Concept:Pitcher plants obtain part of their food by trapping and digesting insects, making this a specialised form of heterotrophic nutrition.
Explanation:Nutrition is broadly classified into autotrophic and heterotrophic types.
Autotrophic organisms make their own food, while heterotrophic organisms depend on other organic sources.
A pitcher plant is green and can photosynthesise, but it grows in poor soil that lacks nitrogen.
To overcome this, its modified leaves form pitcher-like structures that trap insects.
The plant secretes digestive enzymes to break down the insect body and absorb the nutrients.
Since it consumes organic matter from other living organisms, this insect-feeding habit is a special form of heterotrophic nutrition.
Therefore, the mode of nutrition shown by the pitcher plant is not saprophytic, chemosynthetic, or autotrophic, but heterotrophic.
Answer:A. Heterotrophic