutrients through its body surface. The body surface of tapeworms is covered with microvilli, which increase the surface area for absorption.

3. Diffusion: Nutrients, such as glucose, amino acids, and fatty acids, passively diffuse through the tapeworm's body surface and into its cells. This process is facilitated by the concentration gradient between the host's intestines and the tapeworm's body.

4. Distribution: Once inside the tapeworm's body, the absorbed nutrients are distributed to the different parts of its body through diffusion. This allows the tapeworm to grow and reproduce.

5. Excretion: Tapeworms produce waste products, such as urea and carbon dioxide, which are eliminated from their body through diffusion back into the host's intestines.

Conclusion:
Tapeworms exhibit holozoic nutrition, as they ingest partially digested food from their host's intestines, absorb nutrients through their body surface, and distribute these nutrients to different parts of their body. They do not have their own digestive system and rely on the host's digestion for obtaining nutrition.