Biology [1 Mark Question Answer]

Cerebrospinal fluid

Iris

Cone cells. 

Lachrymal glands - It produces tear to lubricate the eyeball.

Retina - It prevents the reflection of light.

Three semicircular canals - It maintains the dynamic equilibrium.

Fovea centralis - It is a point at retina where more cone cells are concentrated and thus produces sharpest vision.

Cochlea - It helps in hearing by transmitting impulses to the brain through auditory nerves.

Example of a conditioned reflex: Tying one's shoe lace.

Reflex action - It is an immediate and involuntary response to a stimulus.

Reflex action - It is an immediate and involuntary response to a stimulus.
Example - 1. Blinking of eyelids on exposure to light .
2. Knee jerk.

The arrangement of neurons in
Cerebrum: cytons are present outside and axons are inside
Spinal cord: cytons are present inside and axons are outside.

Effector organs - It is located in muscle , gland or any organ of the body.

Nodes of Ranvier - It is located on the unmyelinated areas on the axon.

Cerebellum - It is located behind cerebrum and above medulla oblongata in the brain.

Ganglia - On each side of the spinal cord.

Meninges - It is located around the brain and spinal cord.

Cerebrum

Diencephalon

Power of accommodation - It is the ability of the lens to focus on far and distant objects.

Blind spot - It is the region of no image formation because of lack of cone cells.

Yellow spot - It is the region of best vision where more cone cells are present.

Reflex action - It is an immediate and involuntary response to a stimulus.

Action potential - A momentary change in electrical potential on the surface of a cell, or a nerve or muscle cell, that occurs when it is stimulated, resulting in the transmission of an electrical impulse.

Cyton - It is an oval, angular, polygonal or stellate body which contains a large central nucleus.

Axon - It is a fibre like process of the neuron which carries impulses away from the cell body.

Nerve impulse - It is an electrochemical change occurring in the membrane of a nerve fibre produced by a stimulus.

Cranial nerve

Olfactory lobe

Myelin

Blind spot

Nephron

Brain

Rhodopsin

Semicircular canal

Myopia

Sclera

Bipolar neuron

Dendrites

Sympathetic nervous system

Trigeminal nerve

Aphasia

Dura mater

Agraphia

Median fissure

Olfactory Lobes