CBSE Questions for Class 12 Medical Biology Human Health And Disease Quiz 15 - MCQExams.com

Which nematode causes elephantiasis?
  • Ascaris
  • Wuchereria
  • Enterobius
  • Trichinella
Which of the following is not a typical character of phylum nematodes?
  • Syncytial epidermis
  • Pseudocoel
  • Nonliving cuticle
  • Gaseous exchange through gills
Which of the following is incorrectly matched?
  • Vaccines - Immunology
  • Eco-degradation - Pesticides
  • Solar energy converter - Pest control
  • Recombinant DNA - Biotechnology
Which of the followings is an autoimmune disease?
  • Haemophilia
  • AIDS
  • Myasthenia gravis
  • All of the above
Pseudocoelomic organism belong to________________________.
  • Annelids
  • Aschelminthes
  • Echinodermata
  • Amphibian
When body starts rejecting its own cells, it is called as
  • Immuno deficiency
  • Immunosuppression
  • Autografting
  • Autoimmunity
Cancer cells differ from non-cancerous cells, because
  • They have elevated levels of telomerase
  • Theya are virtually immortal
  • They have the ability to resist apoptosis
  • They can maintain the telomere length as they divide
How can male and female Ascaris be identified?
  • Posterior end of male is straight, while that of female is curved.
  • Anterior end of female is curved, while that of male is straight.
  • Posterior end of male is curved, while that of female is straight.
  • Anterior end of male is curved, while that of female is straight.
The pathogen Microsporum, responsible for ringworm disease in humans belongs to the same kingdom of organisms as that of ________.
  • Taenia, a tapeworm
  • Wuchereria, a filarial worm
  • Rhizopus, a mould
  • Ascaris, a roundworm
Which cell organelle plays an important role in detroxification of many poisons and drugs in a cell ?
  • mitochondria
  • vacuoles
  • Iysosomes
  • smooth endoplasmic reticulum
Consider the following statements (a-e) each with one or two blanks.

a. Lactobacillus promotes the curdling of milk by creating a ___(1)___ environment.
b. Vaccines employ the use of ___(2)___. They give protection against ___(3)___ diseases.
c. The ___(4)___ Anopheles mosquitoes are carriers of malaria and dengue is spread by ___(5)___ Aedes mosquito.
d. The crops that require more water for growth and are sown in the month of June are called ___(6)___ crops, while those that require less water for growth and are grown during the winter season are called ___(7)___ crops.
e. Manual scattering of seeds in the field is called ___(8)__.

Select the correct option to fill any four or five blanks.
  • (1) Acidic , (2) antibodies, (3) bacterial, (4) female
  • (1) Alkaline, (4) female, (5) male, (6) kharif, (7) rabi
  • (1) Acidic, (6) kharif, (7) rabi, (8) winnowing
  • (2) Weak germs, (4) female, (5) female, (6) kharif, (7) rabi
All of the following correctly characterise nematodes except that
  • They play an important role in decomposition.
  • They are often parasitic.
  • They have a pseudocoelom.
  • They have both circular and longitudinal muscles.
Select the wrong statements with regard to hormonal disorders.
  • The deficiency of thyroxine in children leads to physical and mental retardation and result cretinism.
  • Hyposecretion of aldosterone and cortisol results Addison's disease.
  • Elevated level of cortisol in the blood results in Cushing's syndrome.
  • Grave's disease is an autoimmune disorder results due to hypothyroidism.
The places of first, second and third moulting of Ascaris larva are
  • Soil, alveoli and lung
  • Liver, soil and stomach
  • Soil, lung and liver
  • Soil, intestine and lung
Round worms belongs to phylum 
  • Aschelminthes
  • Platyhelminthes
  • Echinodermata
  • Chordata
Ascaris lumbricoides is a common roundworm seen in
  • Large intestine
  • Small intestine
  • Liver
  • Stomach
The anterior V-spot in microfilaria of Wuchereria represents
  • Nerve ring
  • Cervical papilla
  • Excretory system
  • Reproductive
Which of the following statements are correct?
A. Polio vaccine is administered orally.
B. Most of the vaccines are taken intravenously.
C. Common cold is communicable and most easily infectious disease caused by viruses.
D. Vomiting, acute diarrhoea and muscular cramps are the symptoms of cholera.
  • A and B
  • A, C and D
  • A, B and D
  • All of the above
'Gonochorism' is a condition or a state of having just one of the two distinct sexes. Which of the following animals are gonochoristic or exhibit gonochorism?
  • Ascaris lumbricoides
  • Planaria
  • Fasciola
  • Taenia solium
Nocturnal periodicity is exhibited by
  • Yersinia
  • Ascarsis
  • Rhabditiform larva
  • Microfilaria
Which of the following cells is infected by the HIV virus?
  • Complement cells
  • Red blood cells
  • T-killer cells
  • T-helper cells
  • All of the above
Choose the correct order of events in a persons response to a bacterial infection
  • Macrophage ingestion $$\rightarrow$$ Helper T cell activation $$\rightarrow$$ B cell activation $$\rightarrow$$ clonal formation
  • Clonal formation $$\rightarrow$$ Helper T cell activation $$\rightarrow$$ B cell activation $$\rightarrow$$ macrophage ingestion
  • Macrophage ingestion $$\rightarrow$$ B cell activation $$\rightarrow$$ T helper cell activation $$\rightarrow$$ clonal formation
  • Helper T cell activation $$\rightarrow$$ B cell activation $$\rightarrow$$ macrophage ingestion $$\rightarrow$$ clonal formation
  • B cell activation $$\rightarrow$$ T helper cell activation $$\rightarrow$$ clonal formation $$\rightarrow$$ macrophage ingestion
Match the following.
  List - I  List - II
 A Entamoeba histolytica I Cytozoic parasite
 B Plasmoium II Coelozoic parasite
 C Wuchereria III Rhabditiform larva
 D Extra intestinal migration IV Monogenetic parasite
   V Lymphadenitis
  • A- IV, B- V, C- I, D- III
  • A- IV, B- I, C- V, D- III
  • A- V, B- I, C- II, D- III
  • A- IV, B- II, C- V, D- I
Identify the incorrect statement about the HIV virus.
  • The viral nucleotides contain ribose.
  • HIV contains uracil, not thymine.
  • HIV infection begins with the entrance of the virus into the host when the gp 120 and gp 41 function to pull the virus across the plasma membrane.
  • HIV makes the host cell produce reverse transcriptase.
  • Immunization against HIV has proven difficult because the virus mutates so rapidly.
Which one of the following life cycle stages of Wuchererio boncrofti is infective to man? 
  • Microfilaria
  • 1st stage larva
  • 2nd stage larva
  • 3rd stage larva
In the life cycle of Wuchereriae, 3rd and 4th moults of microfilaria take place in
  • Stomach a mosquito
  • Salivary glands of mosquito
  • Thoracic muscles of mosquito
  • Lymph vessels of man
Select the correct combination(s) from the followings.
  • Encephalitis -viral disease
  • Kala-azar - phlebotomus
  • Rhabditiform larvae - Ascaris
  • All of the above
Which two antibodies showed an ability recently to neutralise the virus of the epidemic of Middle-East Respiratory Syndrome(MERS)?
  • REGN$$3051$$
  • REGN$$3048$$
  • Both (a) and (b)
  • None of these
Taeniasis can be treated by 
  • Penicillin
  • Itraconazole
  • Praziquantel
  • Both A and B
A drug addict showed symptoms of increased appetite, chest pain, redness of eyes and increased urination. He was possibly taking 
  • Cannabis compounds.
  • LSD.
  • Cocaine.
  • Amphetamines.
Select the correct combination of statements regarding the disease, myasthenia gravis.
(i) It is an autoimmune disorder.
(ii) It causes insufficient acetylcholine binding that affects muscular contraction.
(iii) Antibodies are developed against acetylcholine.
(iv) Antibodies are developed against acetylcholine receptors.
(v) Antibodies are developed against acetylcholine esterase.
(vi) It causes drooping of eyelids.
  • (i), (iii), (iv), (vi)
  • (i), (iii), (v), (vi)
  • (i), (ii), (iv), (vi)
  • (ii), (iii), (iv), (v)
The posterior end of male roundworm (Ascaris) is:
  • Straight
  • Thickened
  • Circular
  • Curved
Animal group with pseudocoelom is:
  • Echinoderms
  • Molluscs
  • Aschelminthes
  • Annelids
The kind of coelom represented in the diagram is characteristic of
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  • Earthworm
  • Cockroach
  • Roundworm
  • Tapeworm
Which one is the group of bilaterally symmetrical and triploblastic animals?
  • Sponges
  • Coelenterates
  • Ctenophores
  • Aschelminthes
Animals with pseudocoelom is:
  • Amia/Leach
  • Lepisma/Liver Fluke
  • Dragon Fly/Jelly fish
  • Wuchereria/Hookworm/Roundworm
Thread worm or pinworm is
  • Ancylostoma duodenale
  • Necator americanus
  • Wuchereria bancrofti 
  • Enterobius vermicularis
Which statements are not correct?
a. Parapodia are lateral appendages in arthropods used for swimming.
b. Radula in molluscs is structure involved in excretion
c. Aschelminthes are dioecious
d. Echinoderm adults show radial symmetry 
e. Ctenophores are diploblastic.
  • a and b
  • a and c
  • a, d, and e
  • c and e
  • b, c and d
The body cavity of nemathelminthes is without peritoneal lining. It is
  • Haemocoel
  • True coelom
  • Pseudocoel
  • Atrium
Body cavity not lined by mesoderm and directly connected to archenteron occurs in
  • Platyhelminthes
  • Nematodes
  • Earthworm
  • Echinoderm
Female Dracunculus has
  • One copulatory spicule
  • One caudal spine
  • Two copulatory spicules
  • Both B and C
Amphids for olfacto-reception are present in Ascaris on
  • Pre-anal papilla
  • Post-anal papilla
  • Dorsal lip
  • Ventrolateral lips
Larvae of Ancylostoma feed on ___.
  • Bacteria
  • Protists
  • Organic debris
  • All of the above
Which of the following is unsegmented and ovoviviparous worm?
  • Ascaris
  • Wuchereria
  • Taenia
  • Fasciola
Male guinea worm has ?
  • Curved posterior end
  • Cloaca
  • Two copulatory spicules
  • All the above
Which of the following is the differentiating trait of Ascaris?
  • Sexual dimorphism and rhabditiform larva
  • Unisexual and digenetic parasite
  • Pseudocoelom and metameric segmentation
  • Hermaphrodite and pseudocoelom
Posterior end of male Enterobius possesses
  • One penial spicule
  • Two equal penial spicules
  • Two unequal penial spicules
  • None of the above
Elephantiasis/Filariasis is a disease of
  • Temperate areas
  • Tropical areas
  • Subtropical areas
  • Hilly tracts
Which of the following is true regarding male and female guinea worms?
  • Male is $$1/2-1/3$$ of female
  • Male is $$1/6-1/8$$ of female
  • Male is $$1/10-1/15$$ of female
  • Male is $$1/19-1/30$$ of female
Find out the correct sequence in body wall of Ascaris.
  • Cuticle, epidermis, longitudinal muscles and circular muscles.
  • Cuticle, epidermis and longitudinal muscles.
  • Epidermis, cuticle, longitudinal muscles and circular muscles.
  • Epidermis, longitudinal muscles, cuticle and circular muscles.
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Practice Class 12 Medical Biology Quiz Questions and Answers