Class 9_Sense Organs

Which organ is responsible for balanced posture of body? Nose Tongue Eyes Ears Which part of the tongue provides bitter taste? side back central tip Which part of eye is responsible for forming an image on retina? Ciliary muscles Lens Vitreous humor Cornea Which nerve is responsible for sense of smell? Olfactory Optic Auditory Touch Where are touch receptors found in skin? Epidermis Dermis Subcutaneous Fat Which part of the ear helps to balance the body? Auditory canal Cochlea Semicircular canal Vestibule What is the function of pupil? controls eye pressure regulates amount of light entering eye works as screen focusing of lens Where are the eyes situated or located? Write the part of the skull. Match the following. Cornea and sclera are present in outer layer of eye Sclera is the white part of the eye Iris, ciliary body and choroid are middle layer of the eye Iris gives the color of the eyes Ciliary body is a muscle that adjusts the lens size Choroid is supplied with blood vessels Choroid functions to darken the inner layer of eyeballs Fill in the blanks Deficiency of Vitamin A in rod cells cause Night blindness. Deficiency of Vitamin A in cone cells cause Color Blindness. Write the names of Ear Ossicles Malleus is shaped as a axe hammer handcuffs Incus is shaped like hammer anvil stirrup Ear Ossicles are connected to each other. Write their one unique feature and one main function. Fill in the blanks Eustachian tube is present in the lower part of middle ear. It is the tube that connects the middle ear to the pharynx. This tube helps to balance air pressure in the middle ear cavity, also known as tympanic cavity. Select two answers. Cornea is transparent lens of eye transparent outer layer of eye colorful middle layer of eye not supplied with blood vessels Conjunctiva is Thin protective layer that covers cornea Thin protective layer that covers sclera Thick layer that covers the whole outer layer of eyes Fill in the blanks. Cochlea is a part of the inner ear. It is snail shaped organ that is filled with liquid. Cochlea is connected to vestibule in one side. Cochlea receives sound waves which causes the liquid inside to vibrate. This activates the auditory nerve and sends the signal to the brain. Then we get the sensation of hearing.Eardrum is an oval shaped thin membrane that separates the external ear from middle ear. It is present at the end of the auditory canal. It receives the sound waves and vibrates then sends the vibration to ear ossicles. Label the pictures. Pinna Incus Malleus Stapes Semicircular canals Cochlea Tympanic cavity Eardrum Auditory nerve