Biology
When a person comes out of a cinema hall after a noon show, he experiences a dazzling effect for a short period of time. It happens due to degeneration of (P) …………… and regeneration of (Q) …………… pigments. Which of the following options is correct for P and Q ?
P - Iodopsin, Q - Rhodopsin
P - Rhodopsin, Q - Iodopsin
P - Visual violet, Q - Visual purple
P - Iodopsin, Q - Visual violet
Answer
P - Rhodopsin, Q - Iodopsin
Reason — Rhodopsin pigment is responsible for vision in low light and iodopsin pigment is responsible for vision in bright light. When we enter into bright light from low light the rhodopsin pigment bleaches (degenerates) rapidly due to intense light which causes dazzling effect.
Related Questions
The spiral organ possessing sensory cells for hearing is:
- Ampulla
- Semicircular Canal
- Vestibule
- Organ of Corti
Which of the following structures equalises the air pressure on either side of the tympanum ?
- Auditory tube
- Eustachian tube
- Vestibular canal
- Tympanic canal
Assertion. Lacrimal gland is a kind of endocrine gland which secretes an enzyme called thrombokinase.
Reason. Lacrimal gland is located in the upper outer portion of the orbit of the eye. Tears act as a lubricant and also have antiseptic property.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. Choroid layer provides nourishment to the eye and also prevents light rays form reflecting and scattering inside the eye.
Reason. Choroid layer is the outermost layer of the eyeball which surrounds the sclerotic layer. This layer contains two types of pigments-Rhodopsin and Iodopsin.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.