Tag: human brain and sense organs

Questions Related to human brain and sense organs

A 22 years student goes to his ophthalmologist. He has problem in reading books, because he is not able to contract his

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Suspensory ligament

  2. Pupil

  3. Iris

  4. Ciliary muscles

Show answer
Correct Option: D
Explanation:

The ciliary muscle is located in the eye and surrounds the lens. It is smooth circular muscle, that relaxes or tightens the zonules to enable the lens to change shape for focusing. When it contracts, it pulls forward, moving to a frontal portion to relax the fibers, that hold the lens in place; this process also allows it to take on a more spherical shape to provide short range focus.

Where is the image of an object formed in human eye?

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Iris

  2. Pupil

  3. Retina

  4. Cornea

Show answer
Correct Option: C
Explanation:

  • The retina is the innermost, light-sensitive layer of tissue of the eye of most vertebrates and some molluscs.
  • The optics of the eye create a focused two-dimensional image of the visual world on the retina, which translates that image into electrical neural impulses to the brain to create the visual perception.
  • The retina serving a function analogous to that of the film or image sensor in a camera. Hence, the retina  is the image of an object formed in the human eye.
So, the correct answer is 'retina'.

The part of eye responsible for its shape is

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Cornea

  2. Sclera

  3. Iris

  4. None of the above

Show answer
Correct Option: B
Explanation:

The part of the eye responsible for its shape is sclera. It is the opaque, fibrous, tough and the protective outer layer of the eye.

So, the correct answer is 'Sclera'.

Which of the following is transparent in nature?

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Conjuctiva

  2. Cornea

  3. Iris

  4. Both A and B

Show answer
Correct Option: D
Explanation:
A. Conjunctiva is a transparent membrane that lines the eyelids. It protects the delicate cornea.
B. Cornea is a transparent layer that forms the front of eyes. It is the anterior portion of sclera, a dense connective tissue which maintains the shape of eye and also protects it.
C. Iris is an opaque and pigmented structure in the eye. It controls the size of pupil and thus, regulates amount of light entering the eye.
Hence, conjunctiva and cornea are transparent. So, both options A and B are correct.
So, the correct answer is 'Both A and B'.

Anterior chamber of the eye is the space between

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Lens and iris

  2. Cornea and iris

  3. Lens and retina

  4. Cornea and lens

Show answer
Correct Option: A
Explanation:

  • The anterior chamber of the eyeball is the part of the human eye with the chamber at right.
  • The anterior chamber is the aqueous humor-filled space inside the eye between the iris and the cornea's innermost surface, the endothelium.
So, the correct option is 'lens and iris'.

Eye spot is seen in

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Chlamydomonas

  2. Ulothrix

  3. Spirogyra

  4. Polysiphonia

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Correct Option: A

Which of the following is the clean window in the sclera in front of iris ?

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. $Conjuctiva$

  2. $Pupil$

  3. $Cornea$

  4. $Choroid$

Show answer
Correct Option: A

Umbraculum, a covering on pupil is present in

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Cat

  2. Dog

  3. Camel

  4. Anableps

Show answer
Correct Option: C
Explanation:

Umbraculum is a modification of iris which serves to reduce the excessive glare in daytime. It is found in animals like camels. It is also known as corpus nigra.

So, the correct answer is optionC.

Suspensory ligaments are found in

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Brain

  2. Eye

  3. Ear

  4. Kidney

Show answer
Correct Option: B
Explanation:

Many suspensory ligaments are attached radially around the lens that serve to pull the edges of lens edges toward the outer circle of the eyeball. They maintain the relatively flat shape of the lens under normal conditions of the eye.

Largest eyes are found in

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Deer

  2. Horse

  3. Monkey

  4. Gibbon

Show answer
Correct Option: B
Explanation:

The horse has the largest eye of any land mammal. Its visual abilities are directly related to the animal's behavior and the fact that the horse is a flight animal.
Thus, the correct answer is option B.