Question 1
Among the following, which is one is more vascularized and pigmented.
A. Cornea
B. Iris
C. Ciliary body
D. Choroid
View Answer
Answer: Option D
Explanation:
Choroid is highly pigmented with melanin and vascularized structure which forms the posterior region of vascular tunic. It absorbs scattered light and also supplies blood.
Question 2
Conversion of vibrations into compressed wave takes place in which part of human ear?
A. Inner ear
B. Middle ear
C. Outer ear
D. Exterior ear
View Answer
Answer: Option A
Explanation:
Ear is broadly divided into three parts that are outer, middle, and inner. Sound wave goes through the outer ear gets converted to vibration by middle ear. Passing of vibration to inner ear further converts it in the form of compresses wave.
Question 3
Human ear converts sound energy to mechanical energy which is transmitted to the brain through nerve impulse.
A. True
B. False
View Answer
Answer: Option A
Explanation:
The human ear works as a transducer which converts sound energy into mechanical energy to a nerve impulse which further detected by the brain.
Question 4
In human ear, secretion of wax is done by___________
A. Cochlea
B. Vestibule
C. Basilar membrane
D. Ceruminous glands
View Answer
Answer: Option D
Explanation:
Human ear has the number of sweat glands called ceruminous glands. These glands are present on the skin from exterior to interior part. The secretion of these glands called cerumen or wax.
Question 5
Iris is found in which layer of the eyeball?
A. Vascular tunic
B. Retina
C. Fibrous tunic
D. Microtubules
View Answer
Answer: Option A
Explanation:
Eyeball is made up of three layers, i.e., fibrous tunic, vascular tunic, and retina. The middle layer of the eyeball is a vascular tunic. It consists of three parts: ciliary body, iris, and choroid.
Question 6
Mark the INCORRECT statement about the lens?
A. Protein found in the lens are α, β, and γ crystalline
B. Composed of water and proteins
C. Mainly made up of water
D. It has a blood supply
View Answer
Answer: Option D
Explanation:
Though lens does not have a blood supply, it is active. Lens is basically made up of water and protein and many vertebrates have lens protein α, β, and γ crystalline.
Question 7
Name the G- protein, which takes part in vision?
A. Ethylene
B. Adenosine
C. Acetylcholine
D. Transducin
View Answer
Answer: Option D
Explanation:
Rhodopsin activates molecules of transducin which further activates an enzyme to break down cyclic GMP. The drop in cyclic GMP will open sodium channel which is responsible for vision.
Question 8
Name the part of the eye which produces aqueous fluid that fills the front part of the eye.
A. Ciliary body
B. Cornea
C. Vitreous humor
D. Uvea
View Answer
Answer: Option A
Explanation:
In the back locale of vascular tunic choroid end up a ciliary body. Ciliary body produces the watery liquid that fills the front piece of the eye and it is likewise situated behind the iris.
Question 9
Name the part of the eye, which is involved in focusing light on the retina?
A. Sclera
B. Iris
C. Cornea
D. Ciliary muscles
View Answer
Answer: Option C
Explanation:
Fibrous tunic is composed of anterior cornea and posterior sclera. It is a surface coating of an eyeball. Transparent cornea covered colored iris and it helps in focussing light on the retina.
Question 10
Name the tiny bone of the middle ear, which convert sound into vibration?
A. Stapes
B. Malleus
C. Incus
D. Anvil
View Answer
Answer: Option A
Explanation:
The space of the middle ear is filled with air where the tympanic membrane separates the inner and external ear. Eardrum transfer sound energy to middle ear, which in turn convert it to vibrate.
Question 11
Organs involve in the sensation of the body is known as ___________
A. Organ system
B. Muscular system
C. Nervous tissue
D. Sensory organs
View Answer
Answer: Option D
Explanation:
Those organs which include hearing, seeing, taste and smell are known as sensory organs. For ex: eye, ear, nose, skin, and tongue.
Question 12
The eyes are the most complex sense organ of the body.
A. True
B. False
View Answer
Answer: Option A
Explanation:
There are number of receptors in the eye, the lens concentrates light on these receptors which thusly made a motivation. This drive goes to the cerebrum and produces pictures.
Question 13
What is Sclera?
A. Cornea
B. White part of the eye
C. Red part of the eye
D. Lens
View Answer
Answer: Option B
Explanation:
Sclera is the white part of the eye which covers the entire eye except for cornea and is made up of collagen fibers and fibroblast.
Question 14
What is the absorption peak of green absorbing cones?
A. 565 nm
B. 535 nm
C. 768 nm
D. 440 nm
View Answer
Answer: Option B
Explanation:
The color vision of our eye is dependent on the three types of cones, i.e., green absorbing, red absorbing cones, and blue absorbing cones.
Question 15
Which of the following is known as the “window of the brain”?
A. Sensory organs
B. Cranial nerves
C. Eyes
D. Ganglia
View Answer
Answer: Option A
Explanation:
Sensory organs are considered as the “window of the brain”. When external stimuli contacted with sensory receptors, it sends signals to the brain in the form of nerve impulse which results in the sensation.
Question 16
Which of the following is NOT true for Rods?
A. Used for scotopic vision
B. Loss causes night blindness
C. Not very light sensitive
D. Confer achromatic vision
View Answer
Answer: Option C
Explanation:
Rods are very light sensitive while cons are not that much light sensitive. Cons enable us to see colors by producing sharpest images.