Which of the following is absent in plants?

Which of the following systems are involved in the regulation and coordination of the human body?
$I -$ Digestive system
$II -$ Endocrine system
$III -$ Excretory system
$IV -$ Nervous system
$V -$ Reproductive system

Receptors which are sensitive to pain are known as

The ability to perceive a stimulus and enter a state of activity is a property of a nerve fiber. It is called:

Which set of vitamins is considered neurotropic (essential for nervous system health)?

$A-$ Humans can sense changes in the environment.
$R-$ Sensory organs detect all types of changes in environment.