Answer: Option C. -> hindbrain
:
C
The hindbrain, also called rhombencephalon, comprises pons, cerebellum, and medulla (also called the medulla oblongata). Most of the 12 cranial nerves are also found in the hindbrain. The cranial nerves are 12 pairs of nerves that pass through small holes at the base of the skull. These nerves are responsible for carrying information and connecting the brain to different parts of the body (sensory organs, motors, muscles, organs, etc.,)
Parts of Hind brain

Answer: Option D. -> Limbic system
:
D
The inner part of the cerebral hemispheres and a group of associated deep structures like amygdala , hippocampus etc. form a complex structure called the limbic lobe or limbic system. Along with the hypothalamus, it is involved in the regulation of sexual behaviour, expression of emotional reactions (excitement, pleasure, rage and fear) and motivation.

Answer: Option C. -> Central nervous system
:
C
There are two kinds of reflexes - spinal reflexes and brain reflexes. Both the reflexes are hence controlled by the central nervous system which comprises the brain and the spinal cord.
The central nervous system (CNS) controls most functions of the body and mind.
- The brain is the center of our thoughts, emotions and sensations,the interpreter of our external environment, and the origin of control over body movement.
-The spinal cord is the highway for communication between the body and the brain.
Reflex actions occur both from the brain and spinal cord. Most often these actions are mainly formed from the spinal cord. When sudden responses are required, instructions are given by the spinal cord itself.

Answer: Option A. -> Sodium
:
A
When a nerve fibre is stimulated, the permeability of membrane to Na⁺ is greatly increased at the point of stimulus (rapid influx of Na⁺) and hence polarity of membrane is reversed and now membrane is said to be depolarized.
1. The electric potential difference across the plasma membrane at that site is called action potential, which in fact termed as nerve impulse.
2. Depolarization is very rapid, so that conduction of nerve impulse along the entire length of axon occurs in fractions of second.
3. Depolarization is followed by the increase in membrane permeability of K⁺ which leads to change in polarization i.e. +ve charge outside and –ve charge inside. It is called repolarization.

Answer: Option D. -> A,B and C
:
D
The peripheral nervous system (PNS) includes the sensory pathway and the motor pathway. The PNS is also subdivided as the voluntary or Somatic nervous system and the involuntary or the Autonomic nervous systems.

Answer: Option A. -> Equilibrium
:
A
Statoreceptors are responsible for the reception of stimuli governing equilibration and orientation in space.

Answer: Option A. -> Afferent
:
A
In theperipheral nervous system, an afferent nerve fiber is the axon of an afferent sensory neuron. It is a long process extending far from thenerve cell bodythat carries nerve impulses from sensory receptors or sense organs toward thecentral nervous system.

Answer: Option C. -> Medulla ablongata
:
C
Therespiratorycenters (RCs) are located in the medulla oblongata and pons, which arepartsof the brainstem. The RCs receive controlling signals of neural, chemical and hormonal nature andcontrolthe rate and depth ofrespiratorymovements of the diaphragm and otherrespiratorymuscles.

Answer: Option D. -> All of these
:
D
In humans, nervous system it consists of two main parts, thecentral nervous system(CNS) and theperipheral nervous system(PNS). The CNS contains thebrainandspinal cord. The PNS consists mainly ofnerves, which are enclosed bundles of the long fibers oraxons, that connect the CNS to every other part of the body. The PNS is divided into a) somatic and b) autonomic nervous system.

Answer: Option B. -> Opaque lens
:
B
Acataractis a clouding of the lens in the eye leading to a decrease in vision. It can affect one or both eyes. Often it develops slowly.