Question

Which of the following has the longest small intestine?
1. Herbivores
2. Carnivores
3. Omnivores
4. Autotrophs

Answer 1

Hint: The small intestine is the largest part of the alimentary tract. It is about 6.5 m long for an adult man. It is arranged within the sort of a coil in our belly. The small intestine in human beings is the location of complete digestion of food.

Complete Answer-
The length of the small intestine differs in various animals counting on the sort of food they eat.
1. Herbivorous animals like cows need a longer small intestine to allow the cellulose present in grass it eats to be digested completely. Cellulose is a carbohydrate food which is digested with difficulty and hence, takes longer time. The herbivores eat cellulose containing food like grass, peels of fruits and vegetables, green leaves, etc. So, they have a longer small intestine to digest it.
2. Carnivores are the animals which eat only other animals as food. Meat may be a food which is simpler to digest. Hence, like the herbivores, carnivorous animals like tigers, vultures, snakes, etc. have shorter small intestines.
3. Omnivores are those animals which eat both plants and animals as food. So, they also don’t have a small intestine.
4. Autotrophs are those organisms which can make their own food with the help of $CO_2$ and water and in the presence of chlorophyll and sunlight. Plants do not have digestive systems like human beings or animals. So, they do not contain any small intestines.

So, the correct option is (A) Herbivores.

Note-
The small intestine receives the secretion of two glands: liver and pancreas.
Liver secretes bile juice and pancreas secretes pancreatic juice which contains digestive enzymes which helps in the digestion of food.
Villi helps in the absorption of food from the stomach by increasing surface area in the small intestine.