Which two of the below given points are known as the twin characteristics growth ?
(i) Increase in mass
(ii) Increase in number of individuals
(iii) Cellular organisation
(iv) Cellular differentiation

Options

A. (i) and (ii)
B. (i) nad (iii)
C. (ii) and (iii)
D. (iii) and (iv)

Explanation

To determine the twin characteristics of growth from the given options, we will analyze each option step by step.

### Step 1: Understand the concept of growth
Growth in biological terms refers to the increase in size, mass, or number of cells in an organism. It can occur in various forms, including an increase in the number of individuals or an increase in the mass of an individual organism.

**Hint:** Think about what growth means in a biological context.

### Step 2: Analyze the options
We have four options to consider:
1. Increase in mass
2. Increase in number of individuals
3. Cellular organization
4. Cellular differentiation

**Hint:** Consider how each option relates to the concept of growth.

### Step 3: Identify the twin characteristics
- **Increase in mass**: This refers to the growth of an individual organism, which occurs through processes like cell division and accumulation of cellular material.
- **Increase in number of individuals**: This refers to the growth of a population, which occurs through reproduction. More individuals mean a larger population over time.

**Hint:** Focus on which options directly relate to the overall growth of organisms and populations.

### Step 4: Eliminate irrelevant options
- **Cellular organization**: This refers to how cells are structured and organized within an organism, but it does not directly indicate growth.
- **Cellular differentiation**: This refers to the process by which cells become specialized for different functions, which is important for development but not a direct measure of growth.

**Hint:** Look for options that indicate a quantitative increase rather than structural changes.

### Conclusion
The two points that are known as the twin characteristics of growth are:
1. Increase in mass
2. Increase in number of individuals

These two characteristics reflect the fundamental aspects of biological growth.

**Final Answer:** (i) Increase in mass and (ii) Increase in number of individuals are the twin characteristics of growth.