Which of the following statements are correct?
1.Gibberellins can substitute light treat- ment
2. Gibberellins increase the yield of malt from barley grains in the brewing industry
3. Gibberellins favour flowering in long day plants
4. Gibberellins induce flowering in short day plants
Select the correct answer using the codes given below

Options

A. 1, 2, 3 and 4
B. 2 and 4
C. 1 , 3 and 4
D. 1 , 2 and 3

Answer

To determine which statements about gibberellins are correct, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement 1: Gibberellins can substitute light treatment.**
- Gibberellins are known to play a role in the process of vernalization, where they can substitute for light treatment in promoting flowering in some plants. This statement is **correct**.

2. **Statement 2: Gibberellins increase the yield of malt from barley grains in the brewing industry.**
- Gibberellins enhance the production of alpha-amylase during the germination of barley, which is crucial for malt production. Therefore, this statement is also **correct**.

3. **Statement 3: Gibberellins favor flowering in long day plants.**
- Gibberellins act as growth accelerators and promote flowering in long-day plants. This statement is **correct**.

4. **Statement 4: Gibberellins induce flowering in short day plants.**
- This statement is **incorrect**. Gibberellins do not induce flowering in short-day plants; they are more effective in promoting flowering in long-day plants.

### Conclusion:
The correct statements are 1, 2, and 3. Therefore, the correct answer is option **D: 1, 2, and 3**.