EASY
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Tears contain an antimicrobial enzyme called .

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Important Questions on Nervous System

EASY
Eustachian tube amplifies and transmits the vibrations of tympanum to the internal ear.
EASY
Curvature of lens increases when viewing near objects.
EASY
Membranous labyrinth in the inner ear is filled with perilymph.
MEDIUM
The process that leads to the formation of impulses in photoreceptors is :
EASY
Fill the blanks in the statement.
"Three types of cone cells are present in human eye. This is due to the chänge in _____  in the Opsin molecule"
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Observe the illustration and answer the following questions.

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Explain the role of these cells in making vision possible.

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Vitreous humor is formed from blood, and is reabsorbed by blood.
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Redraw the picture given below. Identify the name indicated and label the parts

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The part that adjusts its size as the intensity of light varies.

EASY
 How do conjunctiva and tears protect the eye?
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Find out the parts that are not related to retina from the following.
Photoreceptor, Yellow spot, Conjunctiva, Blind spot, Iris
MEDIUM

Observe the given steps related to the experience of taste and arrange them properly.

  • Impulses reach the brain through the nerves.
  • The taste detecting chemoreceptors are stimulated.
  • The substances reach the taste buds through saliva.
  • Substances responsible for taste dissolves in saliva.
  • Forms the experience of taste.
  • Impulses form in the chemical receptors.
MEDIUM

Choose between the two options to answer the question specified in the brackets for the following.

An example is illustrated below.

Example: Corolla or Calyx (Which is the miter whorl?) Answer: Calyx

Sclerotic layer or choroid layer (Which one forms the iris?) 

EASY

Redraw the picture given below. Identify the name indicated and label the parts

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The part of Retina where plenty of photoreceptors are seen.

EASY

Observe the illustration and answer the following questions.

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Name the cells (A) and (B).

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Redraw the picture given below. Identify the name indicated and label the parts

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The part refracts light rays into the eye.

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In the mammalian eye, the 'fovea' is the the center of the visual field, where:
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Observe the illustration and answer the following questions.

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How impulses are generated in these cells when light rays fall on it?

EASY

Name the following:

The layer of the eyeball that provide nourishment to the eye.

HARD
Give appropriate biological/ technical terms for the following:
The sensory organ in Cochlea.
EASY

Give one word.

The Organ of touch.