Gas X is an active component of air. X reacts with carbon to form gas Y. Y is one of the products of ____ and _____

Options

A. respiration, combustion
B. photosynthesis, respiration
C. combustion, transpiration
D. photosynthesis, transpiration

Explanation

To solve the question step by step, we need to identify the gases involved and the processes they are associated with.

### Step-by-Step Solution:

1. **Identify Gas X:**
- The question states that Gas X is an active component of air. The primary active component of air that is essential for combustion and respiration is **oxygen (O2)**.

**Hint:** Think about the gases that are most abundant in the air and their roles in various processes.

2. **Determine the Reaction:**
- Gas X (oxygen) reacts with carbon (C). The chemical reaction can be represented as:
\[ C + O_2 \rightarrow CO_2 \]
- This reaction produces **gas Y**, which is **carbon dioxide (CO2)**.

**Hint:** Recall the basic combustion reaction where carbon reacts with oxygen to produce carbon dioxide.

3. **Identify the Processes Producing Gas Y:**
- The question asks for the processes that produce gas Y (carbon dioxide). Two common processes that produce carbon dioxide are:
- **Respiration:** In this process, organisms use oxygen to break down glucose, producing carbon dioxide as a waste product.
- **Combustion:** This process involves burning carbon-containing materials (like fossil fuels), which also produces carbon dioxide.

**Hint:** Consider biological processes (like respiration) and chemical processes (like combustion) that result in the formation of carbon dioxide.

4. **Final Answer:**
- Therefore, gas Y (carbon dioxide) is one of the products of **respiration** and **combustion**.

### Summary:
Gas X is oxygen (O2), which reacts with carbon to form gas Y, carbon dioxide (CO2). Gas Y is produced during respiration and combustion.