Tag: biology

Questions Related to biology

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

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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

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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. $Choroid$

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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

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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

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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

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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.

Supporting cells of retina is

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

  1. Dieters cells

  2. Hensen's cells

  3. Muller cells

  4. Amacrine cells

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Correct Option: C
Explanation:

Supporting cells of the retina is Muller cells also known as Muller glia. They are a type of retinal glial cells, first recognized and described by Heinrich Muller. They are found in the vertebrate retina, which serves as support cells for the neurons of the retina.

The major function of the Müller cells is to maintain the stability of the retinal extracellular environment by regulation of K+ levels, uptake of neurotransmitters, removal of debris, storage of glycogen, electrical insulation of receptors and other neurons, and mechanical support of the neural retina. So, the correct answer is option C.

Pigmented layer in eye is called as

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

  1. Cornea

  2. Sclerotic

  3. Choroid

  4. All of the above

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Correct Option: C
Explanation:

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. 

Largest eyes amongst land animals is of

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

  1. Elephant

  2. Deer

  3. Ostrich

  4. Man

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Correct Option: C
Explanation:

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.