Class 7 Science Chapter 2 MCQ

Human beings do not have cellulose digesting enzymes called “cellulase” but cellulose is still a very important part of human diet. It forms a major part of roughage that is essential for proper digestion.

The false feet or pseudopodia of “Amoeba” are finger-like projections that allow movement (keep on appearing and disappearing as it moves) and help to catch food particles from the surroundings.

Absorption is the odd one. It is a digestive process that occurs in small intestine. All the others are related to mouth.

The inner lining of stomach secretes mucus, hydrochloric acid and digestive juices. Out of these HCL kills any bacteria that may enter the stomach with food and makes the medium acidic. Mucus protects the stomach lining from HCL and digestive juices break down proteins in food into simpler substances.

All statements are correct. Hence, your answer will be option [D].

The pancreas is a large cream coloured gland located just below the stomach. It is connected to small intestine. Pancreatic enzymes break down food in the small intestine. When food enters the duodenum, it is deluged with pancreatic juice, which is defined as an alkaline secretion of the pancreas containing enzymes that aid in the digestion of proteins, carbohydrates and fats. As: Pancreatic proteases (such as trypsin and chymotrypsin), which help to digest proteins. Pancreatic amylase, which helps to digest sugars (carbohydrates). Pancreatic lipase, which helps to digest fat.

Small intestine is the odd one. It releases intestinal juices and is involved in digestion. All others do not take part in the digestion process.

There are four kinds of taste buds which detect sweet, salty and bitter taste. These are located in different parts of the tongue.

Assimilation means utilisation of absorbed food for the purpose of generating energy or obtaining energy through the cells. After you eat, your body breaks down food during digestion, absorbs the nutrients, and distributes them to cells during assimilation. Absorption refers the flow of digested food from the digestive system into the blood system for movement around the body. And assimilation gets the nutrients from your food to your cells where they are used for growth and repair of the all parts of the body. This occurs in the small intestine, in particular the jejunum and ileum.

The saliva breaks down the “Starch” into sugars. The digestive juices (present in the stomach) breaks down the “Protein” into simpler substances. And the bile juice plays an important role in the digestion of “Fats”.