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Neural Control and Coordination Test - 25

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Neural Control and Coordination Test - 25
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  • Question 1
    1 / -0
    The pigment found in rods is 
    Solution
    Rhodopsin is a light-sensitive receptor protein. It is a biological pigment in photoreceptor cells of the retina. It is the primary pigment found in rod photoreceptors. They are extremely sensitive to light, enabling vision in low-light conditions. 
    So, the correct answer is option A.
  • Question 2
    1 / -0
    In human, autonomic nervous system is composed of 
    Solution
    In Humans, the autonomic nervous system is composed of the sympathetic nervous system (SNS) and parasympathetic nervous system (PNS). 
    They have antagonistic (opposite) effects on the internal organs they innervate. 
    The SNS is activated during critical situations, like fight or flight responses and consists of motor neurons that stimulate skeletal muscles. PNS is activated whilst at rest, such as during food digestion after eating and it consists of motor neurons that control smooth muscles, cardiac muscles, and glands. Hence option A is correct.
  • Question 3
    1 / -0
    Aperture of an eye can be changed by
    Solution
    The term aperture represents a hole through which light enters the eye. It is known as pupil. Its size can be changed by iris. Iris is a thin circular structure in the eye. It controls the diameter and size of the pupil (aperture of the eye) and thus regulates the amount of light entering the pupil and reaching the retina.
    So, the correct answer is 'Iris'.
  • Question 4
    1 / -0
    Which part of the brain is more developed in humans?
    Solution
    The cerebrum is the largest part of the brain. In humans, the cerebrum is the largest and best-developed of the five major divisions of the brain. The cerebrum is the newest structure in the phylogenetic sense and in mammals, it is the largest and most developed, out of all known species.
  • Question 5
    1 / -0
    Pigmented layer in eye is called as
    Solution
    The retina makes up the inner layer and occupies only the posterior two-third of the eye. The retina consists of several layers of cells, including the rods and cones, the sensory cells, that respond to light. The tips of the rods and cones are embedded in a pigmented layer of cells on the back of the retina. The pigment helps prevent light from scattering in the back of the eye. 
  • Question 6
    1 / -0
    External ear is the characteristic of 
    Solution
    The ear of modern mammals consists of an external pinna or flap of skin and cartilage. The outer ear is the external portion of the ear, which consists of the pinna and external auditory meatus. It gathers sound energy and focuses it on the eardrum (tympanic membrane).
  • Question 7
    1 / -0
    The aperture controlling the light entering in the eye is called as
    Solution
    The pupil is a hole or aperture in the middle of the iris. Iris is the colored part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil. The point of exit of optic nerve from eye forms a “blind spot” in the retina. The sclera is the white and opaque outer layer of the eyeball.
  • Question 8
    1 / -0
    Nissl granules are absent in 
    Solution

    Solution:

    • Correct answer is option A 

    • Explanation for the correct option

    • The Nissl's granules are the discrete granular bodies which are different in shapes and size that found in cell body and dendrites but not the axon of neurons.
    •  They consist of RNA and polyribosomes , and stained with basic dyes mainly with methylene blue, and it shows striped like appearance to cell.
  • Question 9
    1 / -0
    Largest eyes amongst land animals is of
    Solution
    Ostriches have the biggest eyes of all land mammals. The ostrich needs large eyes for its terrestrial lifestyle sharing the savanna as it does with an alarming army of fearsome predators. It is a flightless bird with strong hindlimbs to run.
    So, the correct answer is option C.
  • Question 10
    1 / -0
    Meibomian gland are associated with 
    Solution
    The meibomian glands (or tarsal glands) are a special kind of sebaceous gland at the rim of the eyelids inside the tarsal plate, responsible for the supply of meibum, an oily substance, that prevents evaporation of the eye's tear film. Meibum prevents tear spillage onto the cheek, trapping tears between the oiled edge and the eyeball, and makes the closed lids airtight. There are approximately 50 glands on the upper eyelids and 25 glands on the lower eyelids. Dysfunctional meibomian glands often cause dry eyes.
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