The products of anaerobic respiration in yeast are :
(I) Ethanol
(II) Lactic acid
(III) Carbon dioxide
(IV) Water

Options

A. Both (I) and (II)
B. Both (II) and (III)
C. Both (II) and (IV)
D. Both (I) and (III)

Explanation

To determine the products of anaerobic respiration in yeast, we can follow these steps:

### Step 1: Understand Anaerobic Respiration
Anaerobic respiration occurs in the absence of oxygen. It is a form of respiration that allows organisms like yeast to produce energy without using oxygen.

**Hint:** Remember that anaerobic respiration is different from aerobic respiration, which requires oxygen.

### Step 2: Identify the Organism
In this case, we are focusing on yeast, a type of fungus that commonly undergoes anaerobic respiration, especially during fermentation processes.

**Hint:** Yeast is often used in baking and brewing, which is related to its anaerobic respiration.

### Step 3: Determine the Products
During anaerobic respiration in yeast, the primary products are ethanol (alcohol) and carbon dioxide. This process is known as alcoholic fermentation.

**Hint:** Think about the products that are commonly associated with fermentation in food and beverage production.

### Step 4: Eliminate Incorrect Options
From the options provided:
- (I) Ethanol - Correct
- (II) Lactic acid - Incorrect (produced in animal cells during anaerobic respiration)
- (III) Carbon dioxide - Correct
- (IV) Water - Incorrect (not a product of anaerobic respiration in yeast)

**Hint:** Consider what happens in yeast fermentation versus what happens in muscle cells during intense exercise.

### Conclusion
The correct products of anaerobic respiration in yeast are:
- (I) Ethanol
- (III) Carbon dioxide

**Final Answer:** Ethanol and Carbon Dioxide.