Class X Practical: Animal Life - Sense Organ Identification (Ear and Eye)

Objective

To identify and understand the internal structure of the human ear and eye using models or charts.

Guidelines

1. Internal Structure of the Ear

1. Identification: Identify the three main parts: outer ear, middle ear, and inner ear.
2. Outer Ear: Pinna (auricle), external auditory canal.
3. Middle Ear: Tympanic membrane (eardrum), ossicles (malleus, incus, stapes), Eustachian tube.
4. Inner Ear: Cochlea (for hearing), semicircular canals (for balance), vestibule.
5. Function (Brief): Understand the basic function of each part in hearing and balance.
6. Drawing: Draw a neat, labeled diagram of the internal structure of the human ear.

2. Internal Structure of the Eye

1. Identification: Identify the main layers and structures:
   • Outer Fibrous Layer: Sclera, cornea.
   • Middle Vascular Layer (Uvea): Choroid, ciliary body, iris, pupil.
   • Inner Neural Layer: Retina (with photoreceptors, optic disc, macula lutea/fovea).
   • Lens: Biconvex, transparent structure.
   • Chambers: Anterior chamber (aqueous humor), posterior chamber (vitreous humor).
   • Muscles: Extrinsic eye muscles.
2. Function (Brief): Understand the basic function of each part in vision.
3. Drawing: Draw a neat, labeled diagram of the internal structure of the human eye.

Expected Outcome

Ability to identify and label the key internal parts of the human ear and eye, and understand their basic roles in the senses of hearing and sight.