Life Processes in Animals Class 7 Long Question Answer

Life Processes in Animals Class 7 Long Question Answer

Life Processes in Animals Class 7 Long Question Answer

Question 1.

Explain the journey of food through the human digestive system.

Answer:

The journey of food begins in the mouth, where it is mechanically digested by teeth and mixed with saliva. It then travels down the oesophagus to the stomach, where gastric juices further break it down. The partially digested food moves into the small intestine, where nutrients are absorbed, and finally, the remaining waste passes into the large intestine before being excreted through the anus.

Question 2.

Discuss the importance of digestion in animals and how it relates to energy production.

Answer:

Digestion is essential for breaking down complex food into simpler forms that can be absorbed and utilized by the body. This process provides the necessary nutrients, such as carbohydrates, proteins, and fats, which are converted into energy. Energy is crucial for carrying out life processes, including movement, growth, and reproduction.

Question 3.

Describe the process of mechanical digestion and its significance in the digestive system.

Answer:

Mechanical digestion involves the physical breakdown of food into smaller pieces, primarily occurring in the mouth through chewing and in the stomach through churning. This process increases the surface area of food, making it easier for digestive enzymes to act on it. Effective mechanical digestion is vital for efficient nutrient absorption later in the digestive process.