Grade 11 : Biology - Neural and Neural Control (Set 7)

Question 1

Bipolar neurons are specialized neurons with one axon and one dendrite. Where are they predominantly located in the human body?

Accepted Answer

A) Retina of the eye

Answer

B) Embryonic stage nervous system

Answer

C) Cerebral cortex

Answer

D) Ventral root of spinal cord

Question 2

Which ionic movement is actively driven by the sodium-potassium pump to maintain resting membrane potential across an axon?

Accepted Answer

A) 3 Na⁺ outwards and 2 K⁺ inwards

Answer

B) 3 Na⁺ inwards and 2 K⁺ outwards

Answer

C) 2 Na⁺ outwards and 3 K⁺ inwards

Answer

D) Equal influx of Na⁺ and efflux of K⁺

Question 3

During the generation of an action potential, what key event triggers depolarization of the axonal membrane?

Accepted Answer

A) Rapid influx of Na⁺ ions

Answer

B) Rapid efflux of K⁺ ions

Answer

C) Influx of Cl^- ions

Answer

D) Efflux of Na⁺ ions

Question 4

What critical role do Calcium (Ca²⁺) ions play during synaptic transmission at a chemical synapse?

Accepted Answer

B) Stimulating synaptic vesicles to fuse with the presynaptic membrane

Answer

A) Hyperpolarizing the post-synaptic membrane

Answer

C) Directly breaking down neurotransmitter molecules in the synaptic cleft

Answer

D) Blocking voltage-gated potassium channels

Question 5

Which region of the human forebrain contains centers responsible for controlling body temperature, urge for eating, and drinking?

Accepted Answer

B) Hypothalamus

Answer

A) Thalamus

Answer

C) Cerebellum

Answer

D) Medulla oblongata

Question 6

The four round swellings (lobes) present on the dorsal portion of the midbrain are collectively known as:

Accepted Answer

B) Corpora quadrigemina

Answer

A) Corpus callosum

Answer

C) Cerebral aqueduct

Answer

D) Corpus luteum

Question 7

Which structures, together with the hypothalamus, form the Limbic System involved in emotional reactions and motivation?

Accepted Answer

B) Amygdala and Hippocampus

Answer

A) Cerebellum and Pons

Answer

C) Medulla and Thalamus

Answer

D) Corpus callosum and Pineal body

Question 8

What is the correct anatomical pathway of a nerve impulse in a spinal reflex arc?

Accepted Answer

B) Receptor → Afferent neuron → CNS (Interneuron) → Efferent neuron → Effector

Answer

A) Receptor → Efferent neuron → Spinal cord → Afferent neuron → Effector

Answer

C) Effector → Afferent neuron → Spinal cord → Efferent neuron → Receptor

Answer

D) CNS → Afferent neuron → Receptor → Efferent neuron → Effector

Question 9

Why is the blind spot of the human eye incapable of image perception?

Accepted Answer

B) Photoreceptor cells (rods and cones) are completely absent at this site

Answer

A) It contains only cones and no rods

Answer

C) Light rays cannot reach this region due to thick sclera

Answer

D) It is covered completely by opaque ciliary muscles

Question 10

Which region of the retina provides the highest visual resolution (acuity) in daylight vision?

Accepted Answer

A) Fovea centralis of the macula lutea

Answer

B) Optic disc

Answer

C) Peripheral retina

Answer

D) Canal of Schlemm

Question 11

The visual photopigment rhodopsin present in rod cells is composed of which combination of molecules?

Accepted Answer

A) Opsin (a protein) and Retinal (an aldehyde of Vitamin A)

Answer

B) Opsin (a lipid) and Retinol (Vitamin C)

Answer

C) Transducin and Retinoic acid

Answer

D) Iodopsin and Beta-carotene

Question 12

In what sequence are the auditory ossicles arranged from the tympanic membrane to the oval window inside the middle ear?

Accepted Answer

B) Malleus → Incus → Stapes

Answer

A) Stapes → Incus → Malleus

Answer

C) Incus → Malleus → Stapes

Answer

D) Malleus → Stapes → Incus

Question 13

Where is the Organ of Corti, which contains auditory hair cells that act as hearing receptors, located?

Accepted Answer

A) On the basilar membrane inside the cochlea

Answer

B) Inside the semicircular canals

Answer

C) Within the Eustachian tube

Answer

D) On Reissner's membrane in scala vestibuli

Question 14

Which specialized sensory structures in the vestibular apparatus are responsible for sensing dynamic and static equilibrium?

Accepted Answer

B) Crista ampullaris and Macula

Answer

A) Organ of Corti and Tectorial membrane

Answer

C) Scala tympani and Scala vestibuli

Answer

D) Otolith and Tympanic membrane

Question 15

What is the structural function of the corpus callosum in the human brain?

Accepted Answer

A) Connecting left and right cerebral hemispheres via a thick tract of nerve fibers

Answer

B) Connecting the midbrain to the medulla oblongata

Answer

C) Connecting the pituitary gland to the hypothalamus

Answer

D) Linking the cerebellum with the spinal cord

Question 16

Saltatory conduction of nerve impulses is characteristic of which neural structure?

Accepted Answer

B) Myelinated nerve fibers jumping between Nodes of Ranvier

Answer

A) Non-myelinated nerve fibers

Answer

C) Synaptic cleft during chemical transmission

Answer

D) Dendrites lacking voltage-gated channels

Question 17

Statement I: At resting state, the axonal membrane is comparatively more permeable to potassium ions (K⁺) than to sodium ions (Na⁺).

Statement II: The resting axonal membrane is virtually impermeable to negatively charged proteins present inside the axoplasm.

Analyze both statements and select the correct option:

Accepted Answer

A) Both Statement I and Statement II are correct

Answer

B) Statement I is correct but Statement II is incorrect

Answer

C) Statement I is incorrect but Statement II is correct

Answer

D) Both Statement I and Statement II are incorrect

Question 18

What is the physiological role of the Eustachian tube in the middle ear?

Accepted Answer

B) Equalizing air pressure on both sides of the eardrum (tympanic membrane)

Answer

A) Amplifying sound vibrations before they reach the oval window

Answer

C) Secreting cerumen to trap dust and insects in the ear canal

Answer

D) Maintaining body balance during high-frequency movements

Question 19

Brain Structure	Primary Function
1. Medulla oblongata	i. Controls cardiovascular reflexes, respiration, and gastric secretions
2. Cerebellum	ii. Coordinates muscle movements and body posture
3. Thalamus	iii. Major relay center for sensory and motor signals
4. Hypothalamus	iv. Regulates body temperature and hunger urges

Which matching set correctly connects all four brain structures to their respective functions?

Accepted Answer

A) 1-i, 2-ii, 3-iii, 4-iv

Answer

B) 1-ii, 2-i, 3-iv, 4-iii

Answer

C) 1-iii, 2-iv, 3-i, 4-ii

Answer

D) 1-iv, 2-iii, 3-ii, 4-i

Question 20

1. Action potential arrives at synaptic terminal → 2. Opening of voltage-gated Ca²⁺ channels → 3. Vesicle fusion and release of neurotransmitter → 4. Neurotransmitter binding to postsynaptic membrane receptors → 5. Opening of ion channels causing postsynaptic potential

Identify whether the sequence of steps outlined for chemical synaptic transmission is correct:

Accepted Answer

A) The sequence (1 → 2 → 3 → 4 → 5) is completely correct

Answer

B) Invert steps 2 and 3

Answer

C) Invert steps 4 and 5

Answer

D) Step 1 occurs after step 3

Grade 11 : Biology - Neural and Neural Control (Set 7)