Life Processes class 10 Important MCQ
Life Processes class 10 Important MCQ
- Which process is essential for
maintaining life?
A) Respiration
B) Nutrition
C) Transportation
D) All of these
Ans: D - The process by which organisms
take in food is called
A) Digestion
B) Nutrition
C) Respiration
D) Excretion
Ans: B - Which is an autotrophic mode of
nutrition?
A) Holozoic
B) Parasitic
C) Saprophytic
D) Photosynthesis
Ans: D - Photosynthesis occurs in
A) Mitochondria
B) Ribosomes
C) Chloroplast
D) Nucleus
Ans: C - The raw materials for
photosynthesis are
A) Oxygen & water
B) Carbon dioxide & water
C) Oxygen & glucose
D) Nitrogen & water
Ans: B - The green colour of leaves is due
to
A) Chlorophyll
B) Carotene
C) Xanthophyll
D) Melanin
Ans: A - Which gas is released during
photosynthesis?
A) CO₂
B) Nitrogen
C) Oxygen
D) Hydrogen
Ans: C - Which organism shows holozoic
nutrition?
A) Fungi
B) Amoeba
C) Cuscuta
D) Mushroom
Ans: B - Which enzyme is present in saliva?
A) Pepsin
B) Trypsin
C) Amylase
D) Lipase
Ans: C - The process of breaking down food
into simpler substances is called
A) Nutrition
B) Respiration
C) Digestion
D) Assimilation
Ans: C - Which acid is present in stomach?
A) Sulphuric acid
B) Nitric acid
C) Hydrochloric acid
D) Acetic acid
Ans: C - Bile is produced by
A) Pancreas
B) Liver
C) Stomach
D) Intestine
Ans: B - Bile helps in
A) Digestion of proteins
B) Digestion of carbohydrates
C) Emulsification of fats
D) Digestion of vitamins
Ans: C - Which part of alimentary canal
absorbs digested food?
A) Stomach
B) Large intestine
C) Small intestine
D) Oesophagus
Ans: C - The finger-like projections in
small intestine are called
A) Alveoli
B) Nephrons
C) Villi
D) Cilia
Ans: C - The process of taking oxygen into
cells is called
A) Breathing
B) Respiration
C) Inhalation
D) Exhalation
Ans: B - Respiration is a
A) Physical process
B) Chemical process
C) Biological process
D) All of these
Ans: D - Which type of respiration occurs
in yeast?
A) Aerobic
B) Anaerobic
C) Cellular
D) External
Ans: B - The energy currency of cell is
A) ADP
B) ATP
C) AMP
D) NAD
Ans: B - In aerobic respiration, end
products are
A) CO₂ and alcohol
B) CO₂ and water
C) Lactic acid
D) Alcohol only
Ans: B
- Anaerobic respiration in muscles
produces
A) Alcohol
B) CO₂
C) Lactic acid
D) Glucose
Ans: C - The main respiratory organ in
humans is
A) Trachea
B) Lungs
C) Bronchi
D) Alveoli
Ans: B - Exchange of gases occurs in
A) Bronchi
B) Trachea
C) Alveoli
D) Larynx
Ans: C - Alveoli provide
A) Strength
B) Surface area
C) Protection
D) Moisture
Ans: B - Which pigment carries oxygen in
blood?
A) Plasma
B) WBC
C) Haemoglobin
D) Platelets
Ans: C - Human heart has
A) Two chambers
B) Three chambers
C) Four chambers
D) Five chambers
Ans: C - Which blood vessel carries
oxygenated blood from lungs to heart?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Vena cava
Ans: B - Blood vessels that carry blood
away from heart are
A) Veins
B) Capillaries
C) Arteries
D) Venules
Ans: C - Which component of blood helps in
clotting?
A) RBC
B) WBC
C) Plasma
D) Platelets
Ans: D - Double circulation means
A) Blood passes twice through lungs
B) Blood passes twice through heart
C) Blood passes once through heart
D) Blood passes twice through body
Ans: B - Transportation in plants occurs
through
A) Xylem and phloem
B) Trachea and bronchi
C) Artery and vein
D) Nephrons
Ans: A - Xylem transports
A) Food
B) Water
C) Oxygen
D) Hormones
Ans: B - Phloem transports
A) Water
B) Minerals
C) Food
D) Oxygen
Ans: C - Transpiration occurs mainly
through
A) Roots
B) Stem
C) Leaves
D) Flowers
Ans: C - Loss of water from leaves is
called
A) Respiration
B) Transpiration
C) Excretion
D) Evaporation
Ans: B - Which increases rate of
transpiration?
A) High humidity
B) Low temperature
C) High wind speed
D) Darkness
Ans: C - The excretory unit of kidney is
A) Neuron
B) Nephron
C) Alveolus
D) Villus
Ans: B - Kidneys help in
A) Respiration
B) Digestion
C) Excretion
D) Circulation
Ans: C - The functional unit of kidney is
A) Neuron
B) Nephron
C) Kidney
D) Ureter
Ans: B - Urine is stored in
A) Kidney
B) Ureter
C) Urinary bladder
D) Urethra
Ans: C
- Which substance is removed by
kidneys?
A) Oxygen
B) Glucose
C) Urea
D) Vitamins
Ans: C - Dialysis is used when
A) Heart fails
B) Kidney fails
C) Liver fails
D) Lung fails
Ans: B - Excretion in plants occurs through
A) Stomata
B) Roots
C) Leaves
D) All of these
Ans: D - The process of removing wastes
from body is called
A) Nutrition
B) Respiration
C) Excretion
D) Circulation
Ans: C - Which hormone regulates blood
sugar?
A) Thyroxine
B) Insulin
C) Adrenaline
D) Growth hormone
Ans: B - Which life process provides
energy?
A) Nutrition
B) Respiration
C) Transportation
D) Excretion
Ans: B - The opening of trachea is guarded
by
A) Epiglottis
B) Glottis
C) Larynx
D) Pharynx
Ans: A - Stomata help in
A) Respiration
B) Transpiration
C) Exchange of gases
D) All of these
Ans: D - Blood is a
A) Tissue
B) Organ
C) System
D) Cell
Ans: A - Plasma contains
A) Cells only
B) Proteins, nutrients
C) Oxygen only
D) Hormones only
Ans: B - Which chamber pumps blood to
lungs?
A) Right atrium
B) Right ventricle
C) Left atrium
D) Left ventricle
Ans: B - Which chamber pumps blood to body?
A) Right atrium
B) Right ventricle
C) Left atrium
D) Left ventricle
Ans: D - Large intestine absorbs
A) Food
B) Oxygen
C) Water
D) Enzymes
Ans: C - Pancreas produces
A) Insulin
B) Glucagon
C) Digestive enzymes
D) All of these
Ans: D - Which is not a life process?
A) Growth
B) Reproduction
C) Respiration
D) Excretion
Ans: B - The movement of food in oesophagus
occurs by
A) Diffusion
B) Transpiration
C) Peristalsis
D) Osmosis
Ans: C - Which organ filters blood?
A) Heart
B) Liver
C) Kidney
D) Lung
Ans: C - RBC lifespan is about
A) 60 days
B) 90 days
C) 120 days
D) 200 days
Ans: C - Which process releases energy?
A) Photosynthesis
B) Respiration
C) Transpiration
D) Digestion
Ans: B - The end product of anaerobic respiration
in plants is
A) Lactic acid
B) Alcohol
C) CO₂ and water
D) Glucose
Ans: B
- The process of intake of oxygen is
called
A) Exhalation
B) Respiration
C) Inhalation
D) Diffusion
Ans: C - Which structure prevents food from
entering trachea?
A) Larynx
B) Epiglottis
C) Bronchi
D) Pharynx
Ans: B - Oxygen is transported in blood by
A) Plasma
B) Platelets
C) Haemoglobin
D) WBC
Ans: C - The waste nitrogenous product in
humans is
A) Ammonia
B) Urea
C) Uric acid
D) Nitrate
Ans: B - Which plant tissue carries food?
A) Xylem
B) Cambium
C) Phloem
D) Cortex
Ans: C - Root pressure helps in
A) Transpiration
B) Photosynthesis
C) Absorption
D) Transport of water
Ans: D - Which organ is part of both respiratory
and digestive system?
A) Trachea
B) Larynx
C) Pharynx
D) Oesophagus
Ans: C - Which blood cells fight infection?
A) RBC
B) Platelets
C) Plasma
D) WBC
Ans: D - Transpiration pull occurs due to
A) Root pressure
B) Capillarity
C) Evaporation
D) Osmosis
Ans: C - Which structure increases surface
area for absorption?
A) Alveoli
B) Nephrons
C) Villi
D) Capillaries
Ans: C - Lungs are protected by
A) Skull
B) Rib cage
C) Pelvic girdle
D) Backbone
Ans: B - Which process removes excess water
from plants?
A) Respiration
B) Transpiration
C) Photosynthesis
D) Germination
Ans: B - Human excretory system includes
A) Kidneys
B) Ureters
C) Urinary bladder
D) All of these
Ans: D - Which life process involves
enzymes?
A) Respiration
B) Digestion
C) Transportation
D) Excretion
Ans: B - The movement of food in amoeba is
by
A) Pseudopodia
B) Flagella
C) Cilia
D) Tentacles
Ans: A - Which organ produces digestive
juice?
A) Liver
B) Pancreas
C) Stomach
D) All of these
Ans: D - Which is not a component of blood?
A) RBC
B) WBC
C) Platelets
D) Lymph
Ans: D - Which waste is removed through
lungs?
A) Urea
B) Water
C) CO₂
D) Ammonia
Ans: C - Which structure connects kidney to
bladder?
A) Urethra
B) Nephron
C) Ureter
D) Vena cava
Ans: C - Which life process occurs at
cellular level?
A) Respiration
B) Nutrition
C) Transportation
D) Excretion
Ans: A
- Which structure prevents backflow
of blood in heart?
A) Valves
B) Septum
C) Vessels
D) Arteries
Ans: A - The rate of breathing increases
during
A) Rest
B) Sleep
C) Exercise
D) Sitting
Ans: C - Photosynthesis occurs mainly in
A) Stem
B) Root
C) Leaf
D) Flower
Ans: C - Which is a parasitic plant?
A) Mango
B) Neem
C) Cuscuta
D) Grass
Ans: C - Blood without oxygen is called
A) Pure blood
B) Oxygenated blood
C) Deoxygenated blood
D) Plasma
Ans: C - Which organ secretes bile?
A) Gall bladder
B) Liver
C) Pancreas
D) Stomach
Ans: B - Which process helps in cooling of
plants?
A) Respiration
B) Photosynthesis
C) Transpiration
D) Germination
Ans: C - Which organ helps in
detoxification?
A) Kidney
B) Liver
C) Heart
D) Lung
Ans: B - The transport of oxygen in plants
occurs by
A) Xylem
B) Phloem
C) Diffusion
D) Transpiration
Ans: C - Which blood vessel has valves?
A) Artery
B) Vein
C) Capillary
D) Aorta
Ans: B - The opening of stomach to
intestine is controlled by
A) Cardiac sphincter
B) Pyloric sphincter
C) Epiglottis
D) Valve
Ans: B - Which organ stores urine
temporarily?
A) Kidney
B) Ureter
C) Urinary bladder
D) Urethra
Ans: C - Which tissue transports food in
plants?
A) Xylem
B) Phloem
C) Cambium
D) Cortex
Ans: B - Life processes are essential
because they
A) Maintain life
B) Remove waste
C) Provide energy
D) All of these
Ans: D - Which structure allows exchange of
gases in plants?
A) Lenticels
B) Stomata
C) Roots
D) All of these
Ans: D - Which is not a digestive enzyme?
A) Pepsin
B) Trypsin
C) Insulin
D) Amylase
Ans: C - Which life process includes intake
of food?
A) Respiration
B) Nutrition
C) Excretion
D) Circulation
Ans: B - Oxygen is required for
A) Aerobic respiration
B) Anaerobic respiration
C) Photosynthesis only
D) Fermentation
Ans: A - The main function of large
intestine is
A) Digestion
B) Absorption of food
C) Absorption of water
D) Secretion
Ans: C - Life processes help in
A) Growth
B) Repair
C) Maintenance
D) All of these
Ans: D
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