Science Test Class 7th Ch:1

The mouth breaks down the food to make it easier to swallow. This is achieved through the process of chewing, where the teeth grind and crush the food into smaller pieces. The saliva in the mouth also plays a role in breaking down the food chemically, as it contains enzymes that begin the digestion process. Once the food is broken down into smaller pieces, it can be easily swallowed and further digested in the stomach and intestines.

The mouth comes first in the digestive process. It is the starting point where food enters the body. The mouth is responsible for chewing and breaking down food into smaller pieces, making it easier to swallow and digest. From the mouth, the food travels to the rest of the digestive system, including the liver and large intestine, for further processing and absorption of nutrients. Therefore, the correct answer is mouth.

The digestion process starts from the mouth because that is where the food enters the body. In the mouth, food is broken down into smaller pieces through chewing and mixed with saliva, which contains enzymes that begin the process of breaking down carbohydrates. From the mouth, the food travels down the esophagus into the stomach and then continues through the rest of the digestive system. Therefore, it is correct to say that the digestion process starts from the mouth.

Chemical digestion refers to the process of breaking down food using enzymes. Enzymes are biological catalysts that speed up chemical reactions in the body. This process occurs in the digestive system, where enzymes break down complex molecules into simpler ones that can be absorbed by the body. Therefore, the statement that breaking down food with the use of enzymes is known as chemical digestion is true.

Bile is a fluid that is produced in the liver and stored in the gallbladder. Its main function is to aid in the digestion and absorption of fats in the small intestine. The liver continuously produces bile, which is then stored and concentrated in the gallbladder. When fatty foods are consumed, the gallbladder releases bile into the small intestine to break down the fats into smaller molecules, allowing for better absorption. Therefore, the statement that bile is produced in the liver and stored in the gallbladder to digest fats is true.

Digestion is the correct answer because it refers to the process by which food is broken down into smaller molecules that can be absorbed and used by the body. This process occurs in the digestive system, where enzymes and acids break down food into nutrients that can be transported to cells and used for energy, growth, and repair. Respiration refers to the exchange of gases in the body, circulation refers to the movement of blood and nutrients through the body, and the nervous system is responsible for transmitting signals and coordinating bodily functions.

The correct answer is the large intestine. After the small intestine, the partially digested food enters the large intestine, also known as the colon. The large intestine absorbs water and electrolytes from the remaining indigestible food matter, forming feces. It also houses beneficial bacteria that aid in the digestion of certain substances.

After the large intestine, the next organ in the digestive system is the rectum. The large intestine absorbs water and electrolytes from the remaining undigested food, and the waste material is then passed into the rectum. The rectum serves as a temporary storage site for feces before they are eliminated from the body through the anus. The uterus is not part of the digestive system and is not connected to the large intestine. The esophagus is the organ that connects the mouth to the stomach and is located before the large intestine in the digestive system.

The pink part in the diagram is the stomach. The stomach is an organ located in the upper abdomen, responsible for storing and breaking down food. It plays a crucial role in the digestion process by secreting gastric juices and enzymes that help in the breakdown of food particles. The stomach also contracts and relaxes to mix the food with these digestive juices, forming a semi-liquid substance called chyme.

The statement "Liver is not bile producing organ" is false. The liver is indeed a bile-producing organ. Bile is a greenish-yellow fluid that is produced by the liver and stored in the gallbladder. It plays a crucial role in the digestion and absorption of fats in the small intestine. The liver produces bile continuously and releases it into the bile ducts, which then transport it to the gallbladder for storage.

When food reaches the small intestine, it undergoes further digestion and absorption. The nutrients present in the food are broken down into smaller molecules and then absorbed into the bloodstream through the walls of the small intestine. This allows the nutrients to be transported to different parts of the body where they are needed for various functions. Therefore, the correct answer is "nutrients get into the blood".

The small intestine is longer than the large intestine because it is responsible for the majority of nutrient absorption in the digestive system. The small intestine is around 20 feet long in adults, while the large intestine is only about 5 feet long. The length of the small intestine allows for more surface area and time for the absorption of nutrients from digested food, while the large intestine primarily absorbs water and electrolytes. Therefore, the statement that the small intestine is longer than the large intestine is true.

The esophagus, also known as the food pipe, is important because it is responsible for the transportation of food from the mouth to the stomach. It plays a crucial role in the process of swallowing food, allowing it to pass through to the digestive system. Without the esophagus, the body would not be able to properly ingest and digest food.

The correct answer is stomach. The stomach is responsible for producing hydrochloric acid, which aids in the digestion of food. This acid helps break down proteins, kills harmful bacteria, and activates enzymes necessary for digestion. The gall bladder stores bile, which is produced by the liver and aids in the digestion of fats. The pancreas produces digestive enzymes that help break down carbohydrates, proteins, and fats. The mouth begins the digestion process by mechanically breaking down food and mixing it with saliva.

The gall bladder is a small muscular pouch responsible for storing bile. Bile is produced by the liver and stored in the gall bladder until it is needed for digestion. When food enters the small intestine, the gall bladder releases bile into the digestive system to help break down fats. Therefore, the gall bladder is the correct answer in this case.

Both chemical and mechanical digestion occur in the stomach. Chemical digestion is the process of breaking down food into smaller molecules using enzymes and acids. In the stomach, gastric juices containing hydrochloric acid and enzymes such as pepsin help break down proteins. Mechanical digestion, on the other hand, involves the physical breakdown of food into smaller pieces through actions like chewing and churning. In the stomach, muscular contractions mix and churn the food, further breaking it down into smaller particles. Therefore, both chemical and mechanical digestion play important roles in the stomach.

Carbohydrates are first digested in the mouth. When we eat food, our saliva contains an enzyme called amylase, which breaks down carbohydrates into smaller molecules. This process begins in the mouth as we chew and mix the food with saliva. The food then moves to the stomach, where digestion continues, but the primary breakdown of carbohydrates occurs in the mouth.

After absorbing the nutrients in the small intestine, they are transported through the walls of the small intestine and into the bloodstream. From there, the nutrients are carried to various cells and tissues in the body to provide energy and support various bodily functions.

The diagram shows a long, coiled structure, which is characteristic of the small intestine. The small intestine is responsible for the majority of nutrient absorption in the digestive system. It receives partially digested food from the stomach and further breaks it down with the help of digestive enzymes. Therefore, based on the characteristics of the diagram, it can be concluded that number 7 represents the small intestine.

The stomach is not considered an accessory organ because it is a primary organ involved in the digestive system. It plays a crucial role in breaking down food and mixing it with digestive juices to initiate the process of digestion. On the other hand, the esophagus, mouth, and small intestine are accessory organs that assist in the digestion process but are not directly involved in the breakdown of food.