(a) Afferent neurons and efferent neurons
|
Afferent neurons |
Efferent neurons |
|
Afferent neuron conducts nerve impulses toward the brain or the spinal cord. |
Efferent neuron conducts nerve impulses from the brain or spinal cord to the effector organs such as muscles or glands. |
(b) Impulse conduction in a myelinated nerve fibre and an unmyelinated nerve fibre
|
|
Impulse conduction in a myelinated nerve fibre |
|
Impulse conduction in an unmyelinated nerve fibre |
|
1. |
In a myelinated nerve fibre, the action potential is conducted from one node to another. |
1. |
In an unmyelinated nerve fibre, the action potential is not conducted from node to node. It is carried along the whole length of the nerve fibre. |
|
2. |
The conduction of impulses is faster. |
2. |
The conduction of impulses is slower. |
(c) Aqueous humour and vitreous humour
|
Aqueous humour |
Vitreous humour |
|
It is a thin, watery fluid present between the cornea and the lens. |
It is a transparent gel present between the lens and the retina. |
(d) Blind spot and yellow spot
|
|
Blind spot |
|
Yellow spot |
|
1. |
Blind spot is a spot on the retina present at the point of origin of the optic nerve. |
1. |
Yellow spot is a small area on the retina present at the posterior pole of the eye, lateral to the blind spot. |
|
2. |
Photoreceptor cells are absent from this region. |
2. |
Only cones are present in this region. |
|
3. |
They are insensitive to light as both rods and cones are absent. |
3. |
They are sensitive to bright light as cones are present. |
(f) Cranial nerves and spinal nerves
|
|
Cranial nerves |
|
Spinal nerves |
|
1. |
Cranial nerves arise from the brain. |
1. |
Spinal nerves arise from the spinal cord. |
|
2. |
There are 12 pairs of cranial nerves. |
2. |
There are 31 pairs of spinal nerves. |
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
This question is important because it tests key concepts from the NCERT syllabus and is frequently asked in CBSE exams.
This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
(a) Afferent neurons and efferent neurons
Afferent neurons
Efferent neurons
Afferent neuron conducts nerve impulses toward the brain or ...
Step-by-step explanation:
• (a) Afferent neurons and efferent neurons
•
•
•
•
Stay updated with our latest educational content and study tips
Parent-Teacher Meetings (PTMs) are more than quick updates on marks — they’re a chance to build a real partnership between home and school. A good Parent-Teacher Meeting conversation helps parents see beyond grades. It opens up insights about a child’s strengths, struggles, emotions and even hidden talents. When parents participate actively, they don’t just track […]
Read More
In today’s world of endless information , knowing how to think is more important than knowing what to think . From school projects to real – life decisions , critical thinking helps students question ideas , analyze facts and form logical conclusions . But what exactly does critical thinking mean ? Simply put , it’s […]
Read More
Every student dreams of better grades , stronger focus and more study time – but the real challenge isn’t starting, it’s staying consistent . Building productive study habits is not about studying all day , it’s about studying smart . In today’s fast – paced digital world, distractions are everywhere – from endless phone notifications […]
Read More
Online gaming has rapidly become one of the most popular pastimes among children. Whether it’s multiplayer mobile games , PC adventures or console challenges , kids are spending more time than ever in the virtual world . On the surface, gaming seems entertaining and even educational – improving hand- eye coordination , teamwork and problem […]
Read More
Student Discussion
ADD NEW COMMENT