44. Which part of the eye is a muscle that regulates the size of the pupil? a. i

Question

44. Which part of the eye is a muscle that regulates the size of the pupil? a. iris b. lens c. retina d. sclera 45. It is difficult to distinguish between colors at night because a. we are seeing primarily with the cones b. rods do not adapt to the dark c. we are seeing primarily with the rods d. we are used to seeing mostly with the fovea 46. The idea that the eye contains separate receptors for red, green, and blue is known as theteory a. opponent-process b. additive color mixing c. trichromatic d. reductive color mixing 47. What is the basic function of the outer ear? a. to protect the hair cells b. to concentrate and funnel sound waves to the eardrum c. to amplify low-intensity sounds to detectable levels d. to filter out high-intensity sound waves that can be harmful 48. Laverne looks at the tongue of her friend and sees all kinds of bumps on her tongue. "Girl, she says, "you sure have a lot of_ a. olfactory receptors b. taste buds c. papillac d. taste receptors 49. The vestibular senses are concened with a. touch, pressure, temperature, and pairn b. the location of body parts in relation to the ground and to each other movement and body position c. d. your location as compared to the position of the sun 50. Jamal is trying to buy something over the phone. He asks his partner to read him his credit card number. However, when he tries to repeat it to the sales clerk on the other end of the line, he can't remember all the numbers. Jamal is coming up against a. the decay of numerical memory b. the extinction of auditory traces c. George Miller's magic number 7, plus or minus 2 d. the limits of procedural memory

Explanation / Answer

Answer- 44-(a) iris

Iris is the coloured part of the eye. It has shape like a disc. Muscles in the iris regulates the size of the pupil.Pupil constricts in bright light and dilates in dim light due to iris.

Answer- 45- (c) We are seeing primarily with the rods.

We see primarily with the rods and they detect low intensities of of light at night. So, we are not able to distinguish colours at night.

Answer- 46-(c) Trichromatic theory

Trichromatic theory is also known as the Young- Helmholtz theory of colour vision. According to this theory, the retina contains three receptors for the perception of colours. One receptor is sensitive for red, another receptor is sensitive for green and the third one is sensitive for blue colour.

Answer-47- (b) to concentrate and funnel sound waves to the eardrum

The function of hearing starts from outer ear. When a sound is originated outside the outer or external ear, the sound waves pass through the external auditory canal and strike the eardrum.

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