Dormancy due to hard seed coats that prevent uptake of `O_2` (or) water is observed in A and can be broken by B.

Options

A. A-Fabaceae, B-stratification
B. A-Liliaceae, B-scarification
C. A-Fabaceae, B-scarification
D. A-Solanaceae, B-stratification

Answer

To solve the question regarding dormancy due to hard seed coats, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Dormancy**: Dormancy in seeds can occur due to various factors, one of which is the presence of hard seed coats that prevent the uptake of essential elements like oxygen and water.

2. **Identify the Family of Plants**: The question specifies that this type of dormancy is observed in a particular plant family. From the video transcript, it is indicated that this dormancy is observed in the family **Fabiaceae**.

3. **Recognize the Method to Break Dormancy**: The transcript mentions that the dormancy caused by hard seed coats can be broken by a specific technique. The technique referred to is **scarification**. This process involves physically altering the seed coat to allow water and oxygen to penetrate, which encourages germination.

4. **Summarize the Findings**: Based on the analysis:
- A (the plant family) is **Fabiaceae**.
- B (the method to break dormancy) is **scarification**.

5. **Conclude the Answer**: Therefore, the correct answer to the question is:
- A: Fabiaceae
- B: Scarification

### Final Answer:
Dormancy due to hard seed coats that prevent uptake of O2 (or) water is observed in **Fabiaceae** and can be broken by **scarification**.

---