Write one function of each of the following five parts of the human eyeball: [1 × 5 = 5] (a) Cornea (b) Lens (c) Choroid (d) Vitreous humour (e) Retina OR Mention three changes occurring during the Anaphase stage of mitosis in an animal cell. Write the names of any two structural parts of the eukaryotic chromosome. [ 3 + 2 = 5]

Explain the following two terms: Ganglia and Synapse.

The two reflex actions, namely sneezing and coughing help in avoiding danger – justify the statement.

Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns COLUMN - A COLUMN - B 1. Meninges (a) Decrease in the number of digits in the legs 2. Sexual reproduction (b) Submergence of islands 3. Roller tongue (c) Centromere 4. Evolution of the horse (d) Telomere 5. Environmental problem of Sundarban (e) Protects brain and spinal cord from mechanical injury 6. Attaches chromosome with spindle fibre (f) Controlled by autosome (g) Occurs through the production of gametes and their union

Which of the following are the refractive media of the eye? (a) Cornea, aqueous humour, lens, vitreous humour (b) Retina, aqueous humour, lens, vitreous humour (c) Cornea, retina, lens, iris (d) Aqueous humour, iris, vitreous humour, cornea

The nucleated oval ____ cells occur between Medullary Sheath and Neurilemma of the axon of a neurone.

Consider the differences between hormone and nervous system mentioned below and choose which ones are correct: Hormone Nervous System I. Hormone is physical coordinator Nervous system is chemical coordinator II. The function of hormone occurs at a slow pace The function of nervous system is quick and instant III. The effect of hormone is long lasting The effect of nervous system is short lasting IV. Hormone remains unchanged after its function is over Nervous system gets destroyed after its function is over Options: (a) I, IV (b) I, III (c) II, III (d) II, IV

Choose the correct pair from the following: (a) Lens - Accomplishes accommodation by changing the curvature of its plane (b) Retina - Holds the lens with the help of the suspensory ligament (c) Cornea - Secretes aqueous humor (d) Choroid - Helps to maintain the shape of the eyeball

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

Choose the odd word and write it: Hypothalamus, Pons, Medulla Oblongata, Cerebellum

While looking at a distant object the focal length of the ocular lens increases if its curvature decreases.

Write one function each of the following five parts of a neuron: [1×5=5] (a) Dendron (b) Axon (c) Myelin Sheath (d) Schwann Cell (e) Node of Ranvier Or Write one function each of the following five parts of an eukaryotic chromosome: [1×5=5] (a) Chromatid (b) Centromere (c) Nucleolar Organizer (d) Satellite (e) Telomere