Test Preparation on Neural control and coordination–II - Biology Test Series for NEET - 2020

(b) Rod is a kind of light–sensitive nerve cell present in
vertebrate retina. Rods do not discriminate fine details
or colour differences.

(c) Neuromast organs are little groups of receptor and
supporting ectodermal cells found in the lateral line canals.
Neuromast organs are current receptor or rheoreceptor
and can perceive vibration of very low frequency.

(a) Jacobson’s organ (vomeronasal organ) is concerned
with smell.

(b) A small, bipectinate chemoreceptor called osphradium
is present in the mantle cavity of Pila and is sensible to
chemical stimulus.

(d) Meissner corpuscles are specialised sense organs
situated immediately beneath epidermis in the skin.
These respond to touch and pressure.

(d) Proprioceptors are situated internally, and detect
changes in the internal environment of body.

(d) Bats produce subsonic sound which are received by ear
after being reflected by the surrounding objects. The time
taken by the echo indicates the distance of object to bat.

(c) Iris is a pigmented disc like part which is found between
cornea and lens. Iris consist of circular sphincter and
radial dilators muscles which controls the light entering
into the eye.