← Back to Chapter
Important:
CBSE's official archive provides complete Class 10 Science
examination papers. The official archive does not consistently
tag individual questions chapter-wise, so the chapter-focused
questions below are presented separately as practice material.
Official CBSE Previous Year Papers
Life Processes – Chapter-Focused Practice
Practice Question 1
Why are life processes necessary for the survival of an organism?
Life processes such as nutrition, respiration, transportation
and excretion are necessary to obtain energy and materials,
distribute them through the body and remove metabolic wastes.
Practice Question 2
Why is photosynthesis essential for green plants?
Photosynthesis enables green plants to prepare organic food
from carbon dioxide and water using light energy.
Practice Question 3
Why are stomata important to plants?
Stomata allow gaseous exchange and also provide a major route
for loss of water vapour during transpiration.
Practice Question 4
Why is the small intestine well suited for absorption?
The small intestine has a large internal surface area with
numerous villi. These increase the area available for
absorption and are associated with a good blood supply.
Practice Question 5
Differentiate between aerobic and anaerobic respiration.
Aerobic respiration uses oxygen and generally releases more
energy.
Anaerobic pathways operate without sufficient oxygen and
produce different end products depending on the organism
or tissue.
Practice Question 6
Why are alveoli important in the human respiratory system?
Alveoli provide a large, thin-walled surface with a rich blood
supply for efficient exchange of oxygen and carbon dioxide.
Practice Question 7
Why is the left ventricle thicker than the right ventricle?
The left ventricle pumps blood to the entire body and therefore
needs to generate higher pressure than the right ventricle,
which pumps blood to the lungs.
Practice Question 8
What is the difference between xylem and phloem?
Xylem mainly transports water and dissolved minerals from
the roots to the aerial parts.
Phloem transports food and other organic solutes from
source regions to regions of use or storage.
Practice Question 9
Why is transpiration useful in plants?
Transpiration contributes to the upward movement of water
through xylem and also helps in cooling the plant.
Practice Question 10
What is the role of a nephron?
A nephron filters blood, permits selective reabsorption of
useful substances and contributes to the formation of urine.
Competency-Based Practice
Practice Question 11
A plant's stomata remain closed for a prolonged period.
Which two processes are directly affected?
Gaseous exchange is reduced and transpiration is also reduced.
Limited carbon dioxide entry can also affect photosynthesis.
Practice Question 12
A person has difficulty in pumping oxygenated blood to the
body. Which chamber of the heart is most directly associated
with this function?
The left ventricle pumps oxygenated blood into the systemic
circulation.
Practice Question 13
If xylem tissue is severely damaged, which substances will
be most directly affected in their movement?
Water and dissolved mineral movement from the roots to
aerial parts of the plant will be directly affected.
Practice Question 14
A person's kidneys are unable to adequately filter the blood.
Which life process is directly affected?
Excretion is directly affected because the kidneys are major
organs for filtering blood and removing nitrogenous wastes.
Practice Question 15
During intense exercise, oxygen supply to muscles may become
insufficient. What change can occur in respiration?
Muscle cells may increasingly rely on anaerobic respiration,
resulting in lactic acid formation.
Quick Revision Before Solving PYQs
-
Nutrition and photosynthesis.
-
Human digestive system and absorption.
-
Aerobic and anaerobic respiration.
-
Human respiratory system and alveoli.
-
Blood, heart and double circulation.
-
Xylem, phloem, transpiration and translocation.
-
Human excretory system and nephron.
-
Excretion in plants.