This is the correct option. Stomach is an organ where a major part of the digestion of food happens. Stomach secretes hydrochloric acid.

This is the correct option as this statement is false. Animals are heterotrophic in nutrition as they eat ready-made food.

This is the correct option. As Amoeba is a single celled organism, the steps in the process of nutrition are performed by the single cell.

This is the correct order. The food is first ingested through the mouth. It is then digested by breaking down in mouth cavity, stomach and small intestines. Then, the food is absorbed mainly by the small intestines. The absorbed food is then incorporated into the cell components in the process of assimilation. Lastly, the undigested food is excreted out in the process of egestion.

This is the correct option as this statement is false. Digestion in lower organisms is interacellular, whereas in higher organisms, it is extracellular.

This is the correct option. Enzymes are proteins in nature, that acting as catalysts, hasten metabolic reactions.

This is the correct option. A starfish captures small animals like worms, snails, etc with the help of its tube feet, that is present on its body.  

This is the correct option. Bacteria and minute algae are the foods of an amoeba.

This is the correct option. In amoeba, the food is ingested through pseudopodium. In hydra, food is ingested through tentacles. In butterfly, food is ingested through the feeding tube.

This is the correct order of food flow in the alimentary canal. The masticated food from mouth reaches oesophagus from where it is pushed into the stomach. In stomach, the food is churned and converted into semi-solid paste which is then pushed into small intestines. In small intestines, the food is digested and absorbed. The undigested food is further passed into large intestines, where water is absorbed from the undigested food. The undigested waste is passed into rectum, where it is stored in semi-solid faeces.

This is the correct option. Oesophagus connects the throat to the stomach. The function of oesophagus is to push the food into the stomach.

This is the correct option as masticating the food is not a function of the tongue. Mastication is the function of the teeth, not the tongue.

This is the correct option. Ingestion is the process by which food is taken in by the organisms. Digestion is the process of converting complex food substances into simpler, absorbable form. Egestion is the process by which undigested food is removed by the body.

This is the correct option. Small intestines have a number of finger-like projections that increase the surface area for absorption of digested food.

This is the correct option. Small intestine absorbs the digested food and passes it on to the blood system.

This is the correct option. Liver secretes bile juice that helps in the digestion of fats.

This is the correct option. In frog, the organ for egestion is the anus. In amoeba, the organ for egestion is the vacuoles. In hydra, the organ for egestion is the single body cavity that works both as mouth and anus.

This is the correct option. Camel is a ruminant as its stomach consist of four compartments, i.e. rumen, reticulum, omasum and abomasum. 

This is the correct option. The food enters the rumen, the largest and the first chamber. From here, the food enters reticulum that is the second chamber. From the mouth, the food is pushed directly into the third chamber called omasum. From omasum, the food enters abomasums, where digestive juices are mixed with semi-liquid food.

This is the correct option. Incisors are a narrow-edged tooth at the front of the mouth that are used for biting food. Canines are pointed teeth between the incisors and premolars and are used for tearing food. Premolars are the teeth situated inbetween the canine and the molar teeth and are used for grinding and crushing food.