Please refer to Chapter 6 Life Processes MCQ Class 10 Science with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 10 Science. Students should refer to MCQ Questions for Class 10 Science with Answers to score more marks in Grade 10 Science exams. Students should read the chapter Life Processes and then attempt the following objective questions.

MCQ Questions Class 10 Science Chapter 6 Life Processes

The Life Processes MCQ Class 10 Science provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. Amoeba shows following kind of nutrition.
(a) autotrophic
(b) holozoic
(c) saprotrophic
(d) parasitic

Question. In which of the following group/ groups of animals, heart does not pump oxygenated blood to different parts of the body?
(a) Pisces only
(b) Amphibians only
(c) Amphibians and reptiles only
(d) Pisces and amphibians

Question. The site of photosynthesis in the cells of a leaf is
(a) chloroplast
(b) mitochondria
(c) cytoplasm
(d) protoplasm

Question. Assertion: Veins have thin walls to collect blood from different organs.
Reason: Blood in veins are not under pressure.
(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. Which plant tissue transports water and minerals from the roots to the leaf?
(a) Xylem
(b) Phloem
(c) Parenchyma
(d) Collenchyma

Question. The filtration units of kidneys are called
(a) Ureter
(b) Urethra
(c) Neurons
(d) nephrons.

Question. A gland not associated with the alimentary canal is
(a) liver
(b) salivary glands
(c) pancreas
(d) adrenal

Question. Name the substances whose build up in the muscles during vigorous physical exercise may cause cramps?
(a) Ethanol + Carbon dioxide + Energy
(b) Lactic acid + Energy
(c) Carbon dioxide + Water + Energy
(d) Pyruvate

Question. The exit of unabsorbed food material is regulated by
(a) liver
(b) anus
(c) small intestine
(d) anal sphincter

Question.The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus

Question. During contraction of heart, what prevents back flow of blood?
(a) Thin walls of atria
(b) Thick muscular walls of ventricles
(c) Valves in the heart
(d) All of the above

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

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. The xylem in plants are responsible for
(a) transport of water
(b) transport of food
(c) transport of amino acids
(d) transport of oxygen

Question. The process by which blood is cleared of metabolic wastes in case of kidney failure is called
(a) artificial kidney
(b) dialysis
(c) transplantation
(d) filtration

Question. Villi are present on
(a) stomach
(b) large intestine
(c) small intestine
(d) mouth

Question. Values are found in veins to check the backflow of blood flowing under
(a) low pressure
(b) high pressure
(c) no pressure
(d) atmospheric pressure.

Question. The phenomena non of uptake of water at the expense of energy by the cells and usually against the osmotic gradient is known as
(a) active absorption
(b) passive absorption
(c) osmosis
(d) diffusion

Question. Water will be absorbed by root hair when
(a) concentration of solutes in the cells sap in high
(b) plant in rapidly respiring
(c) they are separated from soil by a permeable membrane
(d) concentration of salts in the soil in high.

Question. Root cap has no role in water absorption because
(a) it has no direct connection with the vascular system
(b) it has no cells containing chloroplasts
(c) it has no root hairs
(d) it has loosely arranged cells.

Question. A mature human erythrocyte has the typical characteristic of
(a) a eukaryotic cell
(b) a prokaryotic cell
(c) both eukaryotic and prokaryotic cell
(d) neither eukaryotic nor prokaryotic cell

Question. Removal of calcium from freshly collected blood will
(a) result in clotting
(b) prevent clotting
(c) prevent oxidation of hemoglobin
(d) cause hemolysis

Question. In the cardiac cycle, diastole is
(a) the number of heart beats per minute
(b) the relaxation period after contraction of the heart
(c) the forceful pumping action of the heart
(d) the contraction period after relaxation of the heart.

Question. One of the difference between blood and lymph is that
(a) blood has RBCs and WBCs while lymph has Lymphocytes.
(b) blood has RBCs while lymph has no WBCs
(c) blood has WBCs while lymph has RBCs
(d) blood has dissolved organic salts while lymph has no such inorganic salt.

Question. Blood vessel carrying blood from lung to heart through
(a) Pulmonary artery
(b) Pulmonary vein
(c) Coronary artery
(d) None of these.

Question. Trachea do not collapse when there is not much air because they are:
(a) thick and muscular
(b) having cartilaginous rings
(c) have valves
(d) supported by larynx.

Question. Which region of the alimentary canal absorbs the digested food?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Liver

Question. The breakdown of pyruvate to give carbon di-oxide, water and energy takes place in
(a) cytoplasm
(b) mitochondria
(c) chloroplast
(d) nucleus

Question. The movement of food in phloem is called:
(a) transpiration
(b) translocation
(c) respiration
(d) evaporation

Question. Name the pores in a leaf through which respi-ratory exchange of gases takes place.
(a) Lenticels
(b) Vacuoles
(c) Xylem
(d) Stomata

Question. Name a circulatory fluid in the human body other than blood.
(a) Platelets
(b) RBC
(c) Lymph
(d) Plasma

Question.The part of the digestive system where no digestion takes place is
(a) ileum
(b) stomach
(c) mouth
(d) esophagus

Question. Normal blood pressure (systolic/diastolic) is
(a) 120/80 mm of Hg
(b) 160/80 mm of Hg
(c) 120/60 mm of Hg
(d) 180/80 mm of Hg

Question. The procedure used for cleaning the blood of a person by separating urea from it is called:
(a) osmosis
(b) filtration
(c) dialysis
(d) double circulation

Question. Assertion: All proteins in our food are digested in small intestine only.
Reason: The protein digesting enzymes are released onto small intestine.
(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. A blood vessel which pumps the blood from the heart to the entire body:
(a) artery
(b) capillary
(c) Vein
(d) Haemoglobin

Question. Assertion: Human heart does not allow mixing of oxygen reach blood with carbon dioxide reach blood.
Reason: Human heart has different chambers.
(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. Autotrophic organisms include
(a) bacteria and virus
(b) bacteria and fungi
(c) green plants and some bacteria
(d) green plants and all bacteria

Question. Name the tube which connects the kidneys to the urinary bladder.
(a) Urethra
(b) Nephron
(c) Tubule
(d) Ureter

Question. Observe the given diagram and answer the following question To test the release of CO₂ gas during respiration, the chemical used in test tube (Y) is

(a) Lime
(b) Lime water
(c) Calcium carbonate
(d) Marble

Question. In an experiment on photosynthesis, a portion of a leaf from de-starched potted plant was covered with opaque paper as shown below. ―A‖ shows a leaf covered with red strip, ―B with green strip, ―C with blue strip and ―D with black strip. When the starch test was done on the leaves after 4 hours, the result showed no starch in

(a) The portion covered with red, green and blue strips
(b) The portion covered with green strip
(c) The portion covered with black and blue strips
(d) Any of the covered portions

Question. The material used to make connections of the set-up air-tight is   
(a) Vaseline
(b) Oil
(c) Wax
(d) Glue

Question. A leaf from a de-starched plant is covered with black paper strip as shown below in X. Find the leaf which shows result after 8 hours of starch test

(a) C
(b) D
(c) B
(d) A

Question. Observe the given diagram and answer the following questions

Find X. Where X is a small test tube suspended inside the flask during experiment contains   
(a) Water
(b) Lime water
(c) Brine water
(d) Concentrated KOH solution

Question. The water level rises in the bent tube because   
(a) Germinating seeds consume all the oxygen and carbon dioxide
(b) Germinating seeds consume oxygen and give out carbon dioxide which is absorbed by KOH
(c) Carbon dioxide is given out by the germinating seeds
(d) Seeds need water for germination

Question. In plants, when the rate of photosynthesis equals the rate of respiration, it is called   
(a) Boiling point
(b) Transpiration
(c) Compensation point
(d) Freezing point

Question. Find out the reason for not yielding the expected result from the diagram of experimental set-up given below which demonstrates that ―CO₂ is given out during respiration

(a) The flask was not airtight
(b) There was no KOH in a test tube in the flask
(c) The delivery tube was dipped in water
(d) The germinating seeds were not immersed in water

Question. At levels of atmospheric O₂ below 1%, the amount of CO₂ released is relatively high. This is probably because   
(a) The Krebs cycle is very active
(b) O₂ is being converted to H₂O
(c) Alcohol fermentation is occurring
(d) Photosynthesis cannot function at night

Question. Respiration occurs only in living cells like germinating seeds because   
(a) Living cells need ATP
(b) Living cells have glucose
(c) Living cells have O₂
(d) All of these

Question. In the following sketch of the stomatal apparatus, the parts I, II, III and IV were labeled differently. Find the correct labeling out of the following.

(a) (I) Guard cell, (II) Stoma, (III) Starch granule, (IV) Nucleus
(b) (I) Cytoplasm, (II) Nucleus, (III) Stoma, (IV) Chloroplast
(c) (I) Guard cell, (II) Starch granule, (III) Nucleus, (IV) Stoma
(d) (I) Cytoplasm, (II) Chloroplast, (III) Stoma, (IV) Nucleus

Question. Find out the correctly focussed epidermal peel of leaf mounted under high power

(a) I
(b) II
(c) III
(d) IV

Question. At what time of the day do plants respire?   
(a) Plants respire only during night time
(b) Plants respire all the time
(c) Plants respire only during day time
(d) Plants do only photosynthesis but not respiration

Question. Before setting up an experiment to show that seeds release carbon dioxide during respiration, the seeds should be   
(a) Dried completely
(b) Boiled to make them soft
(c) Soaked in vinegar
(d) Kept moist till they germinate

Question. Find an equation to represent aerobic respiration.   
(a) C₆H₁₂O₆ + 6O₂ ——> 6CO₂ + 6H₂O + 38 ATP
(b) C₆H₁₂O₆ + 2O₂ ——> 12CO₂ + 6H₂O + 32 ATP
(c) C₆H₁₂O₆ + 12O₂ ——> 12CO₂ + 12H₂O + 30 ATP
(d) 2C₆H₁₂O₆ + 6O₂ ——> 6CO₂ + 6H₂O + 28 ATP

Question. Single circulation, i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by which of the following:
(a) hyla, rana, draco
(b) whale, dolphin, turtle
(c) labeo, chameleon, salamander
(d) hippocampus, exocoetus, anabas

Question. Which part of nephron allows the selective re absorption of useful substances like glucose, amino acids, salts and water into the blood capillaries?
(a) Tubule
(b) Glomerulus
(c) Bowman’s capsule
(d) Ureter

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 autotrophic mode of nutrition requires
(a) carbon dioxide and water
(b) chlorophyll
(c) sunlight
(d) all of the above

Question. Which of the following are chiefly digested in the stomach?
(a) Carbohydrates
(b) Proteins
(c) Lipids
(d) Fats

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

Question. The image shows the process of making food by a plant. 

Which statement can be concluded from the image?
(a) Plants absorb CO₂ from air and H2O from the soil as raw materials and convert them into glucose.
(b) Plants absorb O₂ from air and minerals from the soil as raw materials and convert them into heat energy.
(c) Plants absorb O₂ from air and glucose from the soil as raw materials and convert them into light energy.
(d) Plants absorb CO₂ from the soil and H₂O from air as raw materials and convert them into glucose.

Question. The type of nutrition followed in organisms like Cuscuta, ticks, lice, leeches and tapeworm is
(a) Saprotrophic
(b) Parasitic
(c) Autotrophic
(d) Diffusion

Question. The internal (cellular) energy reserve in autotrophs is
(a) Glycogen
(b) Protein
(c) Starch
(d) Fatty acid

Question. A student sets up an experiment to study the importance of nutrition in plants. The student takes 2 pots, pot 1 and pot 2 each with the same healthy plant. Both the pots were placed in the garden and watered properly. Pot 1 was kept as such, while pot 2 was kept in an air tight glass box with caustic soda. Caustic soda absorbs carbon dioxide present in the surrounding.
After 2 days, the student observes that the plant kept in the garden is healthy while the plant placed in container shed leaves and droops. What is the likely reason for this observation?
(a) Absence of oxygen for survival
(b) Absorption of light by caustic soda restricting growth
(c) Inability to perform photosynthesis
(d) Lack of nutrients in the soil

Question. A student sets up an experiment to study the photosynthesis in plants. The student destarched a potted plant by keeping it in a dark room for 3 days. Half of the portion of destarched leaf was placed in a bottle containing caustic potash (absorbs CO2) as shown.      

The student then places the plant in light and tests the leaf after 5 hours for the presence of starch. The portions inside the bottle shows negative starch test by reflecting no change in colour when react with iodine, however, other upper portions of the leaf gave positive starch test showing blue-black colour with iodine. What can be evaluated from this experiment?
(a) Lack of carbon dioxide increases amount of starch in plant.
(b) Carbon dioxide is necessary for preparing carbohydrate.
(c) Carbon dioxide is directly linked with the colour of leaf.
(d) Lack of carbon dioxide slows the process of photosynthesis.

Question. The image shows the bread moulds on a bread.
How these fungi obtain nutrition?
(a) By using nutrients from the bread to prepare their own food.
(b) By allowing other organisms to grow on the bread and then consuming them.
(c) By breaking down the nutrients of bread and then absorbing them.
(d) By eating the bread on which it is growing.

Question. The green colour of plants is due to the presence of
(a) Chlorophyll
(b) Carotene
(c) Xanthophyll
(d) Starch

Question. In leaves, the food gets stored in the form of
(a) Glucose
(b) Fructose
(c) Glycogen
(d) Starch

Question. The image shows how Amoeba obtains nutrition.        

How this process is advantageous for Amoeba?
(a) Capturing of food takes less time.
(b) More amount of food can be consumed.
(c) Complex food can be digested easily.
(d) Fast distribution of nutrition within the body.

Question. An incomplete equation for the digestion of starch using saliva is shown as: Saliva + Starch (in test tube) →
What will be the likely outcome of this?
(a) Saliva will breakdown starch into simple protein molecules.
(b) Saliva will convert starch into complex fat molecules.
(c) Saliva will breakdown starch into simple sugar molecules.
(d) Saliva will convert starch into complex sugar molecules.

Question. A student sets up an experiment to study the role of enzymes in digestion of food. 

In which test tube, the digestion of protein will occur?
(a) Test tubes A as pepsin will breakdown protein into simple molecules.
(b) Test tube B as HCl will breakdown protein into simple molecules.
(c) Test tube A as pepsin will breakdown into simple molecules.
(d) Test tube B as HCl will activate pepsin for breakdown of protein into simple molecules.

Question. The image shows the flow diagram for the breakdown of glucose in yeast. Under which condition these types of products are obtained?      

(a) In the presence of carbon dioxide
(b) In the absence of oxygen
(c) In the presence of oxygen
(d) In the absence of carbon dioxide

Question. The image shows the circulation of blood in fishes.      

Which option correctly traces the pathway of blood flow in fish body?
(a) Capillaries → heart → oxygenated blood → body cells → deoxygenated blood → heart →gills.
(b) Gill capillaries → oxygenated blood → body cells → deoxygenated blood → heart → gills.
(c) Gill capillaries → oxygenated blood → heart → body cells → deoxygenated blood → heart → gills.
(d) Gill capillaries → oxygenated blood → heart → body cells → deoxygenated blood → gills.

Question. The image shows the healing of a wound.  

Based on the image, what explains the process?
(a) Platelets form clot by plugging the site of injury.
(b) Red blood cells and platelets migrate to site of injury and secrete substance that forms new vessel.
(c) Platelets uses component of broken vessel to form clot.
(d) Red blood cells divide and replace the broken vessel at the site of injury.

Question. How water is taken up from soil to the xylem tissue of the plant roots?
(a) Roots act as a suction pump for taking water.
(b) Soil expels the water with pressure to the xylem.
(c) Xylem attracts water molecules.
(d) Difference in the ion concentration creates a gradient for water movement.

Question. Amoeba shows the following kind of nutrition
(a) Autotrophic
(b) Holozoic
(c) Saprotrophic
(d) Parasitic

Question. Temporary finger like extension on amoeba are called
(a) Cell membrane
(b) Cilia
(c) Pseudopodia
(d) Cytopharynx

Question. A student performs an experiment using a Balsam plant with intact stem, leaves, roots and flowers. The plant was kept in a test tube containing eosin solution (a pink colour dye). The test tube mouth was covered using cotton plug as shown.   

The student kept the plant undisturbed in the lab. After 2-3 hours, a transverse section of stem was obtained using sharp scissors and studied under microscope. The studies reveal the
presence of pink colour in the vessels of xylem. What does this observation explain?
(a) Most portion of the plant stem is occupied by xylem.
(b) Water moves through xylem in the plant.
(c) Eosin solution gets stored in the xylem.
(d) Xylem reacts with eosin and gives colour.

Question. The loss of water from the leaves of the plant is transpiration. How this process is advantageous for the plant?
(a) It helps maintain a constant level of water in the soil around the plant.
(b) It helps the plant to maintain temperature in hot sunny days.
(c) It helps in the downward movement of the water.
(d) It acts as a driving force for distribution of food in plant’s body.

Question. A student setup an experiment using a well-watered plant. The plant’s roots and soil were covered with a rubber sheet. The plant was then kept in a glass bell jar and sealed with vaseline at the bottom part to prevent the flow of air. The student keeps the apparatus in the light and observes water drops inside the jar after 2 hours as shown in the image.  

What can be evaluated about transpiration from this experiment?
(a) Plant leaves give off water in form of vapours.
(b) Plant absorbs water from environment thus extra water appears on the inside of jar.
(c) Heat from the outside warms the jar which melts the vaseline into vapours.
(d) Covered roots and stem of the plant decreases the temperature of jar resulting in condensation of moisture into vapours.

Question. The image shows the transport of food material inside plant body with the help of phloem. 

How is food transported from phloem to the tissues according to plants need?
(a) Food is transported in only direction like water in the plant body through xylem.
(b) Food is transported along with the water in plant’s body.
(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 image shows the movement of sucrose into phloem against the concentration gradient which also leads to the movement of water due to osmotic difference. This osmotic pressure allows movement of material in plant body.     

How the movement of sucrose into phloem takes place initially?
(a) With the help of ADP molecules
(b) With the help of transpiration
(c) With the help of ATP molecules
(d) With the help of water gradient

Question. The image shows the excretory system in humans.

What is the importance of the labelled part in excretory system?
(a) It filters waste from the blood.
(b) It carries urine from kidney to outside.
(c) It stores the urine till urination.
(d) It produces urine.

Question. The image shows the structure of a nephron.
Nephron is a unit of filtration in kidneys that filters waste material. It selectively reabsorbs or excretes water with the help of capillaries that surround it. What is the likely benefit of this?
(a) It helps to keep the output of urine constant throughout the day.
(b) It helps to uptake and store excess amount of water in the body for later use.
(c) It makes the process of filtration at Bowman’s capsule easier.
(d) It maintains the concentration of urine based on the amount of water present in the body.

Question. The image shows the process of photosynthesis in plants.
Based on the image, which component is excreted by plants during photosynthesis?
(a) Glucose
(b) Light energy
(c) Carbon dioxide
(d) Oxygen

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) Dropping down of fruits
(b) Expansion of roots into the soil
(c) Shedding of yellow leaves
(d) Shortening of stem

Question. Anaerobic process
(a) takes place in yeast during fermentation.
(b) takes place in the presence of oxygen.
(c) produces only energy in the muscles of human beings.
(d) produces ethanol, oxygen and energy.

Question. Most of the digestion and absorption of the food takes place in the
(a) small intestine
(b) liver
(c) stomach
(d) large intestine

Question. In the excretory system of human beings, some substances in the initial filtrate such as glucose, amino acids, salts and water are selectively reabsorbed in 
(a) Urethra
(b) Nephron
(c) Ureter
(d) Urinary bladder

Question. Pseudopodia are
(a) small hair-like structures present on unicellular organisms.
(b) false feet developed in some unicellular organisms.
(c) long, tube-like structures coming out of the mouth.
(d) suckers which are attached to the walls of the intestines.

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