For the digestion of carbohydrate, protein and fat, enzymes such as amylase, trypsin and lipase are required. It is secreted into the duodenum through:

The digestion of carbohydrates, proteins, and fats requires specific enzymes that are primarily provided by the pancreas. The pancreas secretes pancreatic juice, which contains amylase for carbohydrate digestion, trypsin (secreted as inactive trypsinogen) for protein digestion, and lipase for breaking down fats [1][2]. This juice is released into the duodenum, the first part of the small intestine, through the pancreatic duct or the hepato-pancreatic duct. While bile is also secreted into the duodenum, its primary role is the emulsification of fats to facilitate lipase action, rather than providing the enzymes themselves [3]. Plasma and lymph are involved in the transport of nutrients after absorption but do not serve as the medium for secreting these digestive enzymes into the alimentary canal [2]. Therefore, pancreatic juice is the correct vehicle for these enzymes.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Activity 5.3 > p. 86
2. [2] Science-Class VII . NCERT(Revised ed 2025) > Chapter 9: Life Processes in Animals > Small Intestine > p. 126
3. [3] Science-Class VII . NCERT(Revised ed 2025) > Chapter 9: Life Processes in Animals > Small Intestine > p. 125