Arrange the following fitness tests as per their time requirements in a sequential order from minimum to maximum:

(A) Walk Test (Rikli and Jones)
(B) 50 mtrs Run Test (Motor Fitness)
(C) Harvard Step Test
(D) Partial Curl Up Test (Motor Fitness)

The correct option is (B), (D), (A), (C).

To arrange these fitness tests in sequential order from minimum to maximum time requirement, we look at the standard duration specified for each test:

1. (B) 50 mtrs Run Test:
This test measures running speed and acceleration. It requires the participant to sprint 50 meters, which is completed very quickly, typically taking between 6 to 10 seconds. This has the shortest time requirement.

2. (D) Partial Curl Up Test:
This test measures abdominal strength and endurance. It is performed to a metronome beat of 20 curl-ups per minute, up to a maximum duration of 1 minute (60 seconds). Therefore, it takes about 1 minute or less.

3. (A) Walk Test (Rikli and Jones):
This is the 6-Minute Walk Test designed for older adults to assess aerobic endurance. The participant walks at their own pace for exactly 6 minutes. Thus, the test duration is 6 minutes.

4. (C) Harvard Step Test:
This cardiovascular endurance test requires the participant to step up and down on a platform for up to 5 minutes. After the exercise, heart rate measurements are taken during recovery at three specific intervals (1 to 1.5 minutes, 2 to 2.5 minutes, and 3 to 3.5 minutes post-exercise). This brings the total time requirement of the test to approximately 8.5 to 9 minutes, which is the longest of all the options.

Comparing the durations, we get:
50 mtrs Run (seconds) is less than Partial Curl Up (up to 1 minute) is less than Walk Test (6 minutes) is less than Harvard Step Test (approx. 8.5 minutes).

Thus, the correct sequence from minimum to maximum time requirement is (B), (D), (A), (C).