PSS FINAL EXAM Questions and Correct Answers 2025/2026

PSS FINAL EXAM Questions and Correct Answers 2025/2026 Characteristics of Arthropods - Answer -bilaterally symmetrical, joint appendages, they molt, exoskeleton, segmented body, open circulatory system, brain is ganglia Five Subphylums - Answer -Hexapoda (butterflies), Chelicerata (Scorpions or spiders), Myriapoda ( Millipedes), Trilobites (extinct), and crustacea (shrimp) Insect products used by humans - Answer -Silk from silk worms, food like almonds, made from chitin, red dye, and honey 4 ecological processes that require insects - Answer -pollination, soil mixing, soil formation, and recycling plant/animal material 7 level classification of binomial nomenclature - Answer -Kingdom, phylum, class, order, family, genus, species Approximate number of plants - Answer -310, 000 Approximate number of vertebrates - Answer -62,000 Approximate number of invertebrates - Answer -1.4 million How many insects described? - Answer -1 million insects described Generalized Insect Body - Answer -Head, Thorax (prothorax, mesothorax, metathorax), and abdomen-1 pair of legs attached to each segment of thorax -1 pair of wings attached to the mess and metathorax Paurometabolous metamorphosis - Answer -gradual...egg>nymph>adult -immature differs from adult Hemimetabolous metamorphosis - Answer -Incomplete, immature and adult differ considerably Holometabolous metamorphosis - Answer - complete...egg>larva>nymph>adult Diapause - Answer -The arrest of development to enhance survival of insect generations Instar - Answer -developmental stage between molts until mature. Molting - Answer -The shedding of rigid exoskeleton to help insects grow Nymph - Answer -Immature form in hemimetabolous development Larvae - Answer -immature form in hemimetabolous development Layers of integument - Answer -epicuticle, exocuticle, endocuticle, subcuticular space, basement membrane (epidermal cells) Steps of molting - Answer -Apolysis or separation of exoskeleton from epidermis> ecdysis or shedding of epi and exocuticle> molting Scientific process - Answer -Observation>hypothesis (prediction