match the excretory products in column I and metabolic reactions during which they are produced in column II and choose the correct option. column I(excretory product) [ a. ammonia, b. Guanines, c. creatinine, d. water] column II (metabolic reaction) [(i) carbohydrate metabolism, (ii) breakdown of creatine phosphate, (iii) protein metabolism, (iv) nucleotides metabolism]

Options

A. a(iii), b(iv), c(ii), d(i)
B. a(iii), b(iv), c(i), d(ii)
C. a(i), b(ii), c(iii), d(iv)
D. a(ii), b(i), c(iv), d(iii)

Answer

To solve the question of matching excretory products with their corresponding metabolic reactions, we will analyze each product from Column I and identify the correct metabolic reaction from Column II.

### Step-by-Step Solution:

1. **Identify Ammonia:**
- Ammonia is a nitrogenous waste product that is primarily produced during the metabolism of proteins. When proteins are broken down, they release amino acids, which are then deaminated, resulting in the formation of ammonia.
- **Match:** Ammonia (a) → Protein metabolism (iii)

2. **Identify Guanines:**
- Guanine is a nucleotide that is part of the purine family. It is produced during the metabolism of nucleotides. Nucleotide metabolism involves the breakdown and synthesis of nucleotides, including purines like guanine.
- **Match:** Guanines (b) → Nucleotides metabolism (iv)

3. **Identify Creatinine:**
- Creatinine is a waste product formed from the breakdown of creatine phosphate, which is found in muscle tissue. When creatine phosphate is metabolized for energy, creatinine is produced as a byproduct.
- **Match:** Creatinine (c) → Breakdown of creatine phosphate (ii)

4. **Identify Water:**
- Water is produced as a byproduct during carbohydrate metabolism. When carbohydrates are metabolized through processes such as glycolysis and the Krebs cycle, water is generated.
- **Match:** Water (d) → Carbohydrate metabolism (i)

### Final Matching:
- a → iii (Ammonia → Protein metabolism)
- b → iv (Guanines → Nucleotides metabolism)
- c → ii (Creatinine → Breakdown of creatine phosphate)
- d → i (Water → Carbohydrate metabolism)

### Correct Option:
The correct matches are:
- a - iii
- b - iv
- c - ii
- d - i