841 Tetany is caused by__________? Biology Medium Full question → A Hypocalcemia B Hypercalcemia C Clostridum tetani. D Low O2 level
842 Which of the following statement about fatigue is correct? Biology Medium Full question → A The major event in it is accumulation of lactic acid. B Lactic acid accumulation turns pH in acidic range leading to muscle ache. C Ionic imbalance may also cause it. D All of these
843 Endoskeleton is secreted by? Biology Medium Full question → A Ectoderm. B Endoderm. C Mesoderm. D All of these
844 Ecdysone is_________________? Biology Medium Full question → A An enzyme that digest endocuticle during an arthropodal ecdysis B A newly formed exoskeleton in authropods C A hormone that regulates moulting in arthropods D A process that involves moulting
845 Which of the following statement about an arthropod exoskeleton is incorrect? Biology Medium Full question → A It permits gaseous exchange B It contains joints, for the same purpose as present in human skeletal system C It provides muscle attachment D Like all the other types of exoskeleton, they lack sensation
846 Rigor mortis i.e, stiffening of body after death results from__________? Biology Medium Full question → A Accunulation of rigid proteins molecules in sarcoplam. B Unavailability of ATP, which is necessary to break the link between actin and myosin. C Decrease in body temperature after death. D Death of tissue due to unavailability of O2.
847 Exoskeleton of a marine snail is composed of________________? Biology Medium Full question → A CaPO4 B CaCO3 C CaSO4 D SiO2
848 Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction. Biology Medium Full question → A Binding sites of actin get attached to the myosin head. B Troponin uncovers the actin binding sites. C Tropomyosin gets removed from the binding sites of actin filaments. D Ca2+ goes back inside sarcoplasmic reticulum.
849 What happens during muscle contraction to the length of each myosin and action filament? Biology Medium Full question → A Z- lines get closer B A band becomes short C 1 band elongates D There is no change in sarcomere
850 Which one of the following forms the blk of exoskeleton of an arthropod? Biology Medium Full question → A Epicuticle B Procuticle C Ectocuticle D None of these
851 If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules: Biology Medium Full question → A 9 B 5 C 6 D 7
852 Which of the following statement is incorrect about Molluscans? Biology Medium Full question → A They are surrounded by single or double pieces of hard skeleton. B Their shell grows as the animal grows. C They have hydrostatic skeleton. D They move by tube feet
853 The most important function of troponin is___________? Biology Medium Full question → A To bind with actin B To bind with tropomyosin. C To bind with Ca2+ ions. D All of these
854 In an annelids, the contraction of circular muscle results in___________? Biology Medium Full question → A Lengthening of the body. B Shortening of the body. C Widening of body D Thinning of body
855 Diameter of thick filament is____________? Biology Medium Full question → A 7 nm. B 8 nm C 16nm D 10-100 ?m.
856 Which of the following animal has a hydrostatic skeleton? Biology Medium Full question → A Earthworm B Round worm C Tape worm D Pin worm
857 Single circuit heart is found in_________? Biology Medium Full question → A Fishes B Amphibians C Reptiles D Mammals
858 Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap Biology Medium Full question → A Increases. B Lowers. C Doesn’t effect. D Maintains.
859 Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper. Biology Medium Full question → A Bacteria B Viruses C Fungi D Cyanobacteria
860 Low level of CO2 favours _________ of the stomata. Biology Medium Full question → A Opening B Closure C Both of these D None of these