By taxonomic keys we can observe or analyse the characters of not only one member but also of the other related members because at a time couplets are used in keys in which acceptance of only one and rejection of the other character is there. This practice in taxonomic keys prove which of the following assessment most effectively?

Options

A. In keys characters are used in pairs (couplet)
B. In keys two opposite options are used for every member at a time
C. Keys are generally analytical in nature
D. Keys are able to explain about nonlivings also

Answer

To solve the question regarding the effectiveness of taxonomic keys, we need to analyze the options provided and determine which assessment is most accurately represented by the use of couplets in taxonomic keys. Here's a step-by-step breakdown:

### Step 1: Understand the Concept of Taxonomic Keys
Taxonomic keys are tools used in biology to identify and classify organisms based on their characteristics. They typically present a series of choices (couplets) that lead the user to the correct identification of an organism.

**Hint:** Remember that taxonomic keys help in distinguishing between different species based on their traits.

### Step 2: Analyze the Use of Couplets
In taxonomic keys, couplets are pairs of contrasting statements or characteristics. The user must choose one statement over the other, which helps narrow down the identification process.

**Hint:** Focus on how the use of contrasting pairs aids in decision-making during classification.

### Step 3: Evaluate Each Option
1. **In keys, characters are used in pairs or couplets.**
- This statement is true, as couplets are fundamental to the structure of taxonomic keys.

2. **In keys, two opposite options are used for every member at a time.**
- This is also true, as each couplet presents two contrasting characteristics.

3. **Keys are generally analytical in nature.**
- This statement is accurate because keys allow for the analysis of similarities and differences among organisms.

4. **Keys are able to explain about the non-living also.**
- This statement is incorrect, as taxonomic keys are primarily used for living organisms (plants and animals).

**Hint:** Compare each option against the function and structure of taxonomic keys to determine their validity.

### Step 4: Determine the Most Effective Assessment
Since the question asks for the most effective assessment of the practice in taxonomic keys, we need to identify which option best encapsulates the essence of how keys function. The third option, "Keys are generally analytical in nature," effectively summarizes the purpose of taxonomic keys, as they analyze characteristics to differentiate between organisms.

**Hint:** Look for the option that best describes the overall purpose and function of taxonomic keys.

### Conclusion
The most effective assessment of the practice in taxonomic keys is that they are generally analytical in nature, as they allow for the comparison of characteristics to identify organisms.

**Final Answer:** Keys are generally analytical in nature.