7)Sensory organs

Sensory organs like antennae, eyes (compound and simple), statocysts or balancing organs are present in members of phylum

The sensory organs detect all types of changes in the environment and send appropriate signals to

Which of the following groups have highly efficient circulatory and respiratory systems, and a complex nervous system and sensory organs ? (a) Reptiles (b) Mammals (c) Birds (d) All of these

Which of the following statements are true (A) The entire process of involuntary response to a peripheral nervous stimulation is called reflex action. (B)Information regarding changes in the environment is received by the CNS through the sensory organs which are processed and analysed. (C) Reflex action occurs without conscious effort (D) Reflex action requires the involvement of a part of the CNS (E) Signals from sensory organs goes to spinal cord via ventral root. Choose the correct options from given below:-

Reflex actions are very rapid, involuntary, stereotyped behaviours in which some kind of stimuli evoke a fast, short lived response. Select the correct option w.r.t. reflex actions Statement A : In a Knee-jerk reflex, more than one synapse is formed in the reflex path. Statement B : The afferent neurons in a reflex action transmit the impulses received from sensory organs via dorsal nerve root into CNS

Assertion:Reflex arc comprises of at least one afferent neuron, one efferent neuron and a part of PNS. Reason:The efferent neuron receivers signal from a sensory organ and transmits the impulse via a ventral nerve root into the PNS.

Sensory neurons of retina of eye are

Sensory neurons and motor neurons are inter connected in CNS by

Sensory ganglion concerned with spinal reflex is found in

In which of the following organisms, the excretory organs are correctly stated?