Cattle are able to digest cellulose, a complex carbohydrate found in grass and fodder, due to the presence of cellulose degrading bacteria in their rumen. The rumen is the first compartment of the cattle`s stomach, where food is fermented and broken down. These bacteria produce enzymes called cellulases, which can break down cellulose into simpler sugars that can be absorbed and used by the cattle for energy.

Option 1 highlights the correct explanation. The presence of cellulose degrading bacteria in the rumen is crucial for the digestion of cellulose. These bacteria have the necessary enzymes to break down the complex cellulose into simpler forms, allowing cattle to extract energy from their plant-based diet.

Option 2 is incorrect, as cattle do not produce cellulose themselves. Cellulose is a structural carbohydrate found in plants, and cattle rely on bacteria to help them break it down.

Option 3 is also incorrect. While acids in the rumen do play a role in digestion, they do not directly enable the digestion of cellulose. The main function of the acids is to help break down proteins and other components of the cattle`s diet.

Option 4 is also incorrect. Prolonged retention of cellulose in the rumen would not enable its digestion. It