Dr. John is a botanist , he is experimenting with exotic species of rose plant Rose polyantha . He started with 40 plants, after a year 22 more plants were added thought reproduction but also 14 plants died during the experimentation .
Which of the following statements are correct ?
1. The death rate is 0.35% per year
2. The birth rate is 0.55 % per rose per year
3. The birth rate is 0.55 % per year
4. The death rate is 0.35 % per rose per year

Options

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

Answer

To solve the problem, we need to calculate the birth rate and death rate of the rose plants based on the information provided.

### Step-by-Step Solution:

1. **Identify Initial and Final Plant Numbers:**
- Initial number of plants = 40
- Number of plants added through reproduction = 22
- Number of plants that died = 14

2. **Calculate the Total Number of Plants After One Year:**
- Total plants after one year = Initial plants + Plants added - Plants died
- Total plants after one year = 40 + 22 - 14 = 48

3. **Calculate the Birth Rate:**
- Birth rate is defined as the number of live births (new plants) per initial population per year.
- Birth rate = (Number of plants added / Initial number of plants) * 100
- Birth rate = (22 / 40) * 100 = 55%
- Since the question asks for the birth rate per rose per year, we express it as 0.55 per rose per year.

4. **Calculate the Death Rate:**
- Death rate is defined as the number of deaths per initial population per year.
- Death rate = (Number of plants died / Initial number of plants) * 100
- Death rate = (14 / 40) * 100 = 35%
- Again, since the question asks for the death rate per rose per year, we express it as 0.35 per rose per year.

5. **Evaluate the Statements:**
- Statement 1: The death rate is 0.35% per year. **(Correct)**
- Statement 2: The birth rate is 0.55% per rose per year. **(Correct)**
- Statement 3: The birth rate is 0.55% per year. **(Incorrect)**
- Statement 4: The death rate is 0.35% per rose per year. **(Correct)**

### Conclusion:
The correct statements are 1, 2, and 4.