The acquisition of ability to flower by chilling treatment is called
(a) Vernalization
(b) Yarovization
(c) Springification
(d) All of these

Options

A. Vernalization
B. Yarovization
C. Springification
D. All of these

Answer

To solve the question regarding the acquisition of the ability to flower by chilling treatment, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Flowering**:
- Flowering in plants can be influenced by various environmental factors, including temperature. Some plants require specific conditions to trigger their flowering process.

**Hint**: Consider how environmental factors like temperature can affect plant growth and development.

2. **Identify the Role of Chilling Treatment**:
- Chilling treatment refers to exposing plants to cold temperatures. This treatment can induce flowering in certain species that would not otherwise flower under normal conditions.

**Hint**: Think about how cold temperatures might signal to plants that it's time to flower.

3. **Define Vernalization**:
- Vernalization is the process by which a period of cold exposure (chilling treatment) is required for some plants to flower. It is a mechanism that allows plants to time their flowering to favorable conditions.

**Hint**: Recall the term that describes the process of needing cold exposure to induce flowering.

4. **Evaluate the Options**:
- (a) Vernalization: Correct, as it specifically refers to the chilling treatment that induces flowering.
- (b) Yarovization: This term is less commonly used and often refers to a similar process but is not the primary term for chilling treatment.
- (c) Springification: This is not a standard term used in botany for this process.
- (d) All of these: This option is incorrect as not all terms listed are synonymous with the chilling treatment.

5. **Select the Correct Answer**:
- Based on the definitions and evaluations, the correct answer is (a) Vernalization.

### Final Answer:
The acquisition of ability to flower by chilling treatment is called (a) Vernalization.