Step 1: Understanding the Question:
This question tests knowledge of wood properties.
Step 2: Detailed Explanation:
Ochroma pyramidalis (balsa) is known for its extremely light wood.
It is used for making floats, model airplanes, and insulation.
Abies pindrow (A): Not light wood.
Acer oblongum (B): Not light wood.
Artocarpus hirsuta (D): Not light wood.
Thus, the correct answer is Ochroma pyramidalis.
Step 3: Final Answer:
Thus, Ochroma pyramidalis is known for its light wood, which corresponds to option (C).
[0.5cm]