← Back to Chapter
Important:
The official CBSE archive contains complete Class 10 Science
question papers. Individual questions are not consistently
labelled chapter-wise there, so the questions below are provided
separately as chapter-focused practice.
Official CBSE Previous Year Papers
Class 10 Science – 2026
Open the official CBSE question-paper archive and
select the Class 10 Science paper.
Open Official 2026 Paper →
Chapter-Focused Practice
Practice Question 1
What is the usual direction of an impulse through a neuron?
Dendrite → Cell Body → Axon → Nerve Ending
Practice Question 2
What is a reflex action?
A reflex action is a rapid, automatic and usually involuntary
response to a stimulus.
Practice Question 3
What is a reflex arc?
A reflex arc is the pathway followed during a reflex response.
Receptor → Sensory Neuron → Spinal Cord
→ Motor Neuron → Effector
Practice Question 4
What are the three broad regions of the human brain?
Forebrain, midbrain and hindbrain.
Practice Question 5
What is the function of the cerebellum?
The cerebellum coordinates posture, balance and precision
of movement.
Practice Question 6
What is phototropism?
Phototropism is directional growth of a plant part in
response to light.
Practice Question 7
How does auxin help a shoot bend towards light?
Auxin becomes unequally distributed in the shoot. The
shaded side generally shows greater cell elongation,
causing the shoot to bend towards the light.
Practice Question 8
What is the difference between tropic and nastic movement?
Tropic movement is directional growth in response to a
stimulus.
Nastic movement is not dependent on the direction of the
stimulus.
Practice Question 9
Which hormone is associated with the fight-or-flight response?
Adrenaline.
Practice Question 10
What is the role of insulin?
Insulin helps regulate blood glucose concentration.
Competency-Based Practice
Practice Question 11
A person touches a hot object and immediately withdraws
the hand. Explain why the response occurs so rapidly.
The stimulus is carried through a reflex arc involving
sensory neurons, the spinal cord and motor neurons. This
provides a rapid protective response.
Practice Question 12
A plant kept near a window bends towards the light.
Identify the response and explain it.
It is phototropism. Unequal distribution of auxin causes
differential growth, resulting in bending towards the light.
Practice Question 13
A student suddenly feels frightened and experiences a
rapid heartbeat. Which hormone is likely involved?
Adrenaline is involved in preparing the body for rapid
action during stressful or threatening situations.
Practice Question 14
A person has difficulty maintaining normal blood glucose.
Which hormone should be considered first?
Insulin should be considered because it plays an important
role in regulation of blood glucose.
Practice Question 15
A plant root grows towards a region containing more water.
Name the type of movement.
This is positive hydrotropism.
Reasoning Questions
Practice Question 16
Why does the body need both nervous and hormonal coordination?
Nervous coordination provides rapid and targeted responses,
whereas hormonal coordination can regulate processes more
slowly and for longer durations.
Practice Question 17
Why can plants respond to stimuli even though they do not
have a nervous system?
Plants use chemical signals, hormones, changes in cell
growth and movements of plant parts to coordinate responses.
Practice Question 18
Why are reflex actions useful even though they may occur
without conscious thinking?
They provide rapid protective responses that can reduce
the effect of potentially harmful stimuli.
Quick Revision Before Solving Papers
-
Structure and function of a neuron.
-
Reflex action and reflex arc.
-
Major regions of the human brain.
-
Spinal cord and nervous coordination.
-
Plant hormones and their functions.
-
Phototropism, geotropism, hydrotropism and chemotropism.
-
Tropic and nastic movements.
-
Endocrine glands and important animal hormones.
-
Adrenaline, thyroxine, insulin and growth hormone.