Advertisements
Advertisements
Question
Answer the following questions briefly:
Explain how the human eye adapts itself to bright light and dim light.
Advertisements
Solution
The amount of light intering the eye is controlled by muscles of iris. The pupil become layer in less light to allow more light to goin and in bright light it consiricts to restrict the amount of light going in.
APPEARS IN
RELATED QUESTIONS
What is the function of receptors and effectors in our body?
What are the main organs of the human nervous system? Draw a labelled diagram to show the main organs of the human nervous system.
The organ A which is located inside the skull of our body is protected by a bony shell B. It is surrounded by three layers membranes C. The spaces between these layers are filled with a liquid D which protects organ A from mechanical shocks. Organ A in combination with another organ E makes up the central nervous system.
(a) What is organ A?
(b) What are B, C and D?
(c) Name the organ E.
(d) While walking barefoot, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs: A or E, is directly involved in this action?
(e) If we step out from a darkened room into bright sunlight, we close our eyes for a moment. Which of the two organs: A or E, is directly involved in this action?
State whether the following statement is true (T) or false (F):
The dermis of the skin is made up of epithelial cells.
Match the terms of column I with those of column ll
| Column l | Column ll |
| (i) Lens | (a) Adjustment of light rays |
| (ii) Lachrymal gland | (b) Vision |
| (iii) Olfactory epithelium | (c) Secretion of tear |
| (iv) Cochlea | (d) Balance of the body |
| (v) Semicircular canal | (e) Hearing |
| (vi) Eyes | (f) Smell |
Choose the correct answer.
Synapse is a close proximity of _______________
Differentiate between:
Cerebrum and Cerebellum.
Give Technical Term:
The structure which joins the two cerebral hemispheres in man.
The human nervous system is divided into ______ parts.
Identify the motor nerves.
