An open circulatory system is characteristic of all the following except:___________?
Show answer Hide answer
Answer: D. Cephalopoda
Explanation
Cephalopods possess a closed circulatory system unlike most other molluscs which have open systems. Blood in squids and octopuses remains enclosed within blood vessels throughout the entire circuit. This advanced closed circulatory arrangement supports their active predatory lifestyle and high metabolism. An open circulatory system allows blood to flow freely through tissue sinuses bathing organs directly. Cephalopods utilize specialized accessory branchial hearts to boost blood pressure through gills. Most molluscs like snails and clams rely on slower open circulation with a simple heart.
Marine biologists study cephalopod circulation to understand how active invertebrates evolved complex traits. High-speed jet propulsion hunting requires the efficient oxygen delivery provided by closed circulation. Veterinary and physiological research compares mollusc circulatory designs to vertebrate systems. Arthropods possess open circulatory systems where hemolymph circulates through body cavities. Gastropods like snails feature open circulatory systems with blood pooling in tissue sinuses. Pelecypods such as clams and oysters rely on open circulatory arrangements to distribute hemolymph.
Related questions
Q1. Bone collagen fibers are strengthened through the deposition of_____________?
Show answer Hide answer
Answer: A. Ca & PO4
Bone extracellular matrix and collagen fibers gain rigidity through mineralization with calcium and phosphate. These mineral ions precipitate into crystalline structures along the flexible collagen protein framework. Cal...
Q2. In which cellular location does the complete oxidation of glucose occur?
Show answer Hide answer
Answer: C. Aerobic respiration
Aerobic respiration involves the complete breakdown and oxidation of glucose into carbon dioxide and water. Oxygen serves as the final electron acceptor enabling maximum ATP energy yield per glucose molecule. This comple...
Q3. Compared to towering trees, the rate of upward water transport in other plants is____________?
Show answer Hide answer
Answer: B. 1 mh-1
In many non-woody or smaller plants the rate of upward water transport averages around one meter per hour. Xylem vessels conduct water and dissolved minerals from roots up to leaves at this measured speed. Transpiration...
Q4. In which organisms is the coelom partitioned by septa:__________?
Show answer Hide answer
Answer: B. Annelids
Annelids have a true coelom that is internally partitioned into segments by transverse cellular septa. These internal partitions divide the fluid-filled body cavity into distinct repeating body compartments. Septal divis...
Q5. Constricting rings around nematodes are formed by_____________?
Show answer Hide answer
Answer: A. Arthrobotrys
Certain predatory fungi like Arthrobotrys form specialized constricting rings to trap nematodes in soil. These microscopic fungal loops inflate rapidly when triggered by passing soil-dwelling nematodes. Once trapped the...
Q6. Mendel's findings eventually culminated in a_____________?
Show answer Hide answer
Answer: C. Scientific law
Through extensive experimental validation and universal applicability scientific findings culminate in scientific laws. Mendel's rigorous breeding experiments uncovered consistent mathematical patterns of inheritance. Th...