Q1. Which phylum includes animals with a single opening serving as both mouth and anus?A. MolluscaB. CnidariaC. EchinodermataD. Annelida
Q2. Which feature is present in all chordates at some stage of their life cycle?A. Ventral nerve cordB. Open circulatory systemC. NotochordD. Exoskeleton
Q3. Which of the following statements about amphibians is incorrect?A. They have a three-chambered heartB. They are ectothermic animalsC. They lay amniotic eggsD. They respire through lungs, skin, and gills at different life stages
Q5. Why do amphibians undergo cutaneous respiration?A. To supplement oxygen intake through lungsB. Because they lack lungsC. To excrete nitrogenous wasteD. To regulate body temperature
Q6. Which of the following adaptations helps reptiles conserve water in dry environments?A. Thin, moist skinB. Cornified, keratinized skinC. Gills for respirationD. Secretion of ammonia as nitrogenous waste
Q7. Which of the following is a function of the water vascular system in echinoderms?A. ExcretionB. DigestionC. LocomotionD. Respiration
Q8. Which of the following statements about mollusks is correct?A. They have a segmented bodyB. They have an open circulatory system except for cephalopodsC. They possess a chitinous exoskeletonD. They have a water vascular system
Q9. Which of the following characteristics is common to both reptiles and birds?A. Presence of mammary glandsB. Possession of scalesC. Excretion of ureaD. Cold-blooded nature in all members
Q10. Which of the following statements about bony fishes is correct?A. They have a cartilaginous endoskeletonB. They possess a swim bladder for buoyancyC. They lack an operculumD. They exhibit internal fertilization in all species