The correct answer is option 1, which states that the intercalary meristem in plants is located at the base of the leaves or internodes.

Intercalary meristem is a region of actively dividing cells in plants that allows for growth in length. It is found in specific locations within the plant body.

Option 2, which states that intercalary meristem is located in stems or roots, is incorrect. While stems and roots do contain meristematic tissue for growth, the intercalary meristem specifically refers to a distinct region in the plant where growth occurs.

Option 3, stating that intercalary meristem is found at the tips of stems and leaves, is also incorrect. The tip of stems and leaves typically have apical meristems, which are responsible for primary growth in plants.

Option 4, stating that intercalary meristem is located at the base of flower pedicel, is also incorrect. The base of the flower pedicel does not contain intercalary meristem, but rather other types of meristematic tissues involved in flower development.

In summary, the correct answer is option 1, as intercalary meristem is located at the base of the leaves or internodes in plants.