BI110 Final Exam Questions with Complete Solutions (Latest 2025) What is Light? - Correct Answers ✅Ultimate source of energy and information What do green alga use to gather information - Correct Answers ✅Eyespot- Light sensor to gather info What is the definition of light? - Correct Answers ✅Electromagnetic radiation that humans can detect with their eyes (400-700nm) also called photons What is a wavelength? - Correct Answers ✅Distance between two successive peaks What type of relationship is between an energy of photon and wavelength of light? - Correct Answers ✅Inverse relationship, shorter wavelengths reach earths surface and can cause damage, longer wavelengths do not tend to reach earths surface What are the three possible fates of a photon of light? - Correct Answers ✅Reflected off object Transmitted through object (colour is the result) Absorbed by object What must occur for light energy to be used? - Correct Answers ✅Light energy must be absorbed by molecules 1 / 3
BI110 Final Exam Questions with Complete Solutions (Latest 2025) called pigments, the energy of photon must MATCH the energy needed to move an electron to an excited state What is a conjugated system? - Correct Answers ✅Pigments are conjugated systems.Alternating double/single carbon bonds Delocalization of electrons What is a photoreceptor? - Correct Answers ✅Fundamental light-sensing system What is rodopsin? - Correct Answers ✅Most common photoreceptor in nature, key component of the eye that consists of a protein (opsin) that binds a pigment molecule (retinal) What is phototaxis? - Correct Answers ✅movement in response to light What is photomorphogenesis? - Correct Answers ✅The normal developmental process activated when seedlings are exposed to light Photochrome is photoreceptor in plants 2 / 3
BI110 Final Exam Questions with Complete Solutions (Latest 2025) What distinguishes the eye of a simple invertebrate from the eyespot of the green algae? - Correct Answers ✅The eye is the organ animals use to sense light, and vision requires a brain to interpret signals sent from the eye What is the Ocellus of a flatworm? - Correct Answers ✅The simplest eye Lined with up to 100 photoreceptor cells What is a compound eye? - Correct Answers ✅Eye that has several thousand light detectors; brain receives a mosaic image of the world making them extraordinarily good at detecting movement What is the single-lens eye? - Correct Answers ✅Found in most vertebrates Light enters the cornea, a lens concentrates the light and focuses it onto photoreceptor cells at retina Info is sent via the optic nerve to the brain Why is UV light harmful? - Correct Answers ✅Can prevent DNA replication, cause mutations or even skin cancer What is melanin? - Correct Answers ✅pigment used to protect cells from harmful UV light, strongly absorbs UV light
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