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Medical
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Which of the following characteristic features always holds true for the corresponding group of animals?

  • Option 1)

    Cartilaginous endoskeleton

    Chondrichthyes

     

  • Option 2)

    Viviparous

    Mammalia

     

  • Option 3)

    Possess a mouth with an upper and a lower jaw

    Chordata

     

  • Option 4)

    3-chambered heart with one incompletely divided ventricle

    Reptilia

     

 
  Heart in reptilia - Usually 3-chambered but four chambered in crocodiles. -    Reptiles have 3-chambered heart except for crocodiles.  Mammals are viviparous except prototherian mammals. Option 1) Cartilaginous endoskeleton Chondrichthyes   Correct Option 2) Viviparous Mammalia   Incorrect Option 3) Possess a mouth with an upper and a lower jaw Chordata   Option...
Medical
444 Views   |  

Which one of the following statements is wrong?

  • Option 1)

    Cyanobacteria are also called blue-green algae.

  • Option 2)

    Golden algae are also called desmids.

  • Option 3)

    Eubacteria are also called false bacteria.

  • Option 4)

    Phycomycetes are also called algal fungi.

 
As learnt Major Group of Monera - Archaebacteria ( Ancient bacteria) Eubacteria (True Bacteria ) -     Eubacteria are called true bacteria. Option 1) Cyanobacteria are also called blue-green algae. This option is incorrect Option 2) Golden algae are also called desmids. This option is incorrect Option 3) Eubacteria are also called false bacteria. This option is correct Option...
Medical
380 Views   |  

Which one of the following characteristics is not shared by birds and mammals?

  • Option 1)

    Ossified endoskeleton

  • Option 2)

    Breathing using lungs

  • Option 3)

    Viviparity

  • Option 4)

    Warm blooded nature

 
As learnt Class Aves (Birds) - Characterised by the presence of feathers and most of them can fly. They posses beak and forelimbs are modified into wings. - wherein Eg. Corvus, columba, Psittacula, Struthio, Pavo.    AND   Class Mammalia - Unique characteristic is presence of mammary glands. Two pairs of limbs and external ears or pinnae present. -     Birds are oviparous while mammals are...
Medical
191 Views   |  

Which of the following features is not present in the Phylum - Arthropoda?

  • Option 1)

    Chitinous exoskeleton

  • Option 2)

    Metameric segmentation

  • Option 3)

    Parapodia

  • Option 4)

    Jointed appendages

 
As learnt Locomotion in annelida - By setae or parapodia or through muscle fibres. -    Parapodia is a characteristic of Annelida. Option 1) Chitinous exoskeleton This option is incorrect Option 2) Metameric segmentation This option is incorrect Option 3) Parapodia This option is correct Option 4) Jointed appendages This option is incorrect
Medical
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The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the:

  • Option 1)

    Halophiles

  • Option 2)

    Thermoacidophiles

  • Option 3)

    Methanogens

  • Option 4)

    Eubacteria

 
As learnt in Methanogens - Autotrophs Obligate anaerobes Gram negative bacteria Produce methane gas from CO2 or formic acid Lives in digestive tracks of grazing animals and rotten selvage. - wherein Eg.     Methane coccus             Methanebacterium     Option 1) Halophiles This option is incorrect Option 2) Thermoacidophiles This option is incorrect Option 3) Methanogens This option is...
Medical
161 Views   |  

Select the correct statement:

  • Option 1)

    Gymnosperms are both homosporous and heterosporous

  • Option 2)

    Salvinia, Ginkgo and Pinus all are gymnosperms

  • Option 3)

    Sequoia is one of the tallest trees

  • Option 4)

    The leaves of gymnosperms are not well adapted to extremes of climate

 
As learnt Largest Gymnosperm - Sequoia dendron -     Option 1) Gymnosperms are both homosporous and heterosporous This option is incorrect Option 2) Salvinia, Ginkgo and Pinus all are gymnosperms This option is incorrect Option 3) Sequoia is one of the tallest trees This option is correct Option 4) The leaves of gymnosperms are not well adapted to extremes of climate This option is incorrect
Medical
868 Views   |  

One of the major components of cell wall of most fungi is :

  • Option 1)

    Chitin

  • Option 2)

    Peptidoglycan

  • Option 3)

    Cellulose

  • Option 4)

    Hemicellulose

 
  Characteristics of fungi - Eukaryotic and multicellular  Non -photosynthetic and heterotrophic Cell wall composed of chitin and polysaccharides Stored food - Glycogen Fungal body made up of hypae , which aggregate to form mycelia. They are saprotrophic , parasitic or symbionts.  -     Option 1) Chitin Option is correct Option 2) Peptidoglycan Option is incorrect Option 3) Cellulose Option...
Medical
501 Views   |  

Nomenclature is governed by certain universal rules.

Which one of the following is contrary to the rules of nomenclature?

  • Option 1)

    Biological names can be written in any language

  • Option 2)

    The first word in a biological name represents the genus name, and the second is a specific epithet

  • Option 3)

    The names are written in Latin and are italicised

  • Option 4)

    When written by hand, the names are to be underlined

 
  Nomenclature - Science of providing distinct and proper names to an organism. - wherein There is a need to standardize the naming of an organism, so that it is known by same name across the world.      Option 1) Biological names can be written in any language Option is correct Option 2) The first word in a biological name represents the genus name, and the second is a specific...
Medical
366 Views   |  

Chrysophytes, Euglenoids, Dinoflagellates and Slime moulds are included in the kingdom:

  • Option 1)

    Monera

  • Option 2)

    Protista

  • Option 3)

    Fungi

  • Option 4)

    Animalia

 
  Kingdom Protista - Unicellular eukaryotic. Mostly aquatic. Well define nucleus present Various membrane bound organelles present Flagella and cilia, if present have (9+2) pattern of micro tubular stands. Reproduction is asexual and sexual. Autotrophic, parasitic and heterotrophic. - wherein Classified into three type Photosynthetic protists Consumer decomposer protists Protozoan....
Medical
201 Views   |  

Which of the following statements is wrong for viroids?

  • Option 1)

    They lack a protein coat

  • Option 2)

    They are smaller than viruses

  • Option 3)

    They cause infections

  • Option 4)

    Their RNA is of high molecular weight

 

Option four is wrong Their RNA I SPF lower MW than virus

Medical
178 Views   |  

In bryophytes and pteridophytes, transport of male gametes requires:

  • Option 1)

    Wind

  • Option 2)

    Insects

  • Option 3)

    Birds

  • Option 4)

    Water

 
    Characteristics of bryophyta - Main plant body is gametophytic and thalloid which is not differentiated into root, stem and leaves.Sporophyte is parasitic over gametophytic. Antheridium and archegonium present. -     In some primitive plants like pteridophytes and bryophytes water is the medium through which the male gametes are transferred to the female reproductive organ for...
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