The region of the vertebrate eye, where the optic nerve passes out of the retina, is called the ______.

During excited stage the axonal membrane is more permeable to which ion?

Which of the following is not controlled by medulla oblongata?

Which cells are affected in case of vitamin A deficiency?

Which structure of internal ear is responsible for balance of body?

What is the term used for the stimulus of adequate strength?

Give the name of the central information processing organ of our body.

Which part of the war determines the pitch of a sound?

Give the name of the nervous tissues, which form the spinal cord.

Which cells of retina enable us to see coloured objects around us?

Rearrange the following in the correct order of involvement in electrical impulse movement - synptic knob, dendrities, cell body, axon terminal and axon. 

Nervous system and computers share certain common features. Comment in five lines. (Hint: CPU, input-output devices).

Describe the functions of limbic system?

What is the role of eustachian tube?

Why do we feel giddiness after a ride on the merry-go-round?

Explain the role of Na⁺ in the generation of action potential.

Distinguish between cranial nerve and spinal nerve in human.

Give a brief description of the neural system.

Explain parasympathetic neural system.

What do you understand by olfactory receptors?

The biology teacher asked the students to verify the Pavlov's experiment in dogs to establish the conditioned response (reflex). The class was divided into two groups. The teacher asked them to submit the reports. roup 2 did not repeat the experiment. The teacher praised group 1 and also gave another chance to group 2 students.
(i) Which experiment was performed by students?
(ii) Explain the experiment in brief.
(iii) What is conditioned reflex?
(iv) What values did group 1 exhibit?

Briefly describe the structure of the following:
(a) Brain (b) Eye (c) Ear