According to one vital force theory, ascent of sap is due to active pulsation of innermost layer of cortex. This theory was given by
or
In plant 'transpiration pull' theory for ascent of sap was first proposed by
(a) J.C. Bose
(b) Dixon
(c) Strasburger
(d) Sachs

Options

A. J.C. Bose
B. Dixon
C. Strasburger
D. Sachs .

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about two theories related to the ascent of sap in plants. The first theory is the "vital force theory" which states that the ascent of sap is due to the active pulsation of the innermost layer of the cortex. The second part of the question asks about the "transpirational pull" theory for the ascent of sap.

2. **Identify the Theories**:
- The "vital force theory" is associated with the active pulsation of the innermost layer of the cortex.
- The "transpirational pull" theory explains how water is pulled up through the plant due to transpiration.

3. **Recall the Contributors**:
- J.C. Bose is known for his work related to the vital force theory.
- The transpirational pull theory is often linked to the work of Dixon.

4. **Evaluate the Options**:
- (a) J.C. Bose: Correct for the vital force theory.
- (b) Dixon: Correct for the transpirational pull theory.
- (c) Strasburger: Not associated with either theory.
- (d) Sachs: Not associated with either theory.

5. **Conclusion**: The question asks for the person who proposed the vital force theory and the transpirational pull theory. J.C. Bose is credited with the vital force theory, while the transpirational pull theory is attributed to Dixon. Therefore, the correct answer for the first part of the question is (a) J.C. Bose.

### Final Answer:
(a) J.C. Bose