Question

The true stomach in cows is called as
A.Rumen
B.Abomasum
C.Lumen
D.None of the above

Answer 1

Hint:Ruminants are known to have a stomach with four different chambers, Ruminants are herbivorous animals and they obtain their nutrition from plants with the help of microbes.

Complete answer:
The ruminants have a four-chambered stomach, the four chambers are Rumen, Reticulum, omasum, abomasum, where abomasum is also known as the true stomach. Microbial actions take place in the rumen and reticulum which are together known as reticulorumen. Microbial action is important to break-down complex foods like cellulose, etc. The degraded food is then passed to the omasum and the abomasum.

Option A: Rumen is also a part of the cow's stomach but it is not the true stomach. Therefore, this is the incorrect option.

Option B: Abomasum is the only chamber that contains different enzymes, their glands, acids required for digestion in the cow, Hence it is known as the True stomach, Therefore, this is the correct option.

Option C: Lumen is small gastric pores and is not related to the cow's stomach, Therefore, this is the incorrect option.

Option D: One of the above options is correct. Therefore, this is the incorrect option.

Hence, the correct answer is Option B.

Note:
-Ruminants have this complex stomach because they need to ferment the food to obtain nutrition, They chew their food then regurgitate, and then chew the food again, this is also known as a rumination of food and the regurgitated food is known as cud.
-Cellulose and Hemicellulose in ruminants are broken down into acetic acid, propionic acid, and butyric acid.