Life Sciences Questions and Answers – Sensory Organs – 2

This set of Life Sciences Quiz focuses on “Sensory Organs – 2”.

1. In human ear, secretion of wax is done by___________
a) Cochlea
b) Vestibule
c) Basilar membrane
d) Ceruminous glands
View Answer

Answer: 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.

2. Human ear converts sound energy to mechanical energy which is transmitted to the brain through nerve impulse.
a) True
b) False
View Answer

Answer: 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.

3. 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: 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.

4. Name the light absorbing pigment present in the Rods?
a) Neuroglia
b) Aqueous humor
c) Rhodopsin
d) Perikaryon
View Answer

Answer: c
Explanation: The light absorbing pigment present in the rods is rhodopsin and it is also a G-protein coupled receptor which upon activation activates transducin.

5. Name the G- protein, which takes part in vision?
a) Ethylene
b) Adenosine
c) Acetylcholine
d) Transducin
View Answer

Answer: 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.

6. What is the absorption peak of green absorbing cones?
a) 565 nm
b) 535 nm
c) 768 nm
d) 440 nm
View Answer

Answer: 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.

7. 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: 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.

8. Name the tiny bone of the middle ear, which convert sound into vibration?
a) Stapes
b) Malleus
c) Incus
d) Anvil
View Answer

Answer: 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.

Sanfoundry Global Education & Learning Series – Life Sciences.


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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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