CBSE Class 10 Biology Life Processes MCQs

Answer : B

Question. The process of an artificial kidney that is used to remove nitrogenous waste products from blood is called
(a) Excretion
(b) Dialysis
(c) Filtration
(d) Absorption

Answer : B

Question. Normal blood pressure (Systolic / Diastoli(c) 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

Answer : A

Question. The main function of the ureter is to
(a) Control the pressure of urine in urinary bladder
(b) Take urine from kidneys to urinary bladder
(c) Filter blood and remove it to urine
(d) Connect the parts of excretory system

Answer : B

Question. When air is blown from mouth into a test tube containing lime water, the lime water turns milky due to the presence of
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Water vapour

Answer : B

Question. After wound or cut in a body blood coagulates through
(a) WBC
(b) RBC
(c) Platelets
(d) Plasma

Answer : C

Question. The chemical required to show that CO₂ gas is released during respiration is
(a) Potassium bicarbonate
(b) Potassium dichromate
(c) Potassium permanganate
(d) Potassium hydroxide 

Answer : D

Question. The sphincter muscles that help in regulating the exit of food from stomach into the small intestine is
(a) Pyloric sphincter
(b) Ileocecal sphincter
(c) Cardiac sphincter
(d) Anal sphincter

Answer : A

Question. Blood from the superior vena cava flows into
(a) Right atrium
(b) Right ventricle
(c) Left atrium
(d) Left ventricle

Answer : A

Question. The correct pathway of blood in circulatory system is
(a) Atria → Ventricles → Arteries → Veins
(b) Ventricles → Atria → Veins → Arteries
(c) Ventricles → Veins → Arteries → Atria
(d) Veins → Ventricles → Atria → Arteries

Answer : A

Question. A large quantity of one of the following is removed from our body by lungs
(a) CO₂ and H₂O
(b) CO₂ only
(c) H₂O only
(d) Ammonia

Answer : A

Question. Villi present on the inner lining of the intestinal wall
(a) Secretes enzymes for digestion
(b) Secretes hormones
(c) Decreases the surface area for absorption
(d) Increases the surface area for absorption

Answer : D

Question. The force that blood exerts against the wall of a vessel is called
(a) Systolic pressure
(b) Diastolic pressure
(c) Blood pressure
(d) None of these

Answer : C

Question. In normal expiration, the diaphragm is
(a) Arched
(b) Flattened
(c) Perforated
(d) None of the above

Answer : A

Question. The backflow of blood inside the heart during contraction will b prevented by
(a) Valves in heart
(b) Thick muscular walls of ventricles
(c) Thin walls of atria
(d) All of the above

Answer : A

Question. The kidneys in human beings are a part of the system for
(a) Nutrition
(b) Respiration
(c) Excretion
(d) Transportation

Answer : C

Question. Book lungs are respiratory organs of :- 
(a) Scorpion
(b) Crustaceans
(c) Insects
(d) Centipedes

Answer: A

Question. Structure which prevents the entry of food in the wind pipe is :- 
(a) Pharynx
(b) Glottis
(c) Gullet
(d) Epiglottis

Answer: D

Question. During hibernation, frog respires by :- 
(a) Only skin
(b) Only lungs
(c) Only buccopharyngeal cavity
(d) Partly skin and partly lungs

Answer: A

Question. If the pancreatic duct is blocked an hour after one has taken his food, which one of the following will not be affected? 
(a) Carbohydrate digestion
(b) Neutralisation of chyme
(c) Breakdown of proteins
(d) Maintenance of normal blood sugar level

Answer: D

Question. The blood vascular system of mammals is known as double vascular system because :- 
(a) A group of veins carry oxygenated blood and other group conducts deoxygenated blood
(b) Oxygenated blood runs from heart to different organs by one set of veins, while deoxygenated blood runs from heart to lungs by another set
(c) Two different blood runs never meet
(d) All of these

Answer: D

Question. Painful breathing is called :- 
(a) Eupnoea
(b) Hypopnoea
(c) Apnoea
(d) Dyspnoea

Answer: D

Question. In Hydra and Amoeba, ammonia is the main nitrogenous waste. Lizards, snakes, birds and insects excrete mostly uric acid but crocodiles and alligators excrete mainly ammonia though they are reptiles. So can we generalise that :- 
(a) there is no uniform pattern of removal of nitrogen wastes
(b) aquatic and land animals excrete urea
(c) animals that fly excrete uric acid
(d) nitrogen waste excretion is closely related to the availability of water in the environment

Answer: D

Question. A patient suffering from hepatitis is advised to restrict the intake of fats and proteins and take carbohydrates only because 
(a) carbohydrates are easy to digest
(b) facts and proteins are not digested
(c) emulsification of fat and deamination are retarded
(d) Facts and proteins are complex substances.

Answer: C

Question. The opening of auricle into ventricle on the right side is guarded by :- 
(a) Tricuspid valve
(b) Semilunar valves
(c) Bicuspid valve
(d) Eustachius valve

Answer: A

Question. Urine leaves the kidney through :- 
(a) Urethra
(b) collecting duct
(c) renal vein
(d) ureter

Answer: D

Question. Principal inspiratory muscle is :- 
(a) External intercostal
(b) Internal intercostal
(c) Abdominal
(d) Phrenic

Answer: D

Question. The matrix of chloroplast is known as :- 
(a) Grana
(b) Stroma
(c) Thylakoid
(d) Lamellae

Answer: B

Question. How the transport of O₂ and CO₂ by blood occurs :- 
(a) With the help of RBCs and blood plasma
(b) With the help of RBCs and WBCs
(c) With the help of WBCs and blood serum
(d) With the help of platelets and corpuscles

Answer: A

Question. RBCs are generally destroyed in the liver, while WBCs are destroyed in :- 
(a) Plasma
(b) Lymph
(c) Inside various cells of body
(d) Outside the blood stream

Answer: D

Question. Cold blooded animals are those animals in which:- 
(a) blood is cold
(b) the temperature of the body varies according to the temperature of the surroundings
(c) body temperature always remains constant
(d) the body is cold to touch

Answer: B

Question. Ptyalin is secreted by :- 
(a) Salivary glands
(b) Brunner's glands
(c) Gastric galnds
(d) Digestive glands

Answer: A

Question. Air bladder or swim bladder in fishes is associated with :- 
(a) hydrostasis
(b) gaseous exchange
(c) sound production
(d) All of the above

Answer: D

Question. The main function of the skin is to protect the underlying delicate tissues from environmental factors ; in addition, it performs several other functions. Some are given below. Which of the following functions is excretory in nature ? 
(a) Giving out of urea and uric acid in sweat
(b) Detection of changes in temperature
(c) Regulation of body temperature
(d) Detection of pressure, pain or touch etc

Answer: A

Question. Human heart is :- 
(a) Three chambered
(b) Four chambered
(c) Excretory organ
(d) Osmoregulatory organ

Answer: B

Question. In which form, CO₂ is carried by blood :- 
(a) Sodium bicarbonate
(b) Sodium carbonate
(c) Potassium carbonate
(d) Magnesium carbonate

Answer: A

Question. Amount of oxygen which is transported by one gram of haemoglobin is :- 
(a) 20 ml
(b) 13.4 ml
(c) 1.34 ml
(d) None of these

Answer: C

Question. Match the structures listed under column-I with the functional names given under column-II. Choose the correct answer which gives correct conbination of the alphabets of the two columns :- 
 
(a) A = r, B = t, C = q, D = s
(b) A = r, B = s, C = p, D = q
(c) A = r, B = s, C = q, D = t
(d) A = r, B = s, C = q, D = p

Answer: D

Question. The functional respiratory organ of a fully formed tadpole is the 
(a) skin
(b) lung
(c) gill
(d) air bladder

Answer: C

Question. Release of pancreatic juice is stimulated by :- 
(a) Enterokinase
(b) Cholecystokinin
(c) Gastrin
(d) Secretin

Answer: D

Question. One common feature of trachea of rabbit and trachea of cockroach is that :- 
(a) Both are paired and branched
(b) Both have ciliated epithelium
(c) Both originate in pharynx in head region
(d) Both have non-collapsible walls

Answer: D

Question. A 2-layered sac surrounding the lung is :- 
(a) Pericardium
(b) Pleura
(c) Perichondrium
(d) Periosteum

Answer: B

Question. Which of the following statement correctly defines Bohr's effect :- 
(a) Rise of P₅₀ with a decrease in CO₂ conc.
(b) Rise in P₅₀ with a decrease in pH
(c) Rise of P₅₀ with a decrease in pH
(d) Fall in P₅₀ with a decrease in pH

Answer: D

Question. Digestion is 
(a) conversion of large food particles in to small food particles
(b) conversion of small food particles into large food particles
(c) conversion of food into protoplasm
(d) conversion of non-diffusible food particles into diffusible food

Answer: D

Question. Chemical basis of action of nerve on heart beat was discovered by :- 
(a) Otto Loewi
(b) Pavlov
(c) Harvey
(d) Landsteiner

Answer: A

Question. Second heart sound is :- 
(a) 'Lub' at the end of systole
(b) 'Lub' at the beginning of systole
(c) 'Dub' at the end of diastole
(d) 'Dub' at the beginning of diastole

Answer: D

Question. The dirty blood in our body gets filtered in
(a) Lungs
(b) Heart
(c) Kidney
(d) Ureter

Answer : C

Question. Artificial kidneys contain a number of tubes with a lining made of
(a) Cell membrane
(b) Capsule
(c) Semi-permeable membrane
(d) None of these

Answer : C

Question. Choose the correct path of urine in our body
(a) Kidney → Ureter → Urethra → Urinary → bladder
(b) Kidney → Urinary → bladder → Urethra → Ureter
(c) Kidney → Ureter → Urinary → bladder → Urethra
(d) Urinary → bladder → Kidney → Ureter → Urethra

Answer : C

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

Answer : D

Question. Cell organelle that stores some waste material is
(a) Chloroplast
(b) Mitochondria
(c) Vacuole
(d) Nucleus

Answer : C

Question. The largest amounts of nitrogen excreted from a mammalian body through
(a) Breath
(b) Sweat
(c) Urine
(d) Faeces

Answer : C

Question. The nutrient that are chiefly digested in the stomach are
(a) Carbohydrates
(b) Proteins
(c) Fats
(d) Lipids

Answer : B

Question. The fermentation of glucose by yeast normally yields
(a) Alcohol, CO₂ and 36 ATP
(b) CO₂, H₂O and 36 ATP
(c) Alcohol, CO₂ and 2 ATP
(d) Lactic acid, CO₂ and 2 ATP

Answer : C

Question. In human each kidney has large numbers of filtration units called ___
(a) Nephrons
(b) Neutrons
(c) Neurons
(d) Neptune

Answer: A

Question. The transport of soluble products of photosynthesis is called translocation and it occurs in the part of the vascular tissue called
(a) Phloem
(b) Xylem
(c) Sclerenchyma
(d) Collenchyma

Answer: A

Question. Right part of the human heart contains
(a) Deoxygenated blood
(b) Oxygenated blood
(c) Mixed blood
(d) No blood

Answer: A

Question. Among the following, which vertebrate group / groups heart does not pump oxygenated blood to different parts of the body
(a) Pisces and Amphibians
(b) Amphibians and Reptiles
(c) Amphibians only
(d) Pisces only

Answer : D

Question. In a closed circulatory system, blood is completely enclosed within
(a) Vessels
(b) Heart
(c) Skeleton
(d) Sinuses

Answer : B

Question. The element used in the synthesis of proteins is
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide

Answer : C

Question. Choose the forms in which most plants absorb nitrogen
i) Proteins ii) Nitrates and Nitrites iii) Urea iv) Atmospheric nitrogen
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Answer : B

Question. 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 lactic acid
(b) Formation of acetic acid
(c) Formation of Pyruvic acid
(d) Formation of Hydrochloric acid

Answer: A

Question. During cellular respiration one molecule of glucose is first broken down into two molecules of ________
(a) Pyruvic acid
(b) Acetic acid
(c) Lactic acid
(d) None of the above

Answer: A

Question. 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

Answer: A

Question. The enzyme Pepsin is inactive in stomach without the presence of
(a) Hydrochloric acid
(b) Nitric Acid
(c) Acetic acid
(d) Butyric acid

Answer: A

Question. The nutrient that is not selectively reabsorbed in nephron is
(a) Glucose
(b) Amino acids
(c) Salts
(d) Carbohydrates

Answer : D

Question. Blood pressure is measured by an instrument called
(a) Barometer
(b) Sphygmomanometer
(c) Photometer
(d) Manometer

Answer : B

Question. Select the most appropriate sequence for aerobic respiration
(a) Glucose ^Mitochondria → Pyruvate ^Cytoplasm → CO₂ + H2O + Energy
(b) Glucose ^Cytoplasm → Pyruvate ^Mitochondria → CO₂ + H2O + Energy
(c) Glucose ^Cytoplasm → Pyruvate + Energy ^Mitochondria → CO₂ + H₂O
(d) Glucose ^Cytoplasm → Pyruvate + Energy ^Mitochondria → CO₂ + H₂O + Energy

Answer : D

Question. When blood is forced into the artery, wave like expansion takes place is called
(a) Heart beat
(b) Pulse
(c) Flow
(d) Ticking

Answer : B

Question. Lack of oxygen in muscles often leads to cramps among cricketers. This results due to
(a) Conversion of pyruvate to ethanol
(b) Conversion of pyruvate to glucose
(c) Non conversion of glucose to pyruvate
(d) Conversion of pyruvate to lactic acid

Answer : D

Question. On seeing good food our mouth waters. This fluid is actually
(a) Enzyme
(b) Water
(c) Hormone
(d) None of the above

Answer: A

Question. When water enters the guard cells the stomata
(a) Opens
(b) Closes
(c) Open or closes
(d) No effect

Answer: A

Question. In Photosynthetic process, atmospheric carbon di oxide is _______ to carbohydrates
(a) Reduced
(b) oxidised
(c) Neutralised
(d) Burnt

Answer: A