Nepenthes (commonly called as pitcher plant), an insectivorous plant usually grows in marsh lands. Which part of the plant is modified into a 'pitcher'? How does this modification help the plant for food even though it can photosynthesize like any other green plant?

Explanation

### Step-by-Step Solution:

1. **Identify the Modified Part**: In Nepenthes, commonly known as the pitcher plant, the leaves are modified into a structure called a 'pitcher'.

2. **Structure of the Pitcher**: The pitcher has a unique design that includes a lid formed by the apex of the leaf lamina. The interior part of the petiole (the stalk that attaches the leaf to the stem) is coiled like a tendril, which helps support the pitcher and keeps it in an upright position.

3. **Nutrient Deficiency in Habitat**: The pitcher plant typically grows in marshlands where the soil is deficient in nitrogen. This lack of nitrogen in the soil is a significant factor that influences the plant's adaptation.

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