241.

The black pigment in the eye which reduces the internal reflection is located in

• retina

• iris

• cornea

• sclerotic

Hearing impairment affects which part of brain?

• Frontal lobe

• Parietal lobe

• Temporal lobe

• Cerebellum

Assertion : Astigmatism is due to uneven curvature of lens.

Reason : It is treated with cylindrical lenses.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion: Rhabdome is present in Palaemon.

Reason: Rhabdome has an important role in digestion

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Given below is a table comparing the effects of sympathetic and parasympathetic nervous system
for four feature (a-d). Which one feature is correctly described

• Feature	Sympathetic nervous system	Parasympathetic nervous system
  a) Salivary glands	Stimulate Secretion	Inhibit Secretion

• b) Pupil of the eye

  Dilate

  Constricts

• c) Heart rate

  Decreases

  Increases

• d) Intestinal peristalsis

  Stimulates

  Inhibits

Examine the diagram of the two cell types A and B given below and select the correct option

     A                B

• Cell A is the rod cell found evenly all over retina

• Cell A is the cone cell more concentrated in the fovea central is

• Cell B is concerned with colour vision in bright light

• Cell A is sensitive to low light intensities

A person who shows unpredictable moods, outbursts of emotion, quarrelsome behaviour and conflicts with others is suffering from

• borderline personality disorder (BPD)

• mood disorder

• addictive disorder 

• schizophrenia.

Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that

• nerve fibre is insulated by a medullary sheath

• sodium pump starts operating only at the cyton and then continues into the nerve fibre

• neurotransmitters are released by dendrites and not by axon endings

• neurotransmitters are released by the axon endings and not by dendrites.

The total number of nitrogenous bases in human genome is estimated to be about

• 3.5 million

• 35 thousand

• 35 million

• 3.1 billion.

A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of a distant object in his case will be formed

• on the blind spot

• behind the retina

• in front of the retina

• on the yellow spot