Explanation:

The J. Johnson Motor Educability Test is a battery of tests that are used to evaluate the motor skills of children. The test consists of various activities that assess the child's coordination, balance, and agility. The activities included in the test are:

a) Back roll
b) Front roll
c) Vertical jump
d) Stagger jump

Out of these activities, the test that is not a part of the J. Johnson Motor Educability Test is the Vertical jump. The following are the reasons why Vertical jump is not a part of the test:

• The vertical jump is not a part of the J. Johnson Motor Educability Test because it is not a skill that is essential for motor development. The test focuses on activities that are fundamental to the development of motor skills such as balance, coordination, and agility.

• The vertical jump is a skill that is more relevant for sports such as basketball and volleyball. It is not a skill that is necessary for everyday activities or for the development of motor skills.

• The J. Johnson Motor Educability Test is designed for children between the ages of 6 and 14. The vertical jump is a skill that requires a certain level of physical development and strength. Therefore, it may not be suitable for younger children who have not yet developed the necessary physical abilities.

In conclusion, out of the given options, the Vertical jump is not a part of the J. Johnson Motor Educability Test as it is not a fundamental motor skill, is more relevant for sports, and may not be suitable for younger children.