Following table summarises the differences between natality and mortality. Select the incorrect ones.
`{:("Natality","Mortality"),((i)"Natality is number of births per unit population per unit time.","It is number of deaths per unit population per unit time."),((ii)"It adds new individuals to the population.","It removes individuals from the population"),((iii)"It increase the size of population.","It decreases the size of population"),((iv)"It increase population density.","It reduces population density."),((v)"It is low when population size is small and high when population size is large.","It is high when population size is small and low when population size is large."):}`

Options

A. (i) and (v)
B. (iii) and (iv)
C. (iv) only
D. (v) only

Answer

To solve the question regarding the differences between natality and mortality and to identify the incorrect statements, we can follow these steps:

### Step 1: Understand the Definitions
- **Natality** refers to the number of births per unit population per unit time.
- **Mortality** refers to the number of deaths per unit population per unit time.

### Step 2: Analyze Each Statement
1. **Statement (i)**: "Natality is number of births per unit population per unit time." (Correct)
- "It is number of deaths per unit population per unit time." (Correct)

2. **Statement (ii)**: "It adds new individuals to the population." (Correct)
- "It removes individuals from the population." (Correct)

3. **Statement (iii)**: "It increases the size of population." (Correct)
- "It decreases the size of population." (Correct)

4. **Statement (iv)**: "It increases population density." (Correct)
- "It reduces population density." (Correct)

5. **Statement (v)**: "It is low when population size is small and high when population size is large." (Incorrect)
- "It is high when population size is small and low when population size is large." (Incorrect)

### Step 3: Identify the Incorrect Statements
- The fifth statement is incorrect because the rates of natality and mortality do not depend on the absolute size of the population. Instead, they are rates per unit population and can be similar regardless of population size.

### Conclusion
The incorrect statements are:
- Statement (v): "It is low when population size is small and high when population size is large." and "It is high when population size is small and low when population size is large."

Thus, the answer is option D, which corresponds to the fifth statement.

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