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प्रश्न
Nocturnal animals (animals which sleep during the day and come out at night) tend to have wide pupils and lot of rods in their retinas. Suggest reasons for this.
उत्तर
Nocturnal animals, such as owls, tend to have wide pupils and several rod cells in their retina because wide pupil allow more light to enter the eyes and the rods cells in the retina are sensitive to dim light and are vital for night vision.
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संबंधित प्रश्न
Write the function of the following part of the human eye:- iris
How does the convex eye-lens differ from the ordinary convex lens made of glass?
Describe the working of the human eye with the help of the above diagram.
If you walk from a dark room into sunlight and back again into dark room, how would your pupils alter in size? What makes this happen?
Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
State the Location of:
Lacrimal gland
Choose the Odd One Out:
Choose the Odd One Out:
| Column I | Column II | ||
| 1 | Retina | a | Path way of light |
| 2 | Pupil | b | Far point comes closer |
| 3 | Ciliary muscles | c | near point moves away |
| 4 | Myopia | d | Screen of the eye |
| 5 | Hypermetropia | e | Power of accomodation |
Match the terms in column I with those in column II and write down the matching pairs.
| Column I | Column II | ||
| (i) | Conjunctiva | (a) | Viral infection |
| (ii) | Cornea | (b) | Ciliary body |
| (iii) | Choroid | (c) | Spiral-shaped |
| (iv) | Cochlea | (d) | Transparent epithelium |
| (v) | Conjunctivitis | (e) | Suspensory ligament |
| (f) | Contains melanin | ||
| (g) | Transparent but appears black |
