The functions of proximal and distal parts of malpighian tubules respectively are 

Options

A. absorptive and secretory
B. secretory and absorptive
C. both are absorptive
D. both are secretory

Answer

### Step-by-Step Solution:

1. **Understanding Malpighian Tubules**:
- Malpighian tubules are excretory organs found in arthropods. They play a crucial role in the elimination of waste materials from the body.

2. **Identifying the Parts**:
- Malpighian tubules consist of two main parts: the proximal part and the distal part.

3. **Function of the Proximal Part**:
- The proximal part of the Malpighian tubules is primarily responsible for absorption. It absorbs essential substances such as glucose, minerals, and some ions from the hemolymph (the fluid equivalent to blood in arthropods).

4. **Function of the Distal Part**:
- The distal part of the Malpighian tubules is mainly involved in secretion. It secretes waste products, including uric acid and other toxic substances, into the tubule for excretion.

5. **Conclusion**:
- Therefore, the functions of the proximal and distal parts of Malpighian tubules respectively are:
- Proximal: Absorptive
- Distal: Secretory

6. **Final Answer**:
- The correct answer to the question is that the proximal part is absorptive and the distal part is secretory in nature.