Which of the following statements with reference to Humus is/are correct? 1. It is a dark coloured amorphous substance. 2. Being colloidal in nature, it serves as a reservoir of nutrients. Select the answer using the code given below :

Humus is the dark-coloured, amorphous (non-crystalline) organic matter formed by the decomposition of plant and animal remains in soil. It is colloidal in nature, meaning it can hold ions on its surface, thereby acting as a reservoir of plant nutrients (like nitrogen, phosphorus, potassium) and also improving soil structure and water retention. Both statements correctly describe properties of humus.