Read the following statements and select the correct option:
(a) Major reservoirs of phosphorus are phosphate rocks and fossil bone deposits laid down in the past geological ages.
(b) During weathering of rocks, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants.

Options

A. (b) is correct but (a) is false.
B. Both (a) and (b) are true
C. is correct but (b) is false.
D. Both (a) and (b) are false.

Answer

To solve the question regarding the statements about phosphorus reservoirs and the weathering of rocks, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyze Statement (a)**:
- The statement claims that "Major reservoirs of phosphorus are phosphate rocks and fossil bone deposits laid down in the past geological ages."
- Phosphorus is primarily found in phosphate rocks and fossilized bones, which are indeed significant reservoirs of phosphorus. This statement is **true**.

2. **Analyze Statement (b)**:
- The statement claims that "During weathering of rocks, minute amounts of these phosphates dissolve in soil solution and are absorbed by the roots of the plants."
- Weathering of rocks does lead to the release of phosphates into the soil solution, which can then be absorbed by plant roots. This statement is also **true**.

3. **Conclusion**:
- Since both statements (a) and (b) are true, we can conclude that the correct option is the one that states both A and B are true.

### Final Answer:
Both statements A and B are true.