The focal length of lens increases in case of seeing distant objects.

Reflex action is fast, spontaneous and ____.

Decide which of the following sequence is correct — (a) Receptor → Effector → Sensory Nerve → Motor Nerve → Nerve Centre (b) Receptor → Nerve Centre → Motor Nerve → Sensory Nerve → Effector (c) Receptor → Sensory Nerve → Nerve Centre → Motor Nerve → Effector (d) Receptor → Motor Nerve → Effector → Sensory Nerve → Nerve Centre

Match the words of Column-A with that of Column-B and select which of the following options is correct Column-A Column-B A. CSF i. Protects Central Nervous System from mechanical injury B. Meninges ii. Helps in the formation of the myelin sheath C. Neuroglia iii. Acts as a shock absorber (a) A-(ii) B-(iii) C-(i) (b) A-(iii) B-(i) C-(ii) (c) A-(i) B-(ii) C-(iii) (d) A-(i) B-(iii) C-(ii)

Select the correct pair — (a) Sclera—Absorbs excess light within the eyeball (b) Choroid—Provides definite shape of the eyeball (c) Lens—Causes refraction of light and accomplishes accommodation (d) Retina—Holds the lens with the help of the suspensory ligaments

Name any two structural parts of Neurone

Explain the causes of Myopia and Hyperopia

Blind spot is the part of the eye devoid of light sensitive cells formed at the junction of optic nerve and retina.

Accommodation is the ability of the retina of the eye to adjust the focal length as needed.

Which of the following is not a structural feature of an Axon? (a) Node of Ranvier (b) Myelin sheath (c) Nissl granule (d) Schwann cell

What is the function of Schwann cell?

Write the names of two structural parts of axon.