Download LIFE PROCESSES :QUIZ

LIFE PROCESSES :QUIZ
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which
o
o
o
o
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life processes converts chemichal energy into heat energy
Nutrition
Respiration
Transpiration
Excretion
ANSWER: respiration
In which of the following groups of organisms, food material is
broken down outside the body and absorbed?
O Mushroom, green plants, Amoeba
O Yeast, mushroom, bread mould
O Paramecium, Amoeba, Cuscuta
O Cuscuta, lice, tapeworm
ANSWER: (b) Yeast, Mushroom, bread mould [These are
saprotrophs, and digestion in saprotrophs takes place before
ingestion.]

Select the correct statement
O
Heterotrophs do not synthesize their own food.
O
Heterotrophs utilise solar energy for photosynthesis
O
Heterotrophs synthesise their own food.
O
Heterotrophs are capable of converting carbon dioxide and water
into carbohydrates
ANSWER: (a) Heterotrophs do not synthesize their own food
[Other options show features of autotrophic nutrition.]
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Which of the following statements about the autotrophs is incorrect?
O
They synthesise carbohydrates from carbon dioxide and water
in the presence of sunlight and chlorophyll.
O
They store carbohydrates in the form of starch.
O
They convert carbon dioxide and water into carbohydrates in the
absence of sunlight.
O
They constitute the first trophic level in food chains.
ANSWER: (c) They convert carbon dioxide and water into
carbohydrates in the absence of sunlight

Which is the correct sequence of parts in human alimentary canal?
O Mouth → stomach→ s all i testi e → oesophagus → large
Intestine
O
O
O
Mouth →oesophagus → sto a h → large i testi e → s all
Intestine
Mouth → sto a h → oesophagus → s all i testi e → large
Intestine
Mouth → oesophagus → sto a h → s all i testi e → large
Intestine
ANSWER: d Mouth → oesophagus → sto a h → s all i testi e
→ large i testi e
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If salivary amylase is lacking in the saliva, which of the following events
in the mouth cavity will be affected?
O Proteins breaking down into amino acids
O Starch breaking down into sugars
O Fats breaking down into fatty acids and glycerol
O Absorption of vitamins
ANSWER: (b) Starch breaking down into sugars [Salivary amylase
digests starch. Hence, its absence will hamper digestion of starch.]
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The inner lining of stomach is protected by one of the following from
hydrochloric acid. Choose the correct one
O
Pepsin
O Mucus
O Salivary amylase
O Bile
ANSWER: (b) Mucus

Which part of alimentary canal receives bile from the liver?
O
Stomach
O
Small intestine
O
Large intestine
O
Oesophagus
ANSWER: (b) Small intestine [Bile comes to the small
intestine through hepato-pancreatic duct.]

A few drops of iodine solution were added to rice water. The solution
turned blue-black in colour. This indicates that rice water contains
O
Complex proteins
O
Simple proteins
O
Fats
O
Starch
ANSWER: (d) Starch [Starch makes a dark blue complex
with iodine.]
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In which part of the alimentary canal food is finally digested?
O
Stomach
O
Mouth cavity
O
Small intestine
O
Large intestine
ANSWER: (c) Small intestine [Major part of digestion takes place
in small intestine; where digestion is completed.]

Choose the function of the pancreatic juice from the following
O
Trypsin digests proteins whereas lipase digests carbohydrates
O
Trypsin digests emulsified fats whereas lipase digestes proteins
O
Trypsin and lipase digests fats
O
Trypsin digests proteins whereas lipase emulsifies fats
ANSWER: (d) Trypsin digests proteins and lipase emulsifies fats
When air is blown from mouth into a test-tube containing lime water,
the lime water turned milky due to the presence of
O Oxygen
O Carbon dioxide
O Nitrogen
O Water vapour
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ANSWER: (b) Carbon dioxide [Carbon dioxide reacts with
limewater to form calcium carbonate. Insoluble calcium
carbonate is responsible for appearance of white colour.]
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Which of the following statement(s) is (are) true about respiration?
O
During inhalation, ribs move inward and diaphragm is raised
O
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
O
Haemoglobin has greater affinity for carbon dioxide than oxygen
O
Alveoli increase surface area for exchange of gases
 (1) and (4)
 (2) and (3)
 (1) and (3)
 (2) and (4)

ANSWER: (d) (2) and (4)
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Which is the correct sequence of air passage during inhalation?
Nostrils → lary → phar
→ tra hea → lu gs
O
Nasal passage → tra hea → phar
→ lar → alveoli
O
Lar → ostrils → phar
→ lu gs
O
Nostrils → phar
→ lar → tra hea → alveoli
O
ANSWER: a Nostrils → lar

→ phar
→ tra hea → lu gs
During respiration exchange of gases take place in
Trachea and larynx
O
O
O
O
Alveoli of lungs
Alveoli and throat
Throat and larynx
ANSWER: (b) Alveoli of lungs
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Which of the following statement (s) is (are) true about heart?
O
Left atrium receives oxygenated blood from different parts of
body while right atrium receives deoxygenated blood from lungs
O
Left ventricle pumps oxygenated blood to different body parts
while right ventricle pumps deoxygenated blood to lungs
O
Left atrium transfers oxygenated blood to right ventricle
which sends it to different body parts
O
Right atrium receives deoxygenated blood from different parts of
the body while left ventricle pumps oxygenated blood to
different parts of the body.
 (1)
 (2)
 (2) and (4)
 (1) and(3)
ANSWER: (c) (2) and (4) [Deoxygenated blood flows
through the right side of the heart. Oxygenated blood flows
through the left side of the heart.]
What prevents backflow of blood inside the heart during contraction?
O
Valves in heart
O
Thick muscular walls of ventricles
O
Thin walls of atria
O
All of the above
ANSWER: (a) Valves in heart

Single circulation i.e.( blood flows through the heart only once
during the passage through the body) is exhibited by
O
O
O
O
Labeo, Chameleon, Salamander
Hippocampus, Exocoetus, Anabas
Hyla, Rana, Draco
Whale, Dolphin, Turtle
ANSWER: (b) Hippocampus, Exoceotus, Anabas [These
animals belongs to pieces. Single circulation is found in
fishes.]
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In which of the following vertebrate group/groups, heart does not
pump oxygenated blood to different parts of the body?
O
Piesces and Amphibians
O
Amphibians and Reptiles
O
Amphibians only
O
Piesces only
ANSWER: (d) Piesces only [In fishes, heart sends the blood to
gills from where blood is circulated to different organs.]
. Choose
O
O
O
O
the correct statement that describes arteries.
They have thick elastic walls, blood flows under high pressure;
collect blood from different organs and bring it back to the heart
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
They have thick elastic walls, blood flows under low pressure;
carry blood from the heart to various organs of the body
They have thick elastic walls without any valves inside, blood
flows under high pressure and carry blood away from the
heart to different parts of the body.
ANSWER: (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.

The filtration units of kidneys are called
O
O
O
O
Urethra
Ureter
Neurons
Nephrons
ANSWER: (d) Nephrons

Oxygen liberated during photosynthesis comes from
O
Water
O
Chlorophyll
O
Carbon dioxide
O
Glucose
ANSWER: (c) water
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The blood leaving the tissues becomes richer in
O
Carbon dioxide
O
Water
O
Haemoglobin
O
Oxygen
ANSWER: (a) Carbon dioxide
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Which of the following is an incorrect statement?
O
Organisms grow with time
O
Organisms must repair and maintain their structure
O
Movement of molecules does not take place among cells
O
Energy is essential for life processes
ANSWER:(c) Movement of molecules does not take place
among cells
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The internal (cellular) energy reserve in autotrophs is
O
Glycogen
O
O
O
Protein
Starch
Fatty acid
ANSWER: (c) Starch [Plants store food in the form of starch]

Choose the event that does not occur in photosynthesis
O
Absorption of light energy by chlorophyll
O
Reduction of carbon dioxide to carbohydrates
O
Oxidation of carbon to carbon dioxide
O
Conversion of light energy to chemical energy
ANSWER: (c) Oxidation of carbon to carbon dioxide [Reduction
of carbon dioxide releases oxygen which is utilised for making
carbohydrates.]
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The opening and closing of the stomatal pore depends upon
O
Oxygen
O
Temperature
O
Water in guard cells
O
Concentration of CO2 in stomata
ANSWER: (c) Water in guard cells [Entry of water in guard cells
results in opening of stoma and reverse of it results in closing of
stomata.
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Choose the forms in which most plants absorb nitrogen
O
Proteins
O
Nitrates and Nitrites
O
Urea
O
Atmospheric nitrogen
 (1) and (2)
 (2) and (3)
 (3) and (4)
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(1) and (4)
ANSWER: (b) (2) and (3) [Protein is made by plants
by utilising nitrogen. Plants cannot take up
atmospheric nitrogen.]
Which is the first enzyme to mix with food in the digestive tract?
O Pepsin
Cellulase
Amylase
O
Trypsin
ANSWER: (c) Amylase [salivary amylase in salivain mouth is
the first enzyme to mix with food.]
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Which of the following statement(s) is (are) correct?
O
Pyruvate can be converted into ethanol and carbon dioxide by
yeast
O
Fermentation takes place in aerobic bacteria
O
Fermentation takes place in mitochondria
O
Fermentation is a form of anaerobic respiration
 (1) and (3)
 (2) and (4)
 (1) and (4)
 (2) and (3)
ANSWER: (c) 1 and (4) [Fermenation is a form of
anaerobic respiration whic takes place in cytoplasm and
liberates ethanol/lactic acid and carbon dioxide.]
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Lack of oxygen in muscles often leads to cramps among cricketers.
This results due to
O
Conversion of pyruvate to ethanol
O
Conversion of pyruvate to glucose
O
O
Non conversion of glucose to pyruvate
Conversion of pyruvate to lactic acid
ANSWER: (d) Conversion of pyruvate to lactic acid [Accumulation
of lactic acid in muscles results in muscle cramps.
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During deficiency of oxygen in tissues of human beings, pyruvic acid
is converted into lactic acid in the
O
Cytoplasm
O
Chloroplast
O
Mitochondria
O
Golgi body
ANSWER: (a) Cytoplasm ( it is an anaerobic process and it
occurs in cytoplasm.]