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Also question is, how does the pitcher plant catch the food?
Pitcher plants (or pitfall traps) are carnivorous plants whose prey-trapping mechanism features a deep cavity, formed by a cupped leaf and filled with a digesting liquid. Insects such as flies are attracted to the cavity, often by visual lures such as anthocyanin pigments, and nectar bribes, Pitcher plants.
Considering this, do carnivorous plants make their own food?
Like all green plants, Venus flytraps use their leaves to harness energy from the sun and make their own food; they use carbon dioxide (CO2) to make energy-rich carbohydrates. So they are Producers.
Answer: The insectivorous plants grow in soil which do not contain sufficient nitrogen mineral. These plants (e.g. pitcher plant) are green and carry out photosynthesis to obtain a part of the food required by them. But they do not get the nitrogen from the soil in which they grow.