Multiple Choice Questions

Life Processes

Updated for CBSE 2027
Board Exam Preparation
146+ Practice Questions
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Practice Questions with Answers

Total 146 questions available

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Q. 1
If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will not take place properly?
A
Absorption of vitamins
B
Fats breaking down into fatty acids and glycerol
C
Starch breaking down into sugars
D
Proteins breaking down into amino acids
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Q. 2
The major heterotrophs spread globally are
A
symbiotics
B
saprotrophs
C
parasites
D
holozoics
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Q. 3
During cellular respiration one molecule of glucose is first broken down into two molecules of ________.
A
Pyruvic acid
B
Lactic acid
C
None of the above
D
Acetic acid
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Q. 4
Normal blood pressure (Systolic / Diastoli(c) is
A
180/80 mm of Hg
B
120/80 mm of Hg
C
160/80 mm of Hg
D
120/60 mm of Hg
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Q. 5
Urine leaves the kidney through :-
A
collecting duct
B
ureter
C
Urethra
D
renal vein
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Q. 6
Principal inspiratory muscle is :-
A
Abdominal
B
External intercostal
C
Phrenic
D
Internal intercostal
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Q. 7
Autotroph is the other name of
A
algae
B
herbs
C
all of these
D
shurbs
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Q. 8
The major source of energy on earth is
A
heat energy
B
solar energy
C
animals
D
autotrophs
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Q. 9
Total amount of ATP produce in aerobic respiration
A
no ATP
B
38 ATP
C
2 ATP
D
26 ATP
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Q. 10
How many chambers does the human heart comprise?
A
Two
B
Four
C
Three
D
Five
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Q. 11
What is the summary of energy conversion in the process of photosynthesis?
A
Heat energy is converted into mechanical energy.
B
Heat energy is converted into chemical energy.
C
Light energy is converted into chemical energy.
D
Light energy is converted into mechanical energy.
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Q. 12
Which nutrient shows the highest percentage of digestion as the food passes through the digestive tract?
A
Fats
B
Carbohydrates
C
Proteins
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Q. 13
Which one of the following human organ is often called the "graveyard of RBCs" ?
A
Spleen
B
Liver
C
Gall bladder
D
Kidney
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Q. 14
What is the function of heart valves?
A
To regulate blood pressure
B
To assist in heart contraction
C
To allow blood flow in only one direction
D
To store blood
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Q. 15
Living being on which parasites resides called as
A
receptor
B
anchorage
C
host
D
ligand
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Q. 16
The food after digestion at molecular level is called as
A
glucose
B
pyruvate
C
malate
D
starch
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Q. 17
Amount of oxygen which is transported by one gram of haemoglobin is :-
A
13.4 ml
B
20 ml
C
None of these
D
1.34 ml
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Q. 18
Based on the graph, which nutrient is digested most efficiently overall?
A
Fats
B
Proteins
C
Carbohydrates
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Q. 19
The mode of nutrition in mushrooms is
A
autotrophic
B
parasitic
C
heterotrophic
D
holozoic
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Q. 20
Cold blooded animals are those animals in which:-
A
body temperature always remains constant
B
blood is cold
C
the body is cold to touch
D
the temperature of the body varies according to the temperature of the surroundings
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Q. 21
Thrombocytes are also called as
A
plasma
B
platelets
C
WBC
D
RBC
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Q. 22
A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains:
A
Complex proteins
B
Starch
C
Fats
D
Simple proteins
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Q. 23
Biological catalysts aiding in food breakdown are also referred to as:
A
enzymes
B
proteins
C
fats
D
nucleic acids
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Q. 24
What separates the upper and lower chambers of the heart?
A
Valves
B
Ventricles
C
Septum
D
Atria
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Q. 25
The given picture depicts a part of:
A
human digestive system
B
mouse digestive system
C
human respiratory system
D
mouse alimentary canal
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Q. 26
Villi present on the inner lining of the intestinal wall
A
Secretes hormones
B
Increases the surface area for absorption
C
Decreases the surface area for absorption
D
Secretes enzymes for digestion
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Q. 27
Choose the correct statements that describe arteries.
A
They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.
B
They have thick elastic walls, blood flows under low pressure, carry blood from the heart to various organs of the body.
C
They have thin walls with valves inside, blood flows under low pressure, carry blood away from the heart to various organs of the body.
D
They have thick elastic walls, blood flows under high pressure, collect blood from different organs and bring back to heart.
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Q. 28
RBCs are generally destroyed in the liver, while WBCs are destroyed in :-
A
Plasma
B
Lymph
C
Outside the blood stream
D
Inside various cells of body
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Q. 29
What role do bacteria play in digestion?
A
Breaking down carbohydrates
B
Absorbing water
C
Aiding in nutrient transport
D
Assisting in the breakdown of food and synthesis of certain vitamins
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Q. 30
On seeing good food our mouth waters. This fluid is actually
A
Enzyme
B
Hormone
C
Water
D
None of the above
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Q. 31
What is the primary goal of digestion?
A
Absorption of water
B
Breaking down large food molecules into small, water-soluble molecules
C
Transporting nutrients to the skin
D
Storing excess nutrients in the liver
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Q. 32
A patient suffering from hepatitis is advised to restrict the intake of fats and proteins and take carbohydrates only because
A
facts and proteins are not digested
B
emulsification of fat and deamination are retarded
C
Facts and proteins are complex substances.
D
carbohydrates are easy to digest
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Q. 33
The heart of a healthy man beats normally per minute
A
None
B
50-60 times
C
70-80 times
D
90-100 times
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Q. 34
Book lungs are respiratory organs of :-
A
Centipedes
B
Insects
C
Crustaceans
D
Scorpion
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Q. 35
Which of the following converts starch to glucose, proteins to amino acids, and fats to glycerol?
A
Pepsinogen
B
Bile salts
C
Gastric juice
D
Intestinal juice
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Q. 36
A person is undergoing prolonged fasting, His urine will be found to contain abnormal quantities of
A
glucose
B
fats
C
ketones
D
amino acids
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Q. 37
During respiration exchange of gases takes place in :
A
Alveoli and throat
B
Trachea and larynx
C
Alveoli of lungs
D
Throat and larynx
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Q. 38
Digestion functions are managed by the gastric glands present in the stomach wall by secreting the following:
A
hydrochloric acid, pepsin and mucus
B
sulphuric acid, pepsin, and mucus
C
hydrochloric acid, pepsin, and mucus
D
hydrochloric acid, pepsin, and malic acid
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Q. 39
Lichen is the example of _____ nutrition.
A
saprotrophism
B
parasitism
C
symbiotism
D
autotrophism
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Q. 40
Which of the following is not a 3-carbon molecule?
A
Lactic acid
B
Pyruvate
C
Ethanol
D
All of the above
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Q. 41
The breakdown of 6 carbon sugar in cell takes place by
A
glycolysis
B
none of these
C
Both (a) and (c)
D
kreb cycle
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Q. 42
The force exerted by blood against the vessel wall is termed:
A
ventricular pressure
B
blood pressure
C
atrial pressure
D
septal pressure
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Q. 43
Choose the function of pancreatic juice from the following.
A
Trypsin digests proteins and lipase digests carbohydrates.
B
Trypsin digests emulsified fats and lipase digests proteins.
C
Trypsin and lipase digest fats.
D
Trypsin digests proteins and lipase digests emulsified fats.
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Q. 44
What are the solid organs involved in digestion?
A
Mouth and oesophagus
B
Pancreas, liver, and gallbladder
C
Small and large intestines
D
Stomach and anus
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Q. 45
Which of the following have thickest wall?
A
Right ventricle
B
Left ventricle
C
Right auricle
D
Left auricle
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Q. 46
The xylem in plants are responsible for:
A
transport of water
B
transport of food
C
transport of amino acids
D
transport of oxygen
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Q. 47
What are the two main types of conduits involved in plant transportation?
A
Roots and stems
B
Xylem and chlorophyll
C
Phloem and stomata
D
Xylem and phloem
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Q. 48
The backflow of blood inside the heart during contraction will b prevented by
A
Thick muscular walls of ventricles
B
Thin walls of atria
C
Valves in heart
D
All of the above
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Q. 49
Which of the following statements are correct?
(i) Pyurvate can be broken down into ethanol and carbon dioxide by yeast.
(ii) Fermentation takes place in aerobic bacteria.
(iii) Fermentation takes place in mitochondria.
(iv) Fermentation is a form of anaerobic respiration.
A
(i) and (iii)
B
(ii) and (iii)
C
(ii) and (iv)
D
(i) and (iv)
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Q. 50
After wound or cut in a body blood coagulates through
A
RBC
B
Platelets
C
Plasma
D
WBC
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Q. 51
Malpighian tubules remove excretory matter from the
A
haemolymph
B
alimentary canal
C
oral cavity
D
all of these
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Q. 52
During respiration exchange of O2 and CO2 takes place in
A
alveoli of lungs
B
larynx and throat
C
trachea and lung
D
pharynx and larynx
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Q. 53
Which of the following components of our food is digested by an enzyme which is present in saliva as well as in pancreatic juice?
A
Proteins
B
Minerals
C
Fats
D
Carbohydrates
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Q. 54
Protein, carbohydrate, and fat components of food are fully digested in the:
A
stomach
B
esophagus
C
small intestine
D
large intestine
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Q. 55
Which nutrient exhibits the lowest percentage of digestion throughout the digestive tract?
A
Fats
B
Carbohydrates
C
Proteins
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Q. 56
Right part of the human heart contains-
A
Mixed blood
B
Oxygenated blood
C
No blood
D
Deoxygenated blood
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Q. 57
Which organisms primarily undergo oxygenic photosynthesis?
A
Plants and animals
B
Algae and certain bacteria
C
Cyanobacteria and fungi
D
Protozoa and archaea
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Q. 58
Choose the correct statement(s).
A
The trachea is not connected to bronchi.
B
From the larynx the air goes to pharynx.
C
Oxygen from alveolar air diffuses into blood and CO2 from blood diffuses into alveolar air.
D
Alveoli increase the surface area for exchange of gases.
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Q. 59
The undigested food is finally removed from the body through
A
anus
B
villi
C
large intestine
D
small intestine
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Q. 60
Saprotrophs are called as decomposers because
A
they accumulate the dead & decay
B
they catabolize the dead & decay
C
they regulate the dead & deccay
D
they anabolize the dead & decay
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Q. 61
The process of an artificial kidney that is used to remove nitrogenous waste products from blood is called
A
Absorption
B
Filtration
C
Excretion
D
Dialysis
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Q. 62
Which of the following is the correct order for the process of nutrition?
A
Digestion, absorption, assimilation, egestion
B
Absorption, assimilation, egestion, ingestion
C
Digestion, absorption, ingestion, egestion
D
Ingestion, digestion, absorption, assimilation
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Q. 63
The amount of energy produce in anaerobic respiration is
A
22 ATP
B
12 ATP
C
222 ATP
D
2 ATP
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Q. 64
Air bladder or swim bladder in fishes is associated with :-
A
sound production
B
hydrostasis
C
gaseous exchange
D
All of the above
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Q. 65
In normal expiration, the diaphragm is
A
Flattened
B
Arched
C
Perforated
D
None of the above
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Q. 66
Human heart is :-
A
Four chambered
B
Three chambered
C
Osmoregulatory organ
D
Excretory organ
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Q. 67
Heart covering is
A
pericardium
B
visceral membrane
C
peritoneum
D
pleural membrane
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Q. 68
Where are proteins first digested in the alimentary canal ?
A
Mouth
B
Oesophagus
C
Stomach
D
Small intestine
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Q. 69
Which of the following is the correct statement regarding bile ?
A
Secreted by liver and stored in bile duct
B
Secreted by gall bladder and stored in liver
C
Secreted by bile duct and stored in liver
D
Secreted by liver and stored in gall bladder
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Q. 70
William Harvey is credited with the discovery of
A
mechanism of respiration
B
blood clotting
C
blood circulation
D
process of digestion
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Q. 71
What does the X-axis of the graph represent?
A
Time
B
Amount of food consumed
C
Sequential structure of the digestive tract
D
Temperature
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Q. 72
The opening of auricle into ventricle on the right side is guarded by :-
A
Eustachius valve
B
Semilunar valves
C
Tricuspid valve
D
Bicuspid valve
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Q. 73
Through which system are nutrients transported to the body's organs?
A
Circulatory system
B
Respiratory system
C
Skeletal system
D
Endocrine system
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Q. 74
Ptyalin is secreted by :-
A
Digestive glands
B
Salivary glands
C
Brunner's glands
D
Gastric galnds
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Q. 75
The final outputs from photosynthesis, to be filled in boxes 4 and 5, are:
A
glucose and oxygen
B
oxygen and glucose
C
glucose and carbon dioxide
D
energy and oxygen
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Q. 76
Outer layer of kidney is
A
pleura
B
none of these
C
medulla
D
cortex
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Q. 77
Food ingested is processed to generate particles, which are small and uniform in texture through:
A
biting
B
mixing with saliva in the mouth
C
licking
D
crushing the food with our teeth
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Q. 78
In which part of alimentary canal food is finally digested ?
A
Small intestine
B
Mouth cavity
C
Large intestine
D
Stomach
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Q. 79
Filteration unit of Nephron is
A
bowman’s capsule
B
glomerulus
C
tubular region
D
kidney
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Q. 80
What is the primary purpose of transportation in plants?
A
Transporting oxygen to the roots
B
Distributing nutrients to the stem
C
Moving water and nutrients from roots to leaves
D
Translocating carbon dioxide from leaves to roots
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Q. 81
The correct path of urine flow in our body is :
A
Kidney → Ureter → Urinary bladder → Urethra
B
Urinary bladder → Kidney → Ureter → Urethra
C
Kidney → Ureter → Urethra → Urinary bladder
D
Kidney Urinary bladder → Urethra → Ureter
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Q. 82
Blood is ejected into the body when:
A
left ventricle expands
B
left atrium relaxes
C
left atrium contracts
D
left ventricle contracts
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Q. 83
Blood that returns to the heart is rich in:
A
oxygen
B
both (a) and (b)
C
carbon monoxide
D
carbon dioxide
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Q. 84
At which point in the digestive tract does the highest percentage of protein digestion occur?
A
Beginning
B
Middle
C
End
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Q. 85
In which organ does the first digestion of starch occur in humans?
A
Mouth
B
Small intestine
C
Stomach
D
Large intestine
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Q. 86
Tachycardia is
A
slow hear rate
B
normal heart rate
C
fast heart rate
D
stop heart rate
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Q. 87
Which of the following enzymes get mixed with food in our mouth?
A
Pepsin
B
Amylase
C
Trypsin
D
Cellulose
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Q. 88
The main function of the ureter is to
A
Take urine from kidneys to urinary bladder
B
Filter blood and remove it to urine
C
Connect the parts of excretory system
D
Control the pressure of urine in urinary bladder
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Q. 89
A student covered a leaf from a destarched plant with a black paper strip and kept it in the garden outside his house in fresh air. In the evening, he tested the covered portion of the leaf for the presence of starch. By doing so the student was trying to show that:
A
Light is necessary for photosynthesis.
B
CO₂ is given out during respiration.
C
CO₂ is necessary for photosynthesis.
D
Chlorophyll is necessary for photosynthesis.
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Q. 90
What is the primary purpose of transportation in plants?
A
Nutrient distribution
B
Water absorption
C
Gas exchange
D
Structural support
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Q. 91
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in :
A
Mitochondria
B
Chloroplast
C
Nucleus
D
Cytoplasm
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Q. 92
The loss of water in the form of vapour from the aerial parts of the plant is known as:
A
respiration
B
transpiration
C
transportation
D
translocation
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Q. 93
Bicuspid valve guards the opening in mammals between
A
right atrium and right ventricle
B
left atrium and left ventricle
C
pulmonary vein and left auricle
D
stomach and intestine
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Q. 94
What is the main constraint in plant transportation?
A
Sunlight availability
B
Soil composition
C
Water availability
D
Temperature fluctuations
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Q. 95
Human being’s nutrition can be categorized as
A
holozoic
B
parasitic
C
symbiotic
D
saprotrophic
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Q. 96
The kidneys in human beings are a part of the system for
A
Excretion
B
Transportation
C
Nutrition
D
Respiration
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Q. 97
In human each kidney has large numbers of filtration units called ___.
A
Neptune
B
Neutrons
C
Nephrons
D
Neurons
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Q. 98
ADH act on
A
collecting duct of testes
B
none of the above
C
loop of Henle
D
collecting tubule of kidney
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Q. 99
The correct pathway of blood in circulatory system is
A
Atria → Ventricles → Arteries → Veins
B
Veins → Ventricles → Atria → Arteries
C
Ventricles → Atria → Veins → Arteries
D
Ventricles → Veins → Arteries → Atria
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Q. 100
In which of the following groups of organisms, food material is broken down outside the body and absorbed ?
A
Mushroom, green plants, amoeba
B
Paramecium, amoeba, cuscuta
C
Yeast, mushroom, bread mould
D
Cuscuta, lice, tapeworm
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Q. 101
Presence of urea in blood is called
A
anuria
B
uraemia
C
haematuria
D
diurea
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Q. 102
The opening and closing of stomatal pores depends upon :
A
Temperature
B
Concentration of carbon dioxide in stomata
C
Water in guard cells
D
Oxygen
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Q. 103
If the pancreatic duct is blocked an hour after one has taken his food, which one of the following will not be affected?
A
Maintenance of normal blood sugar level
B
Carbohydrate digestion
C
Neutralisation of chyme
D
Breakdown of proteins
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Q. 104
Blood from the superior vena cava flows into
A
Left ventricle
B
Right ventricle
C
Left atrium
D
Right atrium
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Q. 105
The matrix of chloroplast is known as :-
A
Stroma
B
Thylakoid
C
Lamellae
D
Grana
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Q. 106
Structure which prevents the entry of food in the wind pipe is :-
A
Glottis
B
Epiglottis
C
Pharynx
D
Gullet
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Q. 107
Painful breathing is called :-
A
Dyspnoea
B
Apnoea
C
Hypopnoea
D
Eupnoea
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Q. 108
Blood Pressure and heart beat is regulated by
A
insulin
B
optic nerve
C
growth hormone
D
adrenaline
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Q. 109
In human digestive system the enzymes pepsin and trypsin are secreted respectively by:
A
Pancreas and liver
B
Stomach and pancreas
C
Stomach and salivary glands
D
Pancreas and gall bladder
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Q. 110
The sphincter muscles that help in regulating the exit of food from stomach into the small intestine is
A
Anal sphincter
B
Cardiac sphincter
C
Pyloric sphincter
D
Ileocecal sphincter
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Q. 111
Bile juice does not contain any enzyme, but bile salts are important for the digestion and absorption of fats. Why?
A
Bile is alkaline and contains salts which help to emulsify or break the fats (or lipids) present in the food.
B
Makes the acidic food coming from the stomach alkaline so that pancreatic enzymes can act on it.
C
Bile salts break the fats present in the food into small globules making it easy for the enzymes to act and digest them.
D
All of the above
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Q. 112
Rajib was absent in the class because of muscle pain which he claims to be due to excess physical exercise he had done yesterday. This pain is due to
A
Formation of Hydrochloric acid
B
Formation of lactic acid
C
Formation of acetic acid
D
Formation of Pyruvic acid
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Q. 113
The autotrophic mode of nutrition requires :
A
chlorophyll
B
sunlight
C
all of the above
D
carbon dioxide and water
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Q. 114
Which is the first enzyme to mix with food in the digestive tract?
A
Pepsin
B
Cellulase
C
Amylase
D
Trypsin
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Q. 115
The mode of nutrition in parasitic organisms is -
A
autotrophic
B
both autotrophic and heterotrophic
C
heterotrophic
D
none of the above
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Q. 116
Villi present on the inner lining of the intestinal wall
A
Increases the surface area for absorption
B
Secretes enzymes for digestion
C
Secretes hormones
D
Decreases the surface area for absorption
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Q. 117
What is the main product of oxygenic photosynthesis?
A
Carbon dioxide
B
Water
C
Sugars
D
Oxygen
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Q. 118
Which of the two, atria or ventricles, possesses thicker muscular walls?
A
Atria
B
Ventricles
C
Septum
D
Both atria and ventricles have similar wall thickness
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Q. 119
Bacteria are
A
saprotrophic
B
all of the these
C
heterotrophic
D
autotrophic
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Q. 120
During deficiency of oxygen in tissues of human beings pyruvic acid is converted into lactic acid in :
A
Mitochondria
B
Cytoplasm
C
Golgi body
D
Chloroplast
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Q. 121
Sulphur bacteria, Nitrogen bacteria are the members opted the nutrition of type
A
chemotrophic
B
symbiotic
C
phototrophic
D
saprophytic
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Q. 122
When air is blown from mouth into a test tube containing lime water, the lime water turns milky due to the presence of:
A
Nitrogen
B
Water vapour
C
Oxygen
D
Carbon dioxide
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Q. 123
Plant transport systems transports:
A
water from leaves
B
raw materials to roots
C
synthesized glucose to leaves
D
raw materials from roots
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Q. 124
The force that blood exerts against the wall of a vessel is called
A
Diastolic pressure
B
Systolic pressure
C
None of these
D
Blood pressure
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Q. 125
In Photosynthetic process, atmospheric carbon di oxide is _______ to carbohydrates .
A
Burnt
B
Neutralised
C
oxidised
D
Reduced
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Q. 126
What do plants absorb through their roots, completing the picture in box 2?
A
water
B
mineral nutrients
C
air
D
chemicals
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Q. 127
What are the two types of photosynthetic processes?
A
Oxygenic and aerobic
B
Anaerobic and aerobic
C
Oxygenic and anoxygenic
D
Aerobic and anaerobic
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Q. 128
Which statement below is false?
A
Valves ensure one-way blood flow during atria or ventricle contractions.
B
Vertebrates utilize double circulation.
C
Deoxygenated blood travels from the body to the upper right chamber.
D
Amphibians or many reptiles have three-chambered hearts, but they do not tolerate the mixing of oxygenated and deoxygenated bloodstreams.
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Q. 129
What is the function of xylem in plant transportation?
A
Transporting water and minerals from roots to leaves
B
Transporting sugars from leaves to roots
C
Transporting gases between leaves and roots
D
Providing structural support to the plant
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Q. 130
Which process converts sunlight, carbon dioxide, and water into sugars and oxygen?
A
Respiration
B
Photosynthesis
C
Fermentation
D
Digestion
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Q. 131
The power-house of cell is
A
nucleus
B
lysosome
C
mitochondria
D
cytoplasm
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Q. 132
The enzyme Pepsin is inactive in stomach without the presence of
A
Acetic acid
B
Nitric Acid
C
Butyric acid
D
Hydrochloric acid
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Q. 133
An appropriate entry for box 3 shown in the figure is:
A
oxygen
B
air
C
nitrogen
D
carbon dioxide
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Q. 134
The pancreatic juice does not contain one of the following enzymes.
A
Lipase
B
Trypsin
C
Ptyalin
D
Amylase
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Q. 135
How do xylem and phloem tissues resemble the circulatory system in humans?
A
They originate from leaves and move down to the roots
B
They are involved in the distribution of gases.
C
They extend throughout the plant similar to blood vessels in hum
D
They are only present in certain parts of the plant.
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Q. 136
Bile from the liver is received in which part ofthe alimentary canal?
A
Large intestine
B
Small intestine
C
Stomach
D
Oesophagus
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Q. 137
What is the name of the pigment that should be filled in the box 1?
A
chloroplast
B
chromophyll
C
chlorophyll
D
chromoplast
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Q. 138
The kidneys in human beings are a part of the system for:
A
Transportation
B
Excretion
C
Respiration
D
Nutrition
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Q. 139
When water enters the guard cells the stomata
A
No effect
B
Opens
C
Closes
D
Open or closes
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Q. 140
What is the size of a normal human heart approximately?
A
Size of a walnut
B
Size of a tennis ball
C
Size of a person's fist
D
Size of a golf ball
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Q. 141
In humans, chemical digestion is accomplished by enzyme action that begins in the mouth and ends in the:
A
Oesophagus
B
Stomach
C
Small Intestine
D
Gall bladder
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Q. 142
During hibernation, frog respires by :-
A
Partly skin and partly lungs
B
Only buccopharyngeal cavity
C
Only skin
D
Only lungs
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Q. 143
What are the upper chambers of the heart called?
A
Atria
B
Ventricles
C
Septum
D
Valves
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Q. 144
In the experiment to show that 'CO₂, is released during respiration', the solution in the test tube is chemically:
A
KOH
B
KCI
C
NaOH
D
NaCl
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Q. 145
Excretory product of spider is
A
uric acid
B
guanine
C
ammonia
D
none of these
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Q. 146
Which type of photosynthesis is most commonly observed in plants, algae, and cyanobacteria?
A
Anaerobic photosynthesis
B
Aerobic photosynthesis
C
Oxygenic photosynthesis
D
Anoxygenic photosynthesis
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