Digestive System and Gaseous Exchange, Biology MDCAT Unit 1
BIOLOGY MDCAT series for UHS TOPIC WISE TEST (UNIT–1) covers TOPICS of DIGESTIVE SYSTEM and GASEOUS EXCHANGE.
Q.1 Energy is obtained from food in process of:
A) Assimilation
B) Decomposition
C) Digestion
D) Cellular respiration
Q.2
It is a sac like structure in human alimentary canal:
A) Stomach
B) Duodenum
C) Appendix
D) Colon
Q.3
A
function of buccal cavity that is aided by sense of sight, smell and taste is:
A)
Selection
B)
Mastication
C)
Lubrication
D)
Digestion
Q.4
All of the following are functions of stomach
in humans except:
A) Temporary food storage
B) Mechanical
break down of food
C) Digestion
of proteins
D) Fermentation by microorganisms
Q.5
What is dissimilar between trypsin and pepsin?
A) Trypsin works in basic medium but pepsin in
acidic medium
B) Pepsin works in aqueous medium but trypsin may
act in any medium
C) Pepsin digest proteins but trypsin acts on amino
acids
D) Pepsin acts in stomach but trypsin in pancreas
Q.6
Which of the following is probably not an
action of symbiotic microorganisms of mammalian gut?
A) Digestion of cellulose
B) Vitamin K
production
C) Digestion
of proteins
D) Vitamin B12 production
Q.7
An infant may be feeding entirely on mother’s
milk but color of his stools is quite yellow due to:
A) Undigested milk protein casein
B) Pancreatic
juice poured into duodenum
C) Intestinal
juices
D) Bile pigments passed through bile juice
Q.8
Fats are richly found in:
A) Lymph glands
B) Alveolar
tissues
C) Adipose
tissues
D) Liver cells
Q.9
Functions of the
tongue include all, EXPECT:
A) Mixing
B) Lubrication
C) Hydrolysis
D) Swallowing
Q.10 It is true about hunger pangs:
A) Start due to high blood
glucose level
B) Start after eating a low calories diet
C) Are waves for mechanical digestion
D) Are peristaltic
contractions
Q.11
Soft
palate prevents entry of food in:
A)
Buccal cavity
B)
Nasal cavity
C)
Oesophagus
D)
Trachea
Q.12
Following parts of
digestive system are involved in both mechanical as well as chemical digestion:
A) Buccal cavity and
esophagus
B) Buccal
cavity, esophagus and small intestine
C) Buccal cavity and large
intestine
D) Buccal cavity and
stomach
Q.13
Heartburn (Pyrosis) is due to incompetence
of:
A) Cardiac sphincter
B) Ileocolic sphincter
C) Pyloric sphincter
D) Anal sphincter
Q.14
Organ where maximum types of
enzymes act for digestion of food:
A)
Esophagus
B)
Small intestine
C)
Stomach
D)
Pharynx
Q.15
Chief cells of
stomach produce:
A)
HCl
B)
Gastrin
C) Mucus
D)
Pepsinogen
Q.16
The muscles of the stomach walls thoroughly
mix up the food with gastric juices and the resultant semi-solid/ semi-liquid
material is called:
A) Bolus
B) Mucus
C) Chyle
D) Chyme
Q.17
Which of the following is not digested in
human digestive system?
A) Proteins
B) Triglycerides
C) Starch
D) Vitamins
Q.18
Surface area for absorption of food in ileum
is mainly increased by:
A) Intestinal folds
B) Microvilli
C) Villi
D) Lacteal
Q.19
Many
humans develop intestinal gas after consuming milk because they lack:
A) Lactose
B) Maltase
C) Lactase
D) Renin
Q.20
Secretin
is a hormone released into the blood from mucosa of:
A) Oesophagus
B) Duodenum
C) Stomach
D) Jejunum
Q.21
Lactase and lipase
in small intestine are secreted by:
A)
Goblet cells
B)
Endocrine cells
C)
Intestinal mucosa
D)
Pancreatic ducts
Q.22
Arrange the
segments of the colon in the sequence through which undigested material passes
prior to defecation:
(1) Rectum
(2)
Transverse colon
(3) Descending colon
(4)
Ascending colon
A)
4, 3, 2, 1
B)
2, 1, 3, 4
C)
1, 2, 3, 4
D)
4, 2, 3, 1
Q.23
Digestion
occurs in all of the following parts of human alimentary canal, EXCEPT:
A) Buccal cavity
B) Small intestine
C) Stomach
D) Large intestine
Q.24
Slimy
liquid which serves to moisten and lubricate the food in buccal cavity is
mainly made of:
A)
Water & Mucus
B)
Water & NaHCO3
C)
Mucus & Amylase
D) NaHCO3 & Mucus
Q.25
Total canines in our oral cavity are:
A) 2
B) 6
C) 4
D) 8
Q.26
Starch is converted to maltose by the action
of:
A) Sucrase
B) Lactase
C) Maltase
D) Amylase
Q.27 Tongue is involved in all of the following except:
A)
Selection
B) Mixing
C) Mastication
D)
Swallowing
Q.28
Food poisoning can induce:
A) Peristalsis
B) Antiperistalsis
C) Constipation
D) Hunger pangs
Q.29 It is not true for bile:
A) Green watery fluid
B) Stored in gall bladder
C) Produced by liver
D) Causes chemical digestion
Q.30 Q.30 Bacteria that produce vitamin K in our intestine are present in:
A) Colon
B) Caecum
C) Anus
D) Ileum
Q.31 Q.31 Less absorption of water in large intestine leads to:
A) Diarrhoea
B) Constipation
C) Defecation
D) Urination
Q.32
The exchange of gases in alveoli of human
lungs occurs by:
A) Active transport
B) Simple diffusion
C) Passive transport
D) Facilitated diffusion
Q.33
Respiratory system develops from:
A) Ectoderm
B) Endoderm
C) Mesoderm
D) Epiblast
Q.34
Blood reaching to tissues via arteries has:
A) Higher PO2
B) Greater bicarbonates
C) Higher
PCO2
D) Lower pH
Q.35
Which type of cartilage is mostly found in
respiratory passage ways:
A) Hyaline cartilage
B) Elastic cartilage
C) Fibro
cartilage
D) All A, B, C
Q.36
Voice producing organ in
humans is _____but speech production is function of_____:
A) Larynx, Nasal cavities
B) Larynx, Tongue and lips
C) Larynx, Pharynx
D) Pharynx, Tongue and lips
Q.37
The chemical nature
of surfactant is:
A)
Glycoprotein
B)
Lipopolysaccharides
C)
Pure protein
D)
Lipoprotein
Q.38
During swallowing,
glottis is:
A)
Completely closed
B)
Completely open
C)
Partly closed
D)
Horizontal in position
Q.39
Cartilages are
completely absent in:
A)
Bronchi
B)
Trachea
C)
Wind pipe
D)
Bronchioles
Q.40
Gaseous exchange is also called as:
A) Cellular respiration
B) Organismic
respiration
C) Tissue respiration
D) Aerobic respiration
Q.41
Voice is produced during:
A) Coughing
B) Inspiration
C) Expiration
D) Breathing
Q.42
All of the following functions are performed
by nasal cavities, EXCEPT:
A) Moistening the air
B) Warming the air
C) Filtration of bacteria from air
D) Filtration of dust
particles
Q.43
An oxygen molecule has
to cross _______ lipid bilayers to reach Hemoglobin from alveoli:
A) 3
B) 2
C) 4
D) 5
Q.44
During
inspiration:
A) Diaphragm contracts,
intercostal muscles relax, rib cage elevated
B) Diaphragm contracts, intercostal muscles
relax, rib cage lowered
C) Diaphragm contracts, intercostal muscles
contract, rib cage elevated
D) Diaphragm relaxes, intercostal
muscles relax, Rib cage elevated
Q.45
What happens when
pH of blood is increased?
A)
The delivery of oxygen to tissues is increased
B)
More O2 binds to Hemoglobin
C)
Hemoglobin is denatured
D)
O2 binding remains unaffected
Q.46
CO2
carried by corpuscles is combined with:
A)
Na+
B)
Ca+
C)
K+
D)
Mg+
Q.47
CO 2 is commonly transferred
through blood:
A) In form of HCO-3
B) Being
dissolved in plasma
C) In form of carbaminohemoglobin
D) Bound with K+
Q.48
Division of trachea forms:
A) Bronchi
B) Trachioles
C) Bronchioles
D) Air sacs
Q.49 Q.49 Carbonic acid is formed from CO2 and H2O in:
A)
Tissues
B) RBCs
C) Plasma
D)
Lungs
Q.50 Q.50 All arteries contain 50ml of CO2/100ml of blood, EXCEPT:
A)
Renal artery
B) Bronchial artery
C) Hepatic artery
D)
Pulmonary artery
Q.51
Myoglobin transfers oxygen from:
A) Alveoli to RBC
B) Plasma to muscle cell
C) Haemoglobin to plasma
D) Haemoglobin to muscle cell
Q.52
Human lungs are not:
A) Major part of pulmonary
circulation
B) Organs involved in acid base balance
C) Largest organs in human body
D) Organs involved in
homeostasis
Q.53
Which of the following is functional unit of
lungs:
A) Alveolar sac
B) Alveoli
C) Air
sac
D) Bronchiole
Q.54 Q.54 Surfactant is produced by:
A)
Alveolar ducts
B)
Alveolar epithelium
C)
Bronchial cells
D)
Capillary endothelium
Q.55 Q.55 What is the role of cilia in the gaseous exchange system?
A)
They increase surface area for absorption
B)
They move mucus up the trachea
C)
They
move air down the trachea
D)
They trap dust and bacteria
Q.56
If you exhale to your
full capacity, how much air would be still available in your lungs?
A)
500 ml
B) 1.5 liters
C) 3.5
Liters
D) 5 liters
Q.57
Majority of oxygen in human body is
transported by?
A)
Lymph
B) Blood cells
C) Plasma
D)
Plasma proteins
Q.58
The external feature/structure of a human
nose depends upon the cartilage and:
A) Sphenoid bone
B) Paired facial bone
C) Zygomatic
bone
D) Unpaired facial bone
Q.59
Pick the one that does not describe the
function of pleura:
A) Encases and protects the
lungs
B) Stops
leaking of air into thoracic cavity
C) Reduces
friction between lungs and thorax
D) Protects the lungs from
pathogens
Q.60
Which of the following gas makes most stable
product with haemoglobin?
A) CO
B) CO2
C) O2
D) N2
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