Write two differences between axon and dendron.

Draw a scientific diagram of the vertical section of a human eyeball and label the following parts: [3+2=5] (a) Choroid (b) Lens (c) Cornea (d) Vitreous humour OR Draw a scientific diagram of the anaphase stage of mitotic cell division in an animal cell and label the following parts- [3+2=5] (a) Centromere (b) Daughter chromosome (c) Polar region (d) Spindle fibre

Cornea, Choroid, Lens, Aqueous humour, Iris, Vitreous humour — how many of these are refractory media of the eyeball? (a) 3 (b) 4 (c) 5 (d) 6

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.

Choose the odd one and write it: Olfactory nerve, Vagus nerve, Optic nerve, Auditory nerve

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

What is the relation between the lens and the accommodation of the eye?