In ruminant stomach the rumen is the

Options

A. Largest chamber
B. Chamber having cellulose fermenting microorganisms
C. Chamber having villi with cornified surface
D. All of the above

Answer

To solve the question "In ruminant stomach the rumen is the:", we will analyze each of the given options step by step.

### Step 1: Understand the Structure of the Rumen
The rumen is the first and largest chamber of the ruminant stomach. It plays a crucial role in the digestion process of ruminants, such as cows and sheep.

**Hint:** Remember that the rumen is the largest chamber in the ruminant stomach.

### Step 2: Role of Microorganisms
The rumen is home to a diverse population of microorganisms, including bacteria, protozoa, and fungi. These microorganisms are essential for breaking down cellulose, which is a major component of plant cell walls. They ferment cellulose into simpler compounds that the ruminant can absorb.

**Hint:** Think about how ruminants digest plant material that is otherwise indigestible.

### Step 3: Absorption in the Rumen
While the primary function of the rumen is fermentation, some absorption does occur here. The rumen has a thick layer of conified surfaces that aids in the absorption of volatile fatty acids and other nutrients produced during fermentation.

**Hint:** Consider the importance of the rumen's surface structure in nutrient absorption.

### Step 4: Evaluate the Options
Now, let's evaluate the options:
- **A:** "largest chamber" - True, the rumen is indeed the largest chamber.
- **B:** "chamber having cellulose fermenting microorganisms" - True, it is populated with microorganisms that ferment cellulose.
- **C:** "chamber having villi with conifide surfaces" - True, the rumen has a specialized surface that aids in absorption.
- **D:** "all of the above" - Since all the previous statements are true, this option is also correct.

### Conclusion
Since all the statements about the rumen are accurate, the correct answer to the question is **D: all of the above**.

**Final Answer:** D. All of the above.