Select the correct pair from the following.

1. Night blindness: The condition in which one is unable to detect colour.

2. Glaucoma- The excess pressure experienced in the eye.

3. ‌Conjunctivitis- The opaqueness of eye lens.

4. Xerophthalmia- No vision in in dim light

Complete the follwoing flow chart.

Based on the model, make pairs using the items from the box.

Model: Shark- Lateral line.

From the following statements, identify the correct one.

I) Touch receptors are not uniformly distributed all over the skin.

ii) Smell is experienced when the impulses from smell receptors reach the cerebellum.

‌iii) The tongue has taste buds to feel sweat, salt, sour, bitter and umami tastes.

iv) The impulses of hearing are conveyed to cerebrum through the vestibular nerve.

 a) i, ii are correct b) i, iii are correct c) i, iv are correct d) ii, ivare correct

Complete the flowchart related to the process of hearing.

Based on the curvature of the eye lens, identify the pictures showing the changes on viewing the distant and nearby objects.

A person heard a ringtone from his mobile phone, while viewing cricket  match. Suddenly he looked at his mobile. What changes occured in his eye lense and related muscles?

Fill the blank based on the relationship between the words in the first pair.

a)Optic lens becomes opaque : Cataract

Cornea becomes opaque : ...............

b)Cerebrospinal fluid : Brain tissues

.............................. : Eye tissues

c)Auditory nerve : Hearing

........................ : Body balance

A person is suffering from dryness of his cornea. Formulate any three hypothesis  on the circumstamces that may lead to this condition.

Observe the following figures and answer the questions.

‌a) Identify the picture A and B.

b) Deficiency of the pigment of which cell causes night blindness?

c) The defect of which cell causes color blindness.

Some of the parts related to the process of hearing are given beow. Write the major function of each.

a) Ear oscicles

b) Eustachian tube

c) Round window

From the following options, select the correct reason for the excess pressure inside the eye in the condition called Glaucoma. 

a) The pressure in the eye exerted by the unabsorbed blood.

b) The defect in the formation of aqueous fluid.

c) The defect in the reabsorption of aqueous fluid.

d) The excess amount of vitreous fluid.

Observe the following figures and answer the questions.

‌a) Identify the picture A and B.

b) Deficiency of the pigment of which cell causes night blindness?

c) The defect of which cell causes color blindness.

Compare the activities given in the table to identify the taste and smell and complete suitably.

Answer the following questions.

a) Which is the photoreceptor that enables colour vision? 

b) The change in aminoacids in the opsin protein has a crucial role in colour vision. Substantiate.

Analyse the following figure and answer the following questions.

a) From where the vestibular nerve receive impulses?

b) Where do the receptors that produce impulses to the auditory nerve locate?

from the following statements, identify the correct one.

I) Touch receptors are not uniformly distributed all over the skin.

ii) Smell is experienced when the impulses from smell receptors reach the cerebellum.

‌iii) The tongue has taste buds to feel sweat, salt, sour, bitter and umami tastes.

iv) The impulses of hearing are conveyed to cerebrum through the vestibular nerve.

a) i, ii are correct b) i, iii are correct c) i, iv are correct d) ii, iv are correct.

Complete the flow chart.

Select the suitable pair from the following.

1. Night blindness: The condition in which one is unable to detect colour.

2. Glaucoma- The excess pressure experienced in the eye.

3. ‌Conjunctivitis- The opaqueness of eye lens.

4. Xerophthalmia- Unable to see in dim light.

Correct the errors if any in the underlined terms in the following statements.

a) Aqueous fluid is formed from the blood.

b) Vitreous fluid is seen in the cavity between the cornea and the lens.

c) Cornea is the transparent part in front of the choroid.

d) Choroid is the layer of the eye with blood vessels.

Arrange the items in column A in accordance with the items in Column B.