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Latest UKSSSC Livestock Extension Officer Exam Question (Objective Questions), MCQ in English

Subjects : Biology

Question Bank UKSSSC Livestock Extension Officer Exam (Biology) - English
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Biology

Question 1Single Answer
The shivering, a characteristic symptom of malaria, occurs when :
  1. A
    sporozoites enter the blood
  2. B
    metacryptozoites are liberated from the liver cells
  3. C
    merozoites are liberated  from RBC with toxin
  4. D
    schizonts are formed in RBC     
Question 2Single Answer
The trophozoite of Plasmodium lives in :
  1. A
    erythrocytes of man
  2. B
    liver cells 
  3. C
    stomach of mosquito
  4. D
    blood of plasma   
Question 3Single Answer
In Paramecium, a food vacuole is formed at the posterior end of which structure?
  1. A
    Cytopharynx
  2. B
    Oral groove
  3. C
    Cytostome
  4. D
    Cytoproct
Question 4Single Answer
In a Paramecium, the trichocysts are used for :
  1. A
    fight or flight response
  2. B
    defence
  3. C
    offense
  4. D
    both (a) and (c) 
Question 5Single Answer
The disease caused by Trypanosoma cruzi is :
  1. A
    sleeping sicknees
  2. B
    chaga's disease
  3. C
    Kala-azar 
  4. D
    oriental sore  
Question 6Single Answer
The infective stage of Entamoeba histolytica is :
  1. A
    sporozoite
  2. B
    minuta form
  3. C
    mature cyst
  4. D
    trophic form  
Question 7Single Answer
Sporogony of malaria parasite occurs in :
  1. A
    liver of man
  2. B
    RBC of man
  3. C
    Stomach wall of mosquito
  4. D
    Salivary glands of mosquito   
Question 8Single Answer
Entamoeba differs from Amoeba is not having :
  1. A
    nucleus
  2. B
    pseudopodia
  3. C
    ectoplasm
  4. D
    contractile vascule  
Question 9Single Answer
Mild tertian malaria is caused by :
  1. A
    Plasmodium vivax
  2. B
    Plasmodium falciparum
  3. C
    Plasmodium ovale
  4. D
    Plasmodium malariae
Question 10Single Answer
Which adaptation enables Amoeba to survive unfavourable environmental conditions?
  1. A
    Binary fission
  2. B
    Conjugation
  3. C
    Encystment
  4. D
    Budding
Question 11Single Answer
Plant viruses usually contain :
  1. A
    RNA
  2. B
    DNA
  3. C
    DNA and RNA
  4. D
    DNA or RNA
Question 12Single Answer
Viruses were discovered by :
  1. A
    Stanley
  2. B
    Ivanowski
  3. C
    Twort
  4. D
    Herelle
Question 13Single Answer
Which statement best defines viruses?
  1. A
    Acellular infectious agents that replicate only inside living host cells
  2. B
    Cellular microorganisms containing only DNA
  3. C
    Free-living microorganisms capable of independent metabolism
  4. D
    Cellular microorganisms containing only RNA
Question 14Single Answer
Which infectious agents consist essentially of small, naked RNA molecules without a protein coat?
  1. A
    Virions
  2. B
    Prions
  3. C
    Viroids
  4. D
    Bacteriophages
Question 15Single Answer
Coliphage f X 174 contains :
  1. A
    double stranded RNA
  2. B
    single stranded DNA
  3. C
    double stranded DNA
  4. D
    single stranded RNA
Question 16Single Answer
Viruses differ from living organisms in that, they :
  1. A
    can grow inside a living host
  2. B
    can multiply inside a living host
  3. C
    can undergo mutation inside a living host
  4. D
    are non-cellular
Question 17Single Answer
Virus which attacks E.coli is called :
  1. A
    bacteriophage
  2. B
    coliphage
  3. C
    phytophage
  4. D
    zoophage
Question 18Single Answer
Which characteristic distinguishes viruses from cellular organisms?
  1. A
    They possess ribosomes for protein synthesis
  2. B
    They have independent energy metabolism
  3. C
    They are acellular and depend on host cells for replication
  4. D
    They reproduce by binary fission
Question 19Single Answer
The genome of a temperate bacteriophage integrated into the bacterial chromosome is termed as?
  1. A
    Prophage
  2. B
    Episome
  3. C
    Plasmid
  4. D
    Capsomere
Question 20Single Answer
Virus was crystallized and isolated first by :
  1. A
    J.D. Ivanowski
  2. B
    F.C. Bawden
  3. C
    W.M. Stanley
  4. D
    K.M. Smith
Question 21Single Answer
Little leaf disease of brinjal is primarily associated with which pathogen?
  1. A
    Phytoplasma
  2. B
    Begomovirus
  3. C
    Fungus
  4. D
    Viroid
Question 22Single Answer
Which approximate size range includes many of the smallest known conventional virus particles?
  1. A
    20–30 nm
  2. B
    100–150 nm
  3. C
    500–700 nm
  4. D
    1–2 µm
Question 23Single Answer
Which of the following is devoid of protein coat, with a constitution of RNA only ?
  1. A
    Tobacco mosaic virus
  2. B
    Poxvirus
  3. C
    Potato spindle tuber virus
  4. D
    None of the above
Question 24Single Answer
Genetic modification brought about by a virus in a bacteria is known as :
  1. A
    transformation
  2. B
    transduction
  3. C
    conjugation
  4. D
    candidiasis
Question 25Single Answer
Which property makes the classification of viruses as strictly living or non-living problematic?
  1. A
    They reproduce independently outside cells
  2. B
    They possess cellular organelles but lack DNA
  3. C
    They replicate in host cells but are metabolically inactive outside them
  4. D
    They perform independent respiration outside host cells
Question 26Single Answer
Influenza viruses contain which type of genetic material?
  1. A
    Double-stranded DNA
  2. B
    Single-stranded RNA
  3. C
    Single-stranded DNA
  4. D
    Double-stranded RNA
Question 27Single Answer
Edward Jenner is best known for pioneering vaccination against which disease?
  1. A
    Smallpox
  2. B
    Chickenpox
  3. C
    Rabies
  4. D
    Poliomyelitis
Question 28Single Answer
Roux Sarcoma virus contains :
  1. A
    RNA
  2. B
    DNA
  3. C
    DNA and RNA
  4. D
    None of these
Question 29Single Answer
Which of the following is a viral disease of potato ?
  1. A
    Early blight of potato
  2. B
    Late blight of potato
  3. C
    Leaf roll of potato
  4. D
    None of the above
Question 30Single Answer
The term Virus' has been derived from a Latin word meaning :
  1. A
    poison
  2. B
    secretion
  3. C
    cell
  4. D
    venom
Question 31Single Answer
What generally happens to contractile-vacuole activity when a freshwater Amoeba is transferred to a sufficiently hypertonic saline solution?
  1. A
    It increases rapidly
  2. B
    It remains unchanged
  3. C
    It decreases markedly or may cease
  4. D
    The vacuole divides repeatedly
Question 32Single Answer
What is the median adhesive pad located between the two terminal claws of a cockroach leg called?
  1. A
    Unguis
  2. B
    Arolium
  3. C
    Tibial spur
  4. D
    Cercus
Question 33Single Answer
The binomial system of Carolus Linnaeus was devoid of which of the following categories ?
  1. A
    Genus and species
  2. B
    Class and order
  3. C
    Phylum and family
  4. D
    Kingdom and class
Question 34Single Answer
The mouthparts of a cockroach are adapted primarily for which mode of feeding?
  1. A
    Biting and chewing
  2. B
    Piercing and sucking
  3. C
    Siphoning
  4. D
    Sponging
Question 35Single Answer
Which mosquito is the biological vector responsible for natural transmission of human malaria?
  1. A
    Male Culex
  2. B
    Female Culex
  3. C
    Female Aedes
  4. D
    Female Anopheles
Question 36Single Answer
Amniota group includes :
  1. A
    Aves and Reptiles
  2. B
    Pisces, Amphibia and Reptiles
  3. C
    Amphibia, Reptiles and Aves
  4. D
    Reptiles, Aves and Mammalia
Question 37Single Answer
Which combination correctly represents the principal mouthparts of a cockroach?
  1. A
    Labrum, mandibles, first maxillae, labium and hypopharynx
  2. B
    Labrum, antennae, tibia, labium and cerci
  3. C
    Mandibles, antennae, femur, maxillae and labium
  4. D
    Labrum, wings, mandibles, hypopharynx and tibia
Question 38Single Answer
In a typical winged insect, the two pairs of wings are borne on which thoracic segments?
  1. A
    Prothorax and mesothorax
  2. B
    Mesothorax and metathorax
  3. C
    Prothorax and metathorax
  4. D
    Prothorax and first abdominal segment
Question 39Single Answer
Which is true ?
  1. A
    Pisces, Reptiles and birds are poikilotherms
  2. B
    Pisces, Amphibians and Reptiles are Anamniota
  3. C
    Aves, Mammals and Reptiles are homeotherms
  4. D
    Reptiles, Aves and Mammais are Amniota
Question 40Single Answer
Which sequence correctly represents the general forward flow of haemolymph through the dorsal vessel of a cockroach?
  1. A
    Pericardial sinus → heart → aorta → head → haemocoelic sinuses
  2. B
    Heart → pericardial sinus → aorta → head → dorsal sinus
  3. C
    Ventral sinus → aorta → heart → head → dorsal sinus
  4. D
    Head → aorta → heart → pericardial sinus → ventral sinus
Question 41Single Answer
What are the dorsal sclerites of the three thoracic segments of an insect collectively called?
  1. A
    Sterna
  2. B
    Pleura
  3. C
    Nota
  4. D
    Coxae
Question 42Single Answer
Amniotes do not include :
  1. A
    Amphibia
  2. B
    Reptiles
  3. C
    Birds
  4. D
    Mammals
Question 43Single Answer
Which vector transmits visceral leishmaniasis or kala-azar?
  1. A
    Glossina
  2. B
    Aedes
  3. C
    Pediculus
  4. D
    Phlebotomus
Question 44Single Answer
What are the corpora allata of a cockroach?
  1. A
    Excretory organs
  2. B
    Tactile organs
  3. C
    Endocrine glands
  4. D
    Digestive glands
Question 45Single Answer
The group amniota includes :
  1. A
    Reptiles and birds
  2. B
    Reptiles and mammals
  3. C
    Reptiles, birds and mammals
  4. D
    Birds and mammals
Question 46Single Answer
Which type of chemical bond is primarily responsible for the high boiling point of water in biological systems?
  1. A
    Covalent bond
  2. B
    Ionic bond
  3. C
    Hydrogen bond
  4. D
    Van der Waals bond
Question 47Single Answer
The bond dissociation energy of a C-H bond in methane is higher than that of a C-C bond in ethane due to:
  1. A
    Higher electronegativity of hydrogen
  2. B
    Shorter bond length of C-H
  3. C
    Stronger Van der Waals forces
  4. D
    Greater ionic character
Question 48Single Answer
In a peptide bond, the partial double-bond character arises due to:
  1. A
    Hydrogen bonding with water
  2. B
    Resonance between C=O and C-N bonds
  3. C
    Hydrophobic interactions
  4. D
    Electrostatic repulsion
Question 49Single Answer
Which interaction is least commonly involved in stabilizing the tertiary structure of a typical protein?
  1. A
    Disulfide bond
  2. B
    Coordinate covalent bond
  3. C
    Hydrogen bond
  4. D
    Hydrophobic interaction
Question 50Single Answer
The molecular geometry of a water molecule is bent due to:
  1. A
    sp hybridization of oxygen
  2. B
    Triple bond formation
  3. C
    Lone pair repulsion on oxygen
  4. D
    Ionic interactions
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