Class : X Chapter.
5 Life processes
Subject: Biology
1. A pacemaker is meant for
(a) transporting heart (b) transplanting liver (c) heart initiation of heart beats.
(d) regulation of blood flow.
2. 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.
3. Veins can be differentiated from arteries because the veins
(a) have valves (b) have hard walls. (c) have pure blood in them. (d) have thick walls.
4. The function of the glomerulus and Bowman's capsule of the nephron is to
(a) reabsorb water into the blood. (b) eliminate ammonia from the body.
(c) reabsorb salts and amino acids. (d) filter the blood and collect the filtrate.
5. An advantage of excreting nitrogenous wastes in the form of uric acid is that –
(a) It is less toxic and reduces water loss and the subsequent need for water. (b) The
formation of uric acid requires a great deal of energy. (c) Uric acid is the first metabolic
breakdown products of acids. (d) Uric acid may be excreted through the lungs.
6. In the following sketch of stomatal apparatus, parts I, II, III and IV were labelled
differently by four students. The correct labelling is:
(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, III-nucleus, IV-stoma (d) I-cytoplasm, II-chloroplast,
III-stoma, IV-nucleus
7. The correct order of air reaching from atmosphere to the lungs is through
(a) external nares, larynx, trachea and air sac. (b) larynx, trachea, air sac and external nares.
(c) trachea, air sac, external nares and larynx. (d) air sac, trachea, larynx and external nares.
8. The rate at which oxygen moves from the alveoli of our lungs into our blood
(a) depends on the difference in oxygen concentration between the alveoli and the blood.
(b) depends on the color of the alveoli. (c) depends on the availability of energy to transport
gases across the membrane. (d) none of the above
9.Major function of contractile vacuole is
(c) Excretion (b) Circulation (c) Osmoregulation (d) All of these
10. Heart beat can be initiated by
(a) Sino-auricular node (b) Atrio-ventricular node (c) Sodium ion
(d) Purkinje's fibres Life Processes
11. Digestion of food in human starts from
(a) Duodenum (b) Small intestine (c) Mouth (d) Large intestine
12. Large intestine in man mainly carries out
(a) absorption (b) assimilation (c) digestion of fats (d) digestion of carbohydrates
13. In Amoeba the digestion is intracellular because
(a) Amoeba is unicellular (b) Amoeba is multicellular (c) Amoeba is found in a pond
(d) Amoeba is a microscopic animal
14.The process of transpiration in plants helps in:
(a) Opening of stomata (b) Absorption of CO, from atmosphere (c) Upward conduction of
water and minerals (d) Absorption of O₂ from atmosphere.
15. Erythropoesis may be stimulated by the deficiency of
(a) Iron (b) Oxygen (c) Protein (d) None of these
16. 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.
17. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm (b) mitochondria (c) chloroplast (d) nucleus
18. What is the term used when vessels open and let more blood through?
(a) Vasoconstriction (b) Vasodilatation (c) Increased permeability (d) None of these
19. The chief function of lymph nodes in mammalian body is to
(a) produce RBCS (b) collect and destroy pathogens (c) produce a hormone
(d) destroy the old and worn out red blood cells
20. 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.
21. In respiration, air passes through
(a) Pharynx nasal cavity larynx trachea → bronchi→ bronchioles (b) Nasal cavity pharynx larynx
trachea → bronchi→ bronchioles (c) Larynx nasal cavity pharynx trachea
(d) Larynx pharynx trachea → lungs
22. During deficiency of oxygen in tissues of human beings, pyruvic acid is converted
intolactic acid in the
(a) cytoplasm (b) mitochondria (c) chloroplast (d) golgi body
23. Choose the function of the pancreatic juice from the following?
(a) Trypsin digests proteins and lipase digests carbohydrates. (b) Trypsin digests emulsified
fats and lipase proteins. (c) Trypsin and lipase digest fats. (d) Trypsin digests proteins and
lipase emulsify fats.
24. Choose the correct statement that describes arteries.
(a) They have thick elastic walls, blood flows under high pressure, collect blood from different
organs and bring it back to the heart. (b) They have thin walls with valves inside, blood
flows under low pressure and carry blood away from the heart to various organs of the body.
(c) They have thick elastic walls, blood flows under low pressure, carry blood from the
heart to various organs of the body. (d) 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.
25. which activity is illustrated in the diagram of an Amoeba shown above?
(a) Ingestion (b) Digestion (c) Egestion (d) Assimilation
26. From the given picture of the digestive system, identify the part labelled as
gastric Glands.
(a) A (b) B (c) C (d) D
27. The diagram below represents a group of organs in the human body. Urine leaves the
urinary bladder by passing through this structure labelled-B
(a) A (b) B (c) C (d) D
28. Given alongside is a sketch of a leaf partially covered with black paper and which is
tobe used in the experiment to show that light is compulsory for the process of
photosynthesis. At the end of the experiment, which one IIf of the leaf parts labelled I, II
and III will become black when dipped in iodine solution?
(a) I only (b) II only (c) I and III (d) I and III
29. The phenomenon of normal breathing in a human being comprises.
(a) an active inspiratory and a passive expiratory phase. (b) a passive inspiratory and an
active expiratory phase. (c) both active inspiratory and expiratory phases.
(d) both passive inspiratory and expiratory phases.
30. Filteration unit of kidney is
(a) ureter (b) II only (c) neuron (d) nephron
31. A column of water within xylem vessels of tall trees does not break under its weight
because of:
(a) Tensile strength of water (b) Lignification of xylem vessels
(c) Positive root pressure (d) Dissolved sugars in water
32 Roots play insignificant role in absorption of water in:
(a) Pisti (b) Pea (c) Wheat (d) Sunflower
33. Which of the following statements is not correct?
(a) Goblet cells are present in the mucosa of intestine and secrete mucus. (b) Oxyntic cells
are present in the mucosa of stomach and secrete HCI. (c) Acini are present in the pancreas
and secrete carboxypeptidase. (d) Brunner's glands are present in the submucosa of
stomach and secrete pepsinogen.
34. Human urine is usually acidic because
(a) excreted plasma proteins are acidic. (b) potassium and sodium exchange generates
acidity. (c) hydrogen ions are actively secreted into the filtrate. (d) the sodium transporter
exchanges one hydrogen ion for each sodium ion in peri tubular capillaries.
35. Which one of the following animals has two separate circulatory pathways?
(a) Lizard (b) Whale (c) Shark (d) Frog
36. Cow has a special stomach as compared to that of a lion in order to
(a) absorb food in better manner. (b) digest cellulose present in the food.
(c) assimilate food in a better way. (d) absorb large amount of water.
37. Which of the following is not an enzyme?
(a) Lipase (b) Amylase (c) Trypsin (d) Bilirubin
38. Pancreatic juice contains more than one enzyme. Which among the following
combination is correct?
(a) Pepsin and Lipase (b) Amylase and Pepsin (c) Pepsin and Trypsin
(d) Trypsin and Lipase
39. Observe the experimental sets [A] C [B].Observe the test tube A C B. From the list given
below, choose the combination of responses of shoot and root that are observed in B
(a) Positive phototropism and positive geotropism (b) Negative phototropism and positive
geotropism (c) Positive phototropism and negative geotropism
(d) Only negative phototropism
40. Which one of the following organisms respires through the skin?
(a) Blue whale (b) Salamander (c) Platypus (d) Peacock
41. The first enzyme that the food encounters in human digestive system is
(a) Pepsin (b) Trypsin (c) Chymotrypsin (d) Amylase
42. Red blood corpuscles are formed in
(a) Liver (b ) Kidneys (c) Small intestine (d) Bone marrow
43. The Excretory units of Annelids are :
(a) Uniferous tubule (b ) Flame cells (c) Nephridia (d) Malpighian tubule
44. Open circulatory system is found in:
(a) Prawn (b) Snakes (c) Fish (d) Man
45. Haemoglobin is dissolved in Plasma of blood in:
(a) Earthworm (b) Roundworm (c) Tapeworm (d) Insects
46. Which one of the following organisms has a cellular respiratory pigment dissolved in
plasma and is also a predaceous carnivore and shows matriphagy?
(a) Scorpion (b) Cockroach (c) Earthworm (d) Sea cucumber
47. Glucose is the prime source of energy in our body. However, it is stored in the form of
glycogen in the muscle and liver of animals and in the form of starch in plants. As a result,
everytime a cell requires glucose, it must hydrolyze glycogen which is an energy consuming
process. Why does the cell store glycogen instead of 5 glucose in free form?
(a) Glycogen is more compact and more hydrophilic. (b) Storage of glucose in free form will
consume more ATP. (c) Glucose in the free form creates more osmotic pressure.
(d) Glucose is highly reactive molecule hence storing in the free form can result in unwanted
reactions in the cells.
48. A squirrel was eating a fruit on the ground. Suddenly, it was attacked by a dog. The
squirrel rushed to the tree immediately and saved itself from the dangerous attack. What
immediate changes are most likely to have taken place in the body of the squirrel?
A. Blood flows to the stomach for rapid
B. Adrenaline was secreted in the blood by the adrenal glands.
C. Heart beat becomes faster and pumps more blood so that muscles get more oxygen.
D. Adrenocorticotropic hormone is secreted in the blood and blood flows more towards the
vital organs.
Select the correct combination of options given below:
(a) A and B (b) A and C (c) B and C (d) C and D
49. Removal of the pancreas impairs the breakdown of
(a) lipids and carbohydrates only (b) lipids and proteins only (c) lipids, proteins and
carbohydrates (d) proteins and carbohydrates only
50. Microscopic examination of a blood smear reveals an abnormal increase in the number
of granular cells with multiple nuclear lobes. Which one of the following cell Types has
increased in number?
(a) Lymphocytes (b) Neutrophils (c) Monocytes (d) Thrombocytes
51. Which one of the following metabolic conversions requires oxygen?
(a) Glucose to pyruvate (b) Glucose to CO, and ethanol (c) Glucose to lactate
(d) Glucose to CO₂ and H₂O
52. Which one of the following organs is NOT a site for the production of white blood cells?
(a) Bone marrow (b) Kidney (c) Liver (d) Spleen
53. Which of the following process occur only in animals?
(a) Respiration (b) Nutrition (c) Nervous control (d) Hormonal control
54. Tricuspid valve is present in
(a) Right atria and right ventricle (b) Left atria and left ventricle
(c) Wall of atrium (d) Wall of vetricle
55. Root pressure is effective way transporting water in xylem. This pressure is generated
(a) In bright sunlight (b) During night (c) At very low temperature (d) In high trees.
DIRECTIONS: Study the given case/passage and answer the following questions.
Case/Passage-1
There is a pair of bean-shaped organs P in the human body towards the back, just above
the waist. A waste product Q formed by the decomposition of unused proteins in the liver is
brought into organ P through blood by an artery R. The numerous tiny filters S present in
organ P clean the dirty blood by removing the waste product Q. The clean blood goes into
circulation through a vein T. The waste substance Q, other waste salts, and excess water
form a yellowish liquid U which goes from organ P into a bag-like structure V through two
tubes W. This liquid is then thrown out of the body through a tube X.
56. What is (1) organ P, and (ii) waste substance Q?
57. Name (i) artery R, and (ii) vein T.
58. What are tiny filters S known as?
59. Name (1) liquid U (ii) structure V (iii) tubes W, and (iv) tube X.
Case/Passage - 2
All living cells require energy for various activities. This energy is available by the
breakdown of simple carbohydrates either using oxygen or without using oxygen.
60. Energy in the case of higher plants and animals is obtained by
(a) Breathing (b) Tissue respiration (c) Organ respiration (d) Digestion of food
61. The graph below represents the blood lactic acid concentration of an athlete during a
race of 400 m and shows a peak at point D. Lactic acid production has occurred in the
athlete while running in the 400 m race
Respiration in athletics
The blood of an athlete was tested before, during and after a 400m race:
62. Lactic acid production has occurred in the athlete while running in the 400 m
race. Which of the following processes explains this event?
(a) Aerobic respiration (b) Anaerobic respiration (c) Fermentation (d) Breathing
Study the graph below that represents the amount of energy supplied with respect to the
time while an athlete is running at full speed.
Choose the correct combination of plots and justification provided in the following table.
63. 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
64. Study the table below and select the row that has the incorrect information.
Aerobic Anaerobic
(a) Location Cytoplasm Mitochondria Mitochondria
(b) End Porduct CO, and H₂O Ethanol and CO₂
(c) Amount of ATP High Amount of ATP High Low
(d) Oxygen Needed Not Needed
DIRECTIONS: Each of these questions contains an assertion followed by reason. Read
them carefully and answer the question on the basis of following options. You have to
select the one that best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation
of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
(c) If Assertion is correct but Reason is incorrect. (d) If Assertion is incorrect but Reason is
correct.
65. Assertion: Blood of insects is colourless.
Reason: The blood of insect does not play any role in transport of oxygen.
66. Assertion: Blood pressure is arterial blood pressure.
Reason: It is measured by sphygmomanometer.
67. Assertion: Chloroplast help in photosynthesis.
Reason: Mitochondria have enzymes for dark reaction.
68. Assertion: During physiology of excretion, deamination does not take place in liver.
Reason: Deamination is a process to make use of excess of amino acids which can not be
incorporated into protoplasm.
69. Assertion: Photorespiration decreases net photosynthesis.
Reason: Rate of respiration in dark and light is almost same in all plants.
70. Assertion (A) : Plants lack excretory organs.
Reason (R) : Plants usually absorb essential nutrients.
71. Assertion (A) : In anaerobic respiration, one of the end product is alcohol.
Reason (R) : There is an incomplete breakdown of glucose.
72. Assertion (A) : Carbohydrate digestion mainly takes place in small intestine.
Reason (R) : Pancreatic juice contains the enzyme lactase.
73. Assertion (A) : Aerobic respiration requires less energy as compared
to anaerobic respiration.
Reason (R) : Mitochondria is the powerhouse of the cell.
74. Assertion (A): Energy is required to carry out different life processes.
Reason (R) : Energy is obtained in the form of ATP in the mitochondria.
75. Assertion (A): Pyruvate is a six-carbon molecule
Reason (R) : It is prepared in the cytoplasm as the first step to cellular respiration
DIRECTIONS: Each question contains statements given in two columns which have to be
matched. Statements (A, B, C, D) in column I have to be matched with statements (p, q, r, s)
in column II.
76.
Column I Column II
(A) (p) Leech
Autotrophic nutrition
(B) (q)
Heterotrophic Paramaecium
nutrition
( r) Deer
(C) Parasitic
nutrition
(D) Digestion (s) Green
in food plant.
77.
Column I Column II
(A) Fish (p) Trachea
(B) Birds (q) Gills
( C) Aquatic (r) Lungs
(D)
Earthworm (s) Moist
cuticle
78.
Column 1 Column 2
(A) (p)The
Regulation removal of
metabolic waste from
an organism
(B) (q)The
Reproduction chemical
process of
oxidizing
organic
molecules
to release
energy.
(C) (r) The
Respiration replication
of an
organism.
(D) Excretion (s) The
control and
coordination
of chemical
processes
within the
organism.
79.
Column1 ColumnII
(A) (p) The
Stomach structure is
the site
where the
chemical
breakdown
of proteins
first
occurs.
(B) Large (q) This
intestine organ
absorbs
most of the
water from
the
undigested
food.
(C) Small (r) This
intestine organ is the
section of the
alimentary
canal where
most of the
food is
absorbed into
the blood.
( d) liver (s) This
organ
secretes the
chemical
bile, which is
used to
emulsify fats.
80. What prevents back flow of blood inside the heart during contraction?
(a) Valves in heart (b) Thick muscular walls of ventricles (c) Thin of atria (d ) All of these
81. Assertion: Plants have low energy needs
Reason: Plant bodies have large proportion dead cells.
82.Assertion: Valves have arteries present in them
Reason: Arteries carry oxygenated blood from heart to different body parts except
pulmonary artery
83. If salivary amylase is lacking in the saliva, which of the following events in the mouth
cavity will be affected?
(a) Proteins breaking down into amino acids (b) Starch breaking down into sugars.
(c) Fats breaking down into fatty acids and glycerol. (d) Absorption of vitamins.
84. Which of the following is not correct regarding the function of lymph?
(a) It transports digested and absorbed fat from the stomach.
(b) It drains excess fluid from the extra cellular space.
(c) It transports WBC to extracellular spaces where blood cannot reach,
hence helping in the immune (d) Transports RBCs
85. In the experiment the student places candle and living cockroach in the flask A while
the candle and dead cockroach in flask B the burning of candle needs oxygen
After 10 minutes the student observes that the candle in flask A extinguishes faster where
as in flask keeps burning for a longer time what can be evaluated from this experiment?
(a) Water vapour produced by living beings prevents burning of candle
(b) Living beings consume oxygen during respiration
(c) Burning of candle decreases the lifespan of cockroach
(d) Candle produces high amount of carbon dioxide
86. Choose the correct statement that describes arteries.
(a) They have thick elastic walls, blood flows under high pressure; collect blood from
different organs and bring it back to the heart
(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 thick elastic walls without valves inside, blood flows under high
pressure and carry blo away from the heart to different parts of the body
(d) They have thin walls with valves inside, blood flows under low pressure and carry
blood away fro the heart to various organs of the body.
87. A person can choke when a piece of food becomes lodged in the pipe blocking the flow
of air, a first aid procedure to remove the blheimlich manoeuvre described below:
By performing this procedure, the piece of food is pushed out of the windpipe which of the
following causes this to happen:
(a) The expansion of the chest. (b) The air pressed out of the lungs (c) The food pressed out of
the stomach. (d) The upward movement of the wall of the food pipe.
88. A student performs an experiment using a Balsam plant with intact stem, leaves, roots
and flowers. The plant kept in a test tube containing cosin 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 us 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.
89. A student covered a leaf from a de-starched 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 the student was trying to show that:
(a) CO2 is given out during respiration (b) CO2 is necessary for photosynthesis
(c) Chlorophyll is necessary for photosynthesis (d) Light is necessary for photosynthesis
90. Identify the type of nutrition exhibited in the following figure
(a) Saprophytic Nutrition (b) Parasitic Nutrition (c) Symbiotic Nutrition
(d) Autotrophic Nutrition
91. From Which structure, the free Oxygen gas produced during photosynthesis is
released?
A.Epidermis B.stomata C.cortex D.guard cells
92. If salivary amylase is lacking in the Saliva, which of the following events in the mouth
cavity will be affected.
A. Proteins breaking down into amino acids B. Starch breaking down into sugars
C. Fats breaking down into fatty acids and glycerol D. Absorption of vitamins
93.When carrying out the starch test on a leaf, why is it important to boil the leaf in
alcohol?
A.To dissolve the waxy cuticle B. To make the cells more permeable to iodine
solution C. To remove the chlorophyll D. To stop chemical reactions in the cells.
94. Internal respiration may be defined as
a. Breathing in and releasing of oxygen in the tissue b. The oxidation of food substances to
release energy C.The building up (synthesis) of complex substances
d. Getting Rid of carbon dioxide that would accumulate in the tissue.
95. It has been found that people living in very high mountains have many more red
corpuscles in their blood than people living in plains. Which one of the following best accounts
for this phenomenon
A. The cold climate stimulates the production of red corpuscles to keep the body warm
B. People of high mountains breathe more quickly C. The lower air pressure requires more red
corpuscles to supply the body cells with oxygen D. The lower air pressure in high mountains
speeds up the blood circulation so that more red corpuscles are needed.
96 Assertion (A) : In anaerobic respiration, one of the end product is alcohol.
Reason (R) : There is an incomplete breakdown of glucos,
97 ssertion (A) : In plants there is no need of specialised respiratory organs.
Reason (R) : Plants do not have great demands of gaseous exchange
98. Assertion (A): Arteries are thick-walled and elastic in nature.
Reason (R) : Arteries have to transport blood away from the heart.
99. Assertion (A): Energy is required to carry out different life processes.
Reason (R) : Energy is obtained in the form of ATP in the mitochondria
100.Assertion (A): Pyruvate is a six-carbon molecule
Reason (R) : It is prepared in the cytoplasm as the first step to cellular respiration
