Grade 11 : Biology - Neural and Neural Control (Set 6)

Question 1

Which part of a neuron is primarily responsible for receiving incoming chemical signals and transmitting them as electrical impulses toward the cell body?

Accepted Answer

B) Dendrite

Answer

A) Axon terminal

Answer

C) Axon hillock

Answer

D) Myelin sheath

Question 2

During the resting state of an axonal membrane, which mechanism actively maintains the resting membrane potential ionic gradient?

Accepted Answer

A) Sodium-potassium pump transporting $3	ext{ Na}^+$ outward for $2	ext{ K}^+$ inward

Answer

B) Sodium-potassium pump transporting $2	ext{ Na}^+$ outward for $3	ext{ K}^+$ inward

Answer

C) Passive diffusion of $	ext{Na}^+$ ions into the axoplasm

Answer

D) Active transport of $	ext{Ca}^{2+}$ ions into the synaptic cleft

Question 3

Rapid depolarization during the generation of an action potential is triggered by the opening of voltage-gated channels causing:

Accepted Answer

B) Rapid influx of $	ext{Na}^+$ ions into the axoplasm

Answer

A) Efflux of $	ext{K}^+$ ions out of the axon

Answer

C) Influx of $	ext{Cl}^-$ ions into the axoplasm

Answer

D) Efflux of $	ext{Na}^+$ ions out of the axoplasm

Question 4

What event restores the negative resting membrane potential inside the axon during the repolarization phase of an action potential?

Accepted Answer

B) Opening of voltage-gated $	ext{K}^+$ channels leading to $	ext{K}^+$ efflux

Answer

A) Influx of $	ext{Na}^+$ ions

Answer

C) Closing of all leak channels

Answer

D) Activation of acetylcholinesterase

Question 5

At a chemical synapse, where are synaptic vesicles containing neurotransmitters located prior to excitation?

Accepted Answer

C) Axon terminal (pre-synaptic knob)

Answer

A) Post-synaptic membrane

Answer

B) Synaptic cleft

Answer

D) Dendritic spine

Question 6

Upon arriving at the pre-synaptic membrane, an action potential stimulates the influx of which ion to facilitate vesicle fusion and neurotransmitter release?

Accepted Answer

C) $	ext{Ca}^{2+}$

Answer

A) $	ext{Na}^+$

Answer

B) $	ext{K}^+$

Answer

D) $	ext{Cl}^-$

Question 7

Which of the following correctly lists the cranial meninges surrounding the human brain from the outermost to innermost layer?

Accepted Answer

B) Dura mater $\rightarrow$ Arachnoid mater $\rightarrow$ Pia mater

Answer

A) Pia mater $\rightarrow$ Arachnoid mater $\rightarrow$ Dura mater

Answer

C) Arachnoid mater $\rightarrow$ Dura mater $\rightarrow$ Pia mater

Answer

D) Dura mater $\rightarrow$ Pia mater $\rightarrow$ Arachnoid mater

Question 8

Which major structure of the human brain wraps around the thalamus and forms the primary center for higher functions like learning, reasoning, and memory?

Accepted Answer

C) Cerebrum

Answer

A) Cerebellum

Answer

B) Hypothalamus

Answer

D) Medulla oblongata

Question 9

The region of the forebrain responsible for regulating body temperature, urge for eating and drinking, and releasing hypothalamic hormones is the:

Accepted Answer

B) Hypothalamus

Answer

A) Thalamus

Answer

C) Cerebellum

Answer

D) Corpus callosum

Question 10

The dorsal portion of the midbrain in humans features four rounded swellings/lobes known as:

Accepted Answer

B) Corpora quadrigemina

Answer

A) Corpus callosum

Answer

C) Pons Varolii

Answer

D) Limbic lobe

Question 11

Which region of the hindbrain possesses a highly convoluted surface to provide additional space for a large number of neurons involved in balance and muscle coordination?

Accepted Answer

C) Cerebellum

Answer

A) Pons

Answer

B) Medulla oblongata

Answer

D) Hypothalamus

Question 12

The brain stem connects the brain to the spinal cord and consists of which three major components?

Accepted Answer

B) Midbrain, Pons, Medulla oblongata

Answer

A) Thalamus, Hypothalamus, Cerebrum

Answer

C) Cerebellum, Pons, Midbrain

Answer

D) Forebrain, Midbrain, Hindbrain

Question 13

Statement I: A reflex arc provides an involuntary, quick response to a stimulus without immediate conscious thought.
Statement II: The correct sequential pathway of a spinal reflex arc is: Receptor $\rightarrow$ Afferent Neuron $\rightarrow$ Interneuron (CNS) $\rightarrow$ Efferent Neuron $\rightarrow$ Effector.

Evaluate Statements I and II regarding reflex action.

Accepted Answer

A) Both Statement I and Statement II are correct

Answer

B) Both Statement I and Statement II are incorrect

Answer

C) Statement I is correct but Statement II is incorrect

Answer

D) Statement I is incorrect but Statement II is correct

Question 14

The external coat of the human eye consists of dense connective tissue. Its anterior, transparent, non-vascular portion is called the:

Accepted Answer

B) Cornea

Answer

A) Sclera

Answer

C) Choroid

Answer

D) Retina

Question 15

The thinned-out central pit of the macula lutea on the retina where visual acuity (resolution) is highest and contains densely packed cones is the:

Accepted Answer

B) Fovea centralis

Answer

A) Optic disc

Answer

C) Blind spot

Answer

D) Ciliary body

Question 16

The light-sensitive visual pigment rhodopsin present in rod photoreceptor cells consists of which protein and Vitamin A derivative?

Accepted Answer

A) Opsin and Retinal

Answer

B) Opsin and Retinol

Answer

C) Globulin and Retinal

Answer

D) Melanin and Carotene

Question 17

What is the correct sequence of ear ossicles inside the human middle ear cavity, ordered from the tympanic membrane to the oval window?

Accepted Answer

B) Malleus $\rightarrow$ Incus $\rightarrow$ Stapes

Answer

A) Incus $\rightarrow$ Malleus $\rightarrow$ Stapes

Answer

C) Stapes $\rightarrow$ Incus $\rightarrow$ Malleus

Answer

D) Malleus $\rightarrow$ Stapes $\rightarrow$ Incus

Question 18

In the organ of Corti located within the cochlea, sensory hair cells lie on the basilar membrane. Which thin gelatinous membrane lies above these hair cells?

Accepted Answer

B) Tectorial membrane

Answer

A) Reissner's membrane

Answer

C) Tympanic membrane

Answer

D) Otolith membrane

Question 19

The vestibular apparatus located in the inner ear above the cochlea plays an essential role in body equilibrium and consists of:

Accepted Answer

A) Three semicircular canals and the Otolith organ (saccule and utricle)

Answer

B) Cochlea and Organ of Corti

Answer

C) Tympanic membrane and Eustachian tube

Answer

D) Pinna, Auditory canal, and Ear ossicles

Question 20

Which division of the autonomic nervous system is responsible for inducing 'fight-or-flight' responses during emergency situations?

Accepted Answer

B) Sympathetic nervous system

Answer

A) Parasympathetic nervous system

Answer

C) Somatic motor system

Answer

D) Central nervous system

Grade 11 : Biology - Neural and Neural Control (Set 6)