Adaptations to environments Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following internal anatomical adaptations enables small desert mammals, such as kangaroo rats, to maximize water conservation by excreting highly concentrated urine?

   • A) An increased density of large glomeruli that maximize initial filtration rates
   • B) A shortened proximal convoluted tubule that limits solute reabsorption
   • C) An exceptionally elongated loop of Henle extending deep into the renal medulla
   • D) A reduced number of aquaporin water channels across collecting duct membranes
2. 2.

   Which of the following physiological adaptations enables marine bony (teleost) fish to maintain water balance in their naturally hypertonic environment?

   • A) Producing copious dilute urine while actively absorbing sodium and chloride ions across their gills
   • B) Accumulating high concentrations of urea and trimethylamine oxide in blood plasma to remain isosmotic
   • C) Drinking large amounts of seawater and actively excreting excess monovalent ions across specialized gill cells
   • D) Eliminating metabolic nitrogenous waste exclusively as insoluble uric acid crystals through the cloaca
3. 3.

   Which of the following adaptations allows mangrove plants inhabiting intertidal zones to obtain sufficient oxygen for root cellular respiration in waterlogged, anoxic sediment?

   • A) Development of extensive fibrous root systems that absorb dissolved oxygen directly from saturated seawater
   • B) Specialized vertical aerial roots known as pneumatophores that facilitate atmospheric gas exchange
   • C) Rapid accumulation of high concentrations of proline in root cells to prevent oxygen diffusion outward
   • D) Secretion of active metabolic enzymes into the surrounding mud to break down water molecules into oxygen
4. 4.

   Which of the following physiological mechanisms enables endothermic animals in arctic regions to minimize conductive heat loss through their extremities?

   • A) Countercurrent heat exchange between parallel arteries and veins
   • B) Vasodilation of superficial capillaries near the skin surface
   • C) Increased surface-area-to-volume ratio in peripheral limbs
   • D) Continuous evaporative cooling along the respiratory tract
5. 5.

   Which of the following structural adaptations is most effective in reducing transpiration rates in plants adapted to arid environments?

   • A) Broad leaves with a high density of surface stomata
   • B) A thick waxy cuticle and sunken stomata
   • C) An extensive aerial root system with thin epidermal layers
   • D) Large internal air cavities and reduced vascular bundles