Sense Organs
BIOLOGY
Are eyes enough to enjoy this natural splendour ...? Didn't you notice the picture drawn by Raju and its caption? What is your opinion about the caption? You too might have got the opportunity to enjoy such scenes from nature. What have your blissful experiences in such situations been?
— — — — —
Colourful scenes The chirping of birds The gentle pat of the breeze The intoxicating fragrance of flowers The honey-sweetness of mango
7
BIOLOGY
Though these are different experiences, can't they be felt at the same time? Can’t we hear, touch, smell and taste while seeing? Have you ever thought how this happens? You know that we get information about the changes in the environment through the sense organs. What are the sense organs we have? What is the function of each? Prepare a note on it. .....................................................................
Let us examine the parts of the eye. Make a list of those you know.
— — —
Pupil Retina
Don't you want to know how these parts are arranged in the eye? Collect the eye of an animal from the butcher shop. Identify its morphological characteristics by observing and feeling it. Prepare a note based on the indicators. ..................................................................... Indicators
— — —
Eye
Eyes enable us to see things. How are they protected? List the various means for the protection of eyes.
— — — —
Colour Shape Firmness
Position of the eyes – sockets in the skull Tears
Lysozyme, the enzyme present in tears destroys germs that enter the eyes to a certain extent.
With the help of your teacher take a cross section of the eye that has been collected by you. Making use of the features you observed and the following description write a note on the structure of the eye. Fill up the blanks in Figure 1.1.
Eye – The Window opening to Nature
The eye ball has three layers. The outermost layer is the sclera. It imparts firmness to the eye ball. The
Are eyes enough to enjoy this natural splendour ...? Didn't you notice the picture drawn by Raju and its caption? What is your opinion about the caption? You too might have got the opportunity to enjoy such scenes from nature. What have your blissful experiences in such situations been?
— — — — —
Colourful scenes The chirping of birds The gentle pat of the breeze The intoxicating fragrance of flowers The honey-sweetness of mango
7
BIOLOGY
Though these are different experiences, can't they be felt at the same time? Can’t we hear, touch, smell and taste while seeing? Have you ever thought how this happens? You know that we get information about the changes in the environment through the sense organs. What are the sense organs we have? What is the function of each? Prepare a note on it. .....................................................................
Let us examine the parts of the eye. Make a list of those you know.
— — —
Pupil Retina
Don't you want to know how these parts are arranged in the eye? Collect the eye of an animal from the butcher shop. Identify its morphological characteristics by observing and feeling it. Prepare a note based on the indicators. ..................................................................... Indicators
— — —
Eye
Eyes enable us to see things. How are they protected? List the various means for the protection of eyes.
— — — —
Colour Shape Firmness
Position of the eyes – sockets in the skull Tears
Lysozyme, the enzyme present in tears destroys germs that enter the eyes to a certain extent.
With the help of your teacher take a cross section of the eye that has been collected by you. Making use of the features you observed and the following description write a note on the structure of the eye. Fill up the blanks in Figure 1.1.
Eye – The Window opening to Nature
The eye ball has three layers. The outermost layer is the sclera. It imparts firmness to the eye ball. The