BIOLOGY [1 Mark Question Answer]

In some people enough insulin is not released, as a result of which excess glucose collects in the blood and is excreted along with urine. This condition is called diabetes mellitus.

Excessive secretion of thyroxine is called hyperthyroidism.

Nearsightedness : A person who can see nearby objects clearly but distant objects look hazy, suffers from nearsightedness.
Farsightedness : A person who cannot see nearby objects clearly but can see distant objects clearly suffers from farsightedness.

A quick, automatic response to a stimulus without the involvement of the brain is called Reflex action.

The main functions of cerebrospinal fluid is to nourish the brain and protects it by absorbing shocks.

Any condition in an environment which causes an organism to react is known as stimulus.

Pancreas : All other are hormones but pancreas is an organ.

Pinna : All other are the parts of eye but Pinna is the part of ear.

Impulse : It is like an electrical signal which is transferred through a neuron.

Poking of ears and nose with sharp objects should be avoided as it may hurt us. Poking of ears with sharp objects such as hair pin or a safety pin may injure our eardrums leading to partial or total deafness. • Poking nose with sharp objects like hair pin or safety pin may hurt inner lining of the nostrils or can block the air passage.

Stimuli like heat, sound and light are detected by different receptors. Receptors are special cells that receive a stimulus from the environment. Some receptors are contained within the sense organs. These sense organs are responsible for the reception of stimuli of sight, sound, smell, taste and touch. Each sense organ is directly connected with the brain. There are five sense organs in the human body-eye, ear, nose, tongue and skin.

Medulla oblongata : It is like the stem of the brain. It emerges out from the base of the brain and joins the spinal cord to the brain. It is also called the brain stem. It controls activities, such as breathing heartbeat, coughing, sneezing and other involuntary functions necessary for life.