CBSE Questions for Class 11 Medical Biology Neural Control And Coordination Quiz 9 - MCQExams.com

• Sclera is the external layer of eye which maintains the shape of eye and also protects it.
• Choroid is the middle layer of eye which contains many blood vessels and appears bluish in colour.
• Retina is present in the inner layer of eye. The image is perceived by brain and formed on the retina.
• Cornea is the anterior portion of eye which absorbs oxygen from the air.
• Iris surrounds the pupil and regulates the amount of light entering the eye by controlling the size of pupil. It has cells of varying colours and hence imparts colour to the eye.
• Ciliary body is a part of middle layer of eye. It consists of ciliary muscles which adjust the shape of lens.
• Conjunctiva is a thin transparent membrane lining the eyelids. 
  
• Optic nerve is the cranial nerve that carries information related to vision to the brain.

• Sclera is the external layer of eye that maintains its shape and also protects it.
• Choroid is the middle layer of eye.
• Uvea is the pigmented layer of eye that lies beneath sclera and cornea. It comprises of choroid, iris and ciliary body.
  
• Retina is the inner layer of eye that contain photoreceptor cells.

The pallium is a thick layer of the grey matter that forms the dorsal surface of the cerebrum and covers the paracoel (the lateral ventricles) like a roof.  It is highly developed in the brains of both the humans and rabbits. Paracoel is the cavity or the ventricle that is found in the cerebral cortex. It is also called the 2nd ventricle. The 1st ventricle is the rhinocoel. It is the cavity of the olfactory lobe. The cavity of the diencephalon is called the 3rd ventricle or the diocoel. The 4th ventricle is the cavity in the brain stem.

Hence, the correct answer is (A)

Correct option : (B)  X- Cell body of the motor neuron, Y -Dorsal root ganglion.

Explanation:- 

Based on various roles, the neurons are Basically divided into three types-

Sensory neuron - It brings the signal to the central nervous system to inform what happens inside and outside of the body.

Motor neuron - Gathers the information from other neurons and proceeds it for further work By giving various commands to our cells, muscles, glands.

Associated neurons - basically it makes a connection between any neuron to other neurons, found only in the central nervous system. 

Here from the picture, we can see X is sending signals or information to some cells, that's why it is a part of motor neuron but it indicates only to the cell body.

Dorsal root ganglions are the neurons that are activated by various kinds of sensory stimuli which come from various parts of our body, situated at the dorsal root of a spinal nerve. Here y indicates dorsal root ganglion.

• Inside the skull, the brain is covered by cranial meninges consisting of an outer layer called duramater, a very thin middle layer called arachnoid and an inner layer (which is in contact with the brain tissue) called piamatar.

• Rods are the photoreceptor cells that contain rhodopsin pigment and associated with scotopic vision of eye i.e. vision under low light.
• Cones are the photoreceptor cells that contain iodopsin, porpyrosin and cyanopsin pigments. These cells are associated with the daylight vision and colour vision of eyes.

• The function of our visceral organs is controlled by the sympathetic and parasympathetic nervous system. 
• Activation of the sympathetic system prepares the body for intense physical activity emergencies and stress. 
• In this case, the blood is diverted away from the visceral organ and skin.
• Whereas stimulation of the parasympathetic nerve can result in a slowing of the heart, dilation of visceral blood vessels, and increased activity of the digestive tract.