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 death rate and birth rate of the rose plants based on the information provided.

### Step 1: Determine the initial number of plants
Dr. John started with 40 rose plants.

### Step 2: Calculate the number of plants added through reproduction
After a year, 22 more plants were added through reproduction.

### Step 3: Calculate the number of plants that died
During the experimentation, 14 plants died.

### Step 4: Calculate the total number of plants after one year
Total plants after one year = Initial plants + Plants added - Plants died
Total plants = 40 + 22 - 14 = 48 plants

### Step 5: Calculate the death rate
The death rate is calculated as:
\[ \text{Death Rate} = \frac{\text{Number of plants died}}{\text{Initial number of plants}} \times 100 \]
Substituting the values:
\[ \text{Death Rate} = \frac{14}{40} \times 100 = 35\% \]
To express this as a percentage per year:
\[ \text{Death Rate} = 0.35\% \]

### Step 6: Calculate the birth rate
The birth rate is calculated as:
\[ \text{Birth Rate} = \frac{\text{Number of plants added}}{\text{Initial number of plants}} \times 100 \]
Substituting the values:
\[ \text{Birth Rate} = \frac{22}{40} \times 100 = 55\% \]
To express this as a percentage per year:
\[ \text{Birth Rate} = 0.55\% \]

### Conclusion
Now, we can evaluate the statements:
1. The death rate is 0.35% per year. **(Correct)**
2. The birth rate is 0.55% per rose per year. **(Incorrect)**
3. The birth rate is 0.55% per year. **(Correct)**
4. The death rate is 0.35% per rose per year. **(Incorrect)**

Thus, the correct statements are 1 and 3.

### Final Answer
The correct statements are: **1 and 3.**

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