To solve the question regarding which pair is correctly matched, we will analyze each option provided:
1. **Auxentic cells, secretion with pH between 2 and 3**:
- Auxentic cells, also known as parietal cells, are located in the stomach. They secrete hydrochloric acid (HCl), which is responsible for maintaining the acidic environment of the stomach. The pH of gastric juice typically ranges between 2 and 3, making this option correct.
2. **Alpha cells of islets of Langerhans secretion that decrease the blood sugar level**:
- Alpha cells are found in the islets of Langerhans in the pancreas, and they secrete glucagon, which increases blood sugar levels. The hormone that decreases blood sugar levels is insulin, secreted by beta cells. Therefore, this option is incorrect.
3. **Kapha cells, digestive enzyme that hydrolyzes nucleic acid**:
- This option is incorrect as well. Kapha cells do not exist in the context described. The correct term might be "nucleases," which are enzymes that hydrolyze nucleic acids, and these enzymes are produced by the pancreas, not by Kapha cells.
4. **Sebaceous glands secretion that evaporates for cooling**:
- Sebaceous glands secrete sebum, an oily substance that helps to lubricate the skin and hair. They do not secrete sweat. The glands responsible for cooling through evaporation are sweat glands, which produce sweat. Thus, this option is also incorrect.
After analyzing all the options, we can conclude that the only correct pair is:
**Correct Answer**: Auxentic cells, secretion with pH between 2 and 3.
