AP BIOLOGY

Detailed explanation-1: -Ocelli . These bumps on the top of the fly’s head are called ocelli. They are very simple eyes that pick up movement and changes in light. Many insects have ocelli to help them detect danger in areas their compound eyes cannot see.

Detailed explanation-2: -The domed shape of a compound eye puts each ommatidium at a slightly different angle than its neighbor; the more ommatidia there are, the sharper the image is. Insect eyes don’t “focus, ” but compound eyes are great for picking up motion. One source calls them “near-sighted.” To see through a compound eye, watch video.

Detailed explanation-3: -The image formed is a mosaic, and each tube contributes one piece. Insect eyes are different from ours because, about 600 million years ago, the ancestors of insects and crustaceans evolved vision separately from the ancestors of humans and other animals with backbones.

Detailed explanation-4: -Such compound eyes are termed as apposition eyes and are found in diurnal insects like bees, grasshoppers, and butterflies. Nocturnal insects like moths, fireflies, cockroaches, and beetles have superposition compound eyes.

Detailed explanation-5: -Regarding structure, the human eye possesses a single large lens whereas insect eyes have many small lenses, having one lens per eye subunit (ommatidium). Each ommatidium’s lens focuses light on a small number of photosensitive cells without making any adjustments.