Students of class 10 Science should refer to MCQ Questions Class 10 Science Life Processes with answers provided here which is an important chapter in Class 10 Science NCERT textbook. These MCQ for Class 10 Science with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 10 Science. The following MCQs can help you to practice and get better marks in the upcoming class 10 Science examination

Chapter 6 Life Processes MCQ with Answers Class 10 Science

MCQ Questions Class 10 Science Life Processes provided below have been prepared by expert teachers of grade 10. These objective questions with solutions are expected to come in the upcoming Standard 10 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. In which of the following groups of organisms, food materials are broken down outside the body and absorbed?   
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm

Question. The characteristic processes observed in anaerobic respiration are   
i) presence of oxygen
ii) release of carbon dioxide
iii) release of energy
iv) release of lactic acid
(a) i), ii) only
(b) i), ii), iii) only
(c) ii), iii), iv) only
(d) iv) only

Question. The contraction and expansion movement of the walls of the food pipe is called:   
(a) translocation
(b) transpiration
(c) peristaltic movement
(d) digestion

Question. Which is the correct sequence of body parts in the human alimentary canal?   
(a) Mouth → stomach → small intestine → large intestine → oesophagus
(b) Mouth → oesophagus → stomach → small intestine → large intestine
(c) Mouth → stomach → oesophagus → small intestine → large intestine
(d) Mouth → oesophagus → stomach → large intestine → small intestine

Question. What are the products obtained by anaerobic respiration in plants?   
(a) Lactic acid + Energy
(b) Carbon dioxide + Water + Energy
(c) Ethanol + Carbon dioxide + Energy
(d) Pyruvate

Question. When a few drops of iodine solution are added to rice water, the solution turns blue- black in colour. This indicates that rice water contains:   
(a) fats
(b) complex proteins
(c) starch
(d) simple proteins

Question. What is the percentage of the oxygen in the expired air when a person is resting:   
(a) 12%
(b) 16%
(c) 20%
(d) 24%

Question. The respiratory pigment in human beings is:   
(a) carotene
(b) chlorophyll
(c) haemoglobin
(d) mitochondria

Question. The opening and closing of the stomatal pore depends upon   
(a) Oxygen
(b) temperature
(c) water in the guard cells
(d) concentration of CO₂

Question. In amoeba, food is digested in the:   
(a) food vacuole
(b) mitochondria
(c) pseudopodia
(d) chloroplast

Question. A plant gets rid of excess water through transpiration. Which is a method used by plants to get rid of solid waste products?   
(a) shortening of stem
(b) dropping down of fruits
(c) shedding of yellow leaves
(d) expansion of roots into the soil

Question. Which of the following is the important characteristic of Emphysema:   
(a) Destruction of the alveolar wall and air sacs in the lungs are damaged.
(b) Increase in the growth of the lung tissue.
(c) Inflammation in the wall of bronchi.
(d) Thickening of the artery walls of the lungs.

Question. Digestion of food starts from which organ of the human digestive system?   
(a) mouth due to the presence of saliva
(b) oesophagus that moves the food in gut
(c) that releases juices for fat breakdown
(d) which helps in mixing food with digestive juices

Question. Chemicals present in the tobacco smoke lead to the breakdown of the elastic tissue in the alveoli.   
Name this specific condition.
(a) Heart disease
(b) Emphysema
(c) Bronchitis
(d) Lung cancer

Question. How is food transported from phloem to the tissues according to plants’ needs? 
(a) food is transported along with the water in the plant’s body.
(b) food is transported in only direction like water in the plant body through xylem.
(c) food is transported from a region with low concentration to higher concentration.
(d) Food is transported from a region where it is produced to other parts of the plants. 

Question.The kidneys in human beings are parts of the system for     
(a) nutrition
(b) respiration
(c) excretion
(d) transpiration

Question. Assertion: When air is passed through lime water, lime water turns milky.       
Reason: Air contains 78% nitrogen and 21% oxygen.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Question. Glycolysis process occurs in which part of the cell?     
(a) Cytoplasm
(b) Nucleus
(c) Mitochondria
(d) Chloroplast

Question. When air is blown from mouth into a test – tube containing lime water, the lime water turned milky due to presence of:   
(a) oxygen
(b) nitrogen
(c) water vapour
(d) carbon dioxide

Question. A biochemical compound that readily combines with oxygen and distributes it throughout the human body is     
(a) water
(b) urea
(c) haemoglobin
(d) acetylcholine

Question. The mode of nutrition found in fungi is:   
(a) Parasitic nutrition
(b) Holozoic nutrition
(c) Autotrophic nutrition
(d) Saprotrophic nutrition

Question. Large intestine in man mainly carries out     
(a) absorption
(b) assimilation
(c) digestion of fats
(d) digestion of carbohydrates

Question. Where is the dirty blood in our body filtered?   
(a) Heart
(b) Lungs
(c) Ureter
(d) Kidneys

Question. A large quantity of one of the following is removed from our body by lungs:     
(a) CO ₂ and H ₂ O
(b) CO ₂ only
(c) FLO only
(d) ammonia 

Question. Blood pressure is measured by an instrument called     
(a) barometer
(b) sphygmomanometer
(c) photometer
(d) manometer

Question. Woody plants carry gaseous exchange through   
(a) root hair
(b) stem hair
(c) Lenticels
(d) epidermal cells

Question. Which of the following statements is not correct?   
(a) Deoxygenated blood is poured into right atrium of heart.
(b) The excretory units of flatworms are flame cells.
(c) Human kidney has about 1 million nephridia
(d) Tracheids and vessels are non-living conducting tissues.

Question. The contraction and expansion movement of the walls of the food pipe is called:   
(a) translocation
(b) transpiration
(c) peristaltic movement
(d) digestion

Question. Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva?   
(a) Starch breaking down into sugars.
(b) Proteins breaking down into amino acids.
(c) Absorption of vitamins.
(d) Fats breaking down into fatty acids and glycerol.

Question. The respiratory pigment in human beings is: 
(a) carotene
(b) chlorophyll
(c) haemoglobin
(d) mitochondria

Question. Which of the following statements about the autotrophs is incorrect?
(a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll
(b) They store carbohydrates in the form of starch
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight
(d) They constitute the first trophic level in food chains

Question. Chief function of HCI is
(a) to maintain a low pH to prevent growth of micro-organisms
(b) to maintain facilitation absorption
(c) to maintain low pH to activate pepsinogen to form pepsin
(d) to dissolve enzyme secreted in stomach

Question. Dyspnoea is the :-
(a) Normal breathing
(b) Difficult breathing
(c) Rapid breathing
(d) Stage without breathing

Question. CO₂ is transported as
(a) dissolved in blood plasma
(b) as carbonic acid
(c) in carbaminohaemoglobin
(d) as carbaminohaemoglobin and carbonic acid

Question. Presence of a large number of mitochondria in the tubule cells of nephrons suggests that the nephron is involved in the process of :-
(a) passive transport
(b) active transport
(c) formation of urea
(d) diffusion

Question. Carbonic anhydrase is present in high concentration in
(a) plasma
(b) erythrocytes
(c) leucocytes
(d) neurones

Question. Which one of the following is connected with transport of water in plants ?
(a) Phloem
(b) Xylem
(c) Epidermis
(d) Cambium

Question. Through mastication of food is essential because
(a) mastication of food makes the teeth stronger
(b) it makes the process of swallowing the food easier
(c) by this process bigger pieces of food are broken down into smaller pieces.
(d) bigger pieces of food are broken down into smaller pieces and saliva is properly mixed with it

Question. The wave of contractions that pushes the food through the alimentary canal is called
(a) peritoneum
(b) peristalsis
(c) cyclosis
(d) polarisation

Question. In amoeba absorption of the digested nutrients occurs in
(a) contractile vacuole
(b) plasma membrane
(c) cytoplasm
(d) pseudopodia

Question. In amoeba the digestion of food is
(a) extracellular
(b) intracellular
(c) intercellular
(d) none of the above

Question. Coiled and well developed alimentary canal first developed in
(a) Protozoans
(b) Mammals
(c) Arthropods
(d) Poriferans

Question. Digestion of starch starts from
(a) stomach
(b) intestine
(c) esophagus
(d) mouth

Question. Which of the following sections does not contain enzymes ?
(a) Bile
(b) Pancreatic juice
(c) Intestinal juice
(d) Saliva

Question. Chewing is an example of
(a) chemical digestion
(b) mechanical digestion
(c) involuntary action
(d) hydrolysis

Question. Osmosis is the movement of :
(a) solute particles from higher concentration to lower concentration
(b) solvent particles from higher water potential to lower water potential through a semi permeable membrane
(c) solute particles from higher concentration to lower concentration through a semipermeable membrane
(d) solvent particles from lower water potential to higher water potential.

Question. Exchange of respiratory gases takes place in an earthworm through
(a) moist skin
(b) gills
(c) trachea
(d) lungs

Question. Which of the following contributes most to transport of water from the ground to the leaves of a tall tree ?
(a) Breakdown of ATP
(b) Capillary rise of water is xylem
(c) Cohesion of water and transpiration pull
(d) Root pressure.

Question. The process of transpiration in plants helps in
(a) opening of stomata
(b) absorption of CO₂ from atmosphere
(c) upward conduction of water and minerals
(d) absorption of O₂ from atmosphere

Question. Opening and closing of stomata is due to
(a) pressure of gases inside the leaves
(b) changes of turgor pressure in guard cells
(c) effect of hormones
(d) their genetic constitution

Question. The carbohydrates synthesized in the leaves are transported through sieve tubes most commonly in the form of
(a) glucose
(b) starch
(c) sucrose
(d) cellulose

Question. In a closed circulatory system, blood is completely enclosed with in
(a) sinuses
(b) vessels
(c) heart
(d) skeleton

Question. An artery is a vessel that carries blood
(a) with high concentration of oxygen
(b) with high concentration of CO₂
(c) away from the heart
(d) both A & C

Question. Ptyalin enzyme is secreted by
(a) salivary glands
(b) mouth
(c) esophagus
(d) stomach

Question. The path taken by food material after ingestion is represented by
(a) Mouth Pharynx Oesophagus Stomach
(b) Mouth Pharynx Oesophagus Small Intestine
(c) Mouth Oesophagus Stomach Pharynx
(d) Oesophagus Mouth Pharynx Stomach

Question. Teeth involved in cutting of food material are called
(a) canines
(b) incisors
(c) molars
(d) premolars

Question. About 30% of CO₂ is transported as
(a) carbamino compounds
(b) bicarbonates of Na and K
(c) carboxyhaemoglobin
(d) oxyhaemoglobin

Question. Match the names of the parts listed under column–I with the names of the organs listed under column–II. Choose the answer which gives the correct combination of the alphabets :-

(a) a = r, b = t, c = s, d = p
(b) a = r, b = s, c = t, d = p
(c) a = s, b = q, c = p, d = t
(d) a = s, b = r, c = p, d = t

Question. Match the different leucocytes given under Column I with their functions given under Column II. Choose the answer that gives the correct combination of alphabets of two columns :-

(a) A = t, B = p, C = q, D = f
(b) A = r, B = p, C = q, D = t
(c) A = q, B = r, C = s, D = t
(d) A = p, B = q, C = r, D = s

Question. In which of the following groups of organisms, food material is broken down outside the body and absorbed? 
(a) Mushroom, green plants, Amoeba
(b) Yeast, mushroom, bread mould
(c) Paramecium, Amoeba, Cuscuta
(d) Cuscuta, lice, tapeworm

Question. Select the correct statement
(a) Heterotrophs do not synthesise their own food
(b) Heterotrophs utilise solar energy for photosynthesis
(c) Heterotrophs synthesise their own food
(d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

Question. Which part of alimentary canal receives bile from the liver?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Oesophagus

Question. Choose the function of the pancreatic juice from the following
(a) trypsin digests proteins and lipase carbohydrates
(b) trypsin digests emulsified fats and lipase proteins
(c) trypsin and lipase digest fats
(d) trypsin digests proteins and lipase emulsified fats

Question. Which of the following statement(s) is (are) true about respiration?
(i) During inhalation, ribs move inward and diaphragm is raised
(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air
(iii) Haemoglobin has greater affinity for carbon dioxide than oxygen
(iv) Alveoli increase surface area for exchange of gases
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (iii)
(d) (ii) and (iv)

Question. Which is the correct sequence of air passage during inhalation?
(a) Nostrils → larynx → pharynx → trachea → lungs
(b) Nasal passage → trachea → pharynx → larynx → alveoli
(c) larynx → nostrils → pharynx → lungs
(d) Nostrils → pharynx → larynx → trachea → alveoli

Question. Which of the following statement (s) is (are) true about heart?
(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs
(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs
(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts
(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body
(a) (i)
(b) (ii)
(c) (ii) and (iv)
(d) (i) and (iii)

Question. What prevents backflow of blood inside the heart during contraction?
(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above

Question. Which of the following is an incorrect statement?
(a) Organisms grow with time
(b) Organisms must repair and maintain their structure
(c) Movement of molecules does not take place among cells
(d) Energy is essential for life processes

Question. Which of the following equations is the summary of photosynthesis?
(a) 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂+ 6H₂O
(b) 6CO₂ + H₂O + Sunlight → C₆H₁₂O6 + O₂+ 6H₂O
(c) 6CO₂ + 12H₂O + Chlorophyll + Sunlight → C6H₁₂O₆ + 6O₂+ 6H₂O
(d) 6CO₂ + 12H₂O + Chlorophyll + Sunlight → C₆H₁₂O₆ + 6CO₂+ 6H₂O

Question. Choose the event that does not occur in photosynthesis
(a) Absorption of light energy by chlorophyll
(b) Reduction of carbon dioxide to carbohydrates
(c) Oxidation of carbon to carbon dioxide
(d) Conversion of light energy to chemical energy

Question. Life process that converts chemical energy into heat energy
(a) Nutrition
(b) Respiration
(c) Digestion
(d) Excretion

Question. Energy rich foods are
(a) Carbohydrates and fats
(b) Proteins and mineral salts
(c) Vitamins and minerals
(d) Water and roughage

Question. Pick out the incorrect statement
(a) Organisms grow with time
(b) Organisms must repair and maintain their structure
(c) Movement of molecules does not take place among cells
(d) Energy is essential for life processes

Question. Loss of water from leaves will be less if stomata are
(a) Only on lower surface
(b) Only on upper surface
(c) On both the surfaces
(d) Scattered

Question. Guard cells differ from epidermal cells in having
(a) Vacuoles
(b) Nucleus
(c) Mitochondria
(d) Chloroplasts

Question. Transpiration occurs from
(a) Stomata
(b) Cuticle
(c) Both of these
(d) None of these

Question. The process in which loss of water takes place in the form of water vapour through stomata is called
(a) Transportation
(b) Transpiration
(c) Guttation
(d) Translocation

Question. The plant part that do not involve in exchange of gas is
(a) Leaf
(b) Flower
(c) Root
(d) Stem

Question. Among the following group of plants, select the plant where you find stomata open at night and close by day time
(a) Epiphytes
(b) Succulents
(c) Mangroves
(d) Hydrophytes

Question. The process of taking food in the body is called as
(a) Ingestion
(b) Assimilation
(c) Absorption
(d) Digestion 

Question. Among the following, which is not considered as part of small intestine
(a) Duodenum
(b) Jejunum
(c) Ileum
(d) Rectum

Question. The force of water absorption affected by opening and closing of stomata is
(a) Root pressure
(b) Transpiration pull
(c) Both of these
(d) None of these

Question. The transport of water to upper parts of the plants during night is due to
(a) Root pressure
(b) Transpiration
(c) Translocation
(d) Leaf pressure

Question. The stain that is generally used in preparing a temporary mount of a leaf put to show stomata is
(a) Safranin
(b) Hematoxylin
(c) Acetocarmine
(d) Eosin

Question. The first enzyme to mix with food in the digestive tract is
(a) Pepsin
(b) Cellulase
(c) Amylase
(d) Trypsin

Question. The part of the alimentary canal where food is finally digested
(a) Stomach
(b) Mouth cavity
(c) Large intestine
(d) Small intestine

Question. The principal transpiring organ of a plant is
(a) Root
(b) Stem
(c) Flower
(d) Leaf

Question. Transpiration helps in
(a) Temperature regulation
(b) Maintaining upward movement of water
(c) Wilting of leaves
(d) Both a and b

Question. The mounting material used in the preparation of a leaf peel is
(a) Water
(b) Glycerine
(c) Wax
(d) None of these

Question. The type of leaf to be selected while preparing a temporary mount of a leaf peel to show stomata is
(a) Turgid
(b) Flaccid
(c) Turbid
(d) Flattened

Question. Opening of stomata is influenced more by
(a) Red light
(b) Green light
(c) Indigo light
(d) Blue light

Question. Plant groups in which sunken stomata are generally found are
(a) Mesophytes
(b) Epiphytes
(c) Xerophytes
(d) Hydrophytes

Question. Xerophytes have drought tolerance as compared to mesophytes because of
(a) Thick cuticle
(b) Sunken stomata
(c) Very less transpiration
(d) All of these

Question. Given below are the steps to be followed for performing starch test on a green leaf
(i) Boil the leaf in alcohol
(ii) Boil the leaf in water
(iii) Dip the leaf in iodine solution
(iv) Wash the leaf in water
The correct sequences of steps are
(a) (i), (iv), (ii), (iii
(b) (ii), (iv), (i), (iii)
(c) (ii), (i), (iv), (iii)
(d) (iv), (i), (ii), (iii)

Question. The part of leaf commonly used for preparing the slide of stomata is
(a) Leaf margin
(b) Leaf apex
(c) Leaf epidermis
(d) Leaf petiole

Question. Woody plants carry gaseous exchange through
(a) Root hair
(b) Stem hair
(c) Lenticels
(d) Epidermal cells

Question. Roots of the plants absorb water from the soil through the process of
(a) Diffusion
(b) Transpiration
(c) Osmosis
(d) None of these

Question. A student wanted to decolourise a leaf. He should boil the leaf in
(a) Alcohol
(b) Water
(c) KOH solution
(d) Glycerine

We hope the above multiple choice questions for Class 10 Science for Chapter 6 Life Processes provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Life Processes is an important chapter in Class 10 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 10 students. Please go through these and let us know if you have any feedback in the comments section.