921. Na+ -K+ ATPase pump is important for_______________?
A. Maintenance of resting potential
B. Massive out flux of K+ after depolarization
C. Recovery of resting potential
D. Conversion of resting potential into action potential

922. Which of the following has no central nervous system?
A. Hydra
B. Man
C. Planaria
D. Cockroach

923. Maximum speed of nerve impulse transmission is____________?
A. 100 m/sec
B. 110 m/sec
C. 120m/sec
D. 130 m/sec.

924. Which of the following are responsible for the detection of changes in environment?
A. Receptors
B. Neurons
C. Effectors
D. All of these

925. Any change in the environment of an organism is called___________?
A. Stimulus
B. Variation
C. Response
D. Reaction

926. Co-ordination results in_____________?
A. Regulation of body functions
B. Organization of body functions
C. Integration of body functions
D. All of these

927. Which of the followings are effectors______________?
A. Muscles
B. Glands
C. Sensory organs
D. Both ‘a’ & ‘b’

928. Hydra has___________?
A. Brain
B. Nerves
C. Neuron-cells
D. All of these

929. Co-ordination in man is brought about by___________?
A. Nervous system
B. Endocrine system
C. Both of these
D. none of these.

930. Which of the followings is missing from the nervous system of planaria_____________?
A. Ganglia
B. Longitudinal nerves
C. Lateral nerves
D. none of these

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