ICSE Class 10

General instructions: Answer all questions. Marks are shown in brackets [ ].

Objective

1. 1.
   Which region of the eye is responsible for distinct vision?

   1. A. Optic disc
   2. B. Macula/fovea/yellow spot
   3. C. Cornea
   4. D. Iris
   [1]
2. 2.
   From which of these, tears come?

   1. A. Eyeball
   2. B. Aqueous chamber
   3. C. Lachrymal glands
   4. D. Vitreous chamber
   [1]
3. 3.
   What is the primary function of the Eustachian tube?

   1. A. To amplify sound waves in the ear
   2. B. To equalize air pressure on either side of the eardrum
   3. C. To transmit nerve impulses to the brain
   4. D. To produce earwax for protection
   [1]
4. 4.
   Which is the outermost layer of the meninges?

   1. A. Pia mater
   2. B. Arachnoid mater
   3. C. Dura mater
   4. D. Subarachnoid space
   [1]
5. 5.
   The organ that helps in hearing is

   1. A. organ of Corti
   2. B. cochlea
   3. C. semicircular canals
   4. D. ear ossicles
   [1]
6. 6.
   The circular opening in the centre of iris:

   1. A. Lens
   2. B. Cornea
   3. C. Sclera
   4. D. Pupil
   [1]
7. 7.
   Which structures are present in the hindbrain?

   1. A. Cerebrum and thalamus
   2. B. Medulla oblongata and cerebellum
   3. C. Pons and midbrain
   4. D. Hypothalamus and pituitary
   [1]
8. 8.
   Which fluid is found both inside and outside the brain?

   1. A. Lymph
   2. B. Cerebrospinal fluid
   3. C. Blood plasma
   4. D. Interstitial fluid
   [1]
9. 9.
   Differentiate rod cells and cone cells on the basis of pigment:

   1. A. Rod cells contain iodopsin; cone cells contain rhodopsin.
   2. B. Rod cells contain rhodopsin; cone cells contain iodopsin.
   3. C. Both contain rhodopsin but in different concentrations.
   4. D. Neither contains pigment; they rely on external light.
   [1]
10. 10.
    Describe the structure and functions of the spinal cord. Which of the following correctly summarizes its key roles?

    1. A. Conducts reflexes below the neck, transmits sensory impulses to the brain, and relays motor responses to trunk and limb muscles.
    2. B. Produces cerebrospinal fluid, controls voluntary movements of the head, and processes visual signals.
    3. C. Acts as the primary center for memory storage, regulates heart rate, and filters sensory inputs from the skin.
    4. D. Transmits only motor impulses to the brain, coordinates balance, and generates reflexes for the entire body.
    [1]
11. 11.
    A teacher asked her students to give two examples of types of joints in the human body. Raj said: Hinge joint and ball and socket joint. Sonu said: Pivot joint and gliding joint. Lata said: Fibrous joint and heart. Abhay said: Ball and socket joint and hinge joint. Who were correct?

    1. a. Raj and Abhay.
    2. b. Lata and Sonu.
    3. c. Sonu and Raj.
    4. d. Lata and Abhay.
    [1]
12. 12.
    Which of the following helps us to distinguish colours?

    1. A. rods
    2. B. cones
    3. C. rhodopsin
    4. D. all of the above
    [1]
13. 13.
    The organ in ear that helps to maintain equilibrium is

    1. A. cochlea
    2. B. organ of Corti
    3. C. ear ossicles
    4. D. semicircular canals
    [1]
14. 14.
    From the list below, identify the odd one out and the category to which the rest belong: Aqueous humour, Vitreous humour, Iris, Central canal.

    1. A. Odd one: Iris. Category: Parts of the spinal cord.
    2. B. Odd one: Central canal. Category: Parts concerned with the eyes.
    3. C. Odd one: Vitreous humour. Category: Components of the ear.
    4. D. Odd one: Aqueous humour. Category: Parts of the brain.
    [1]
15. 15.
    The teacher asked the class to name two sensory organs. Raj said: Ears and skin. Sonu said: Ears and tongue. Lata said: Nose and liver. Abhay said: Eyes and nose. Who were correct?

    1. a. Raj and Sonu.
    2. b. Lata and Abhay.
    3. c. Raj and Abhay.
    4. d. Sonu and Abhay.
    [1]
16. 16.
    Where is the myelin sheath located, and what is its primary role?

    1. A. Inner sheath around the axon of a neuron; speeds up nerve impulse transmission.
    2. B. Outer covering of the brain; protects against physical damage.
    3. C. Surrounding the dendrites; enhances signal reception.
    4. D. Within the cell body of a neuron; stores genetic material.
    [1]
17. 17.
    Which sequence correctly represents the pathway of a nerve impulse in a reflex arc?

    1. A. Dorsal root ganglion, receptor, effector, ventral root ganglion, associated neuron
    2. B. Receptor, dorsal root ganglion, associated neuron, ventral root ganglion, effector
    3. C. Effector, ventral root ganglion, associated neuron, dorsal root ganglion, receptor
    4. D. Associated neuron, receptor, dorsal root ganglion, ventral root ganglion, effector
    [1]
18. 18.
    From the list below, identify the odd one out and the category to which the rest belong: Dendrites, Medullary sheath, Axon, spinal cord.

    1. A. Odd one: Medullary sheath. Category: Parts of the spinal cord.
    2. B. Odd one: Spinal cord. Category: Parts of neuron.
    3. C. Odd one: Axon. Category: Components of the brain.
    4. D. Odd one: Dendrites. Category: Parts of the peripheral nervous system.
    [1]
19. 19.
    Sometimes you remember a vivid picture of a dream you saw. What is the role of your eyes in this experience?

    1. A. The eyes actively capture visual images during dreaming, which are later recalled.
    2. B. The eyes send signals to the brain to create and store dream images for later recall.
    3. C. The eyes do not directly contribute, but the brain's visual cortex generates and recalls dream images.
    4. D. The eyes remain inactive, and dreams are stored in the optic nerves for later memory.
    [1]
20. 20.
    The ventral root ganglion of the spinal cord contains cell bodies of the

    1. A. sensory neuron
    2. B. intermediate neuron
    3. C. motor neuron
    4. D. association neuron
    [1]