Given below is the diagram of a bacteriophage. In which one of the options all the four parts A, B, C and D are correct –

Options
       A              B             C           D

  •   Sheath     Collar        Head     Tail fibres
  •    Head       Sheath      Collar     Tail fibres
  •    Collar      Tail fibres   Head      Sheath
  •   Tail fibres   Head        Sheath     Collar

Match plant diseases given in Column I with causative pathogens in Column II and select the correct match from the codes given:
COLUMN I COLUMN II
A Brown rust of wheat P Colletotrichum falcatum
B Black rot of crucifers Q Xanthomonas campestris
C Red rot of sugarcane R Phytophthora infestans
D Late blight of potato S Puccinia graminis

Codes:
A B C D
1. S Q P R
2. S Q R P
3. S R P Q
4. R Q R S
  • 1
  • 2
  • 3
  • 4
Regarding bacteria:
 
  • The rod shaped are called as coccus
  • Majority are photosynthetic autotrophs
  • As a group show the maximum metabolic diversity
  • All are pathogenic to humans
Both Mycoplasma and Euglenoids:
 
  • can survive without oxygen
  • are unicellular eukaryotes
  • lack cell wall
  • have two flagella
In members of Basidiomycetes:
 
  • Mycelium is unbranched and coenocytic
  • Sex organs are absent and plasmogamy does not take place
  • Asexual spores are not found but vegetative reproduction by fragmentation is common
  • Basidiospores are produced endogenously on the basidium
Organisms that are highly valuable in learning about phloem transport are:
  • Aphids
  • Humming birds
  • Leaf miners
  • Caterpillars
Match each item in Column I with one in Column II and select the correct match from the codes given:
Group of protozoans Example
A Amoeboid P Entamoeba
B Flagellated Q Paramecium
C Ciliated R Trypanosoma
D Sporozoan S Plasmodium

Codes:
A B C D
1. Q S P R
2. S Q R P
3. P R Q S
4. R P S Q

 
  • 1
  • 2
  • 3
  • 4
Identify the incorrect statement regarding heterotrophic bacteria?
  • They are most abundant bacteria in nature
  • Many of them are important decomposers
  • They play a great role in recycling nutrients like nitrogen, phosphorus, iron and sulphur
  • They are helpful in making curd from milk, production of antibiotics, fixing nitrogen in legume roots, etc.
An intervening dikaryophase is seen during the sexual reproduction in members of the fungal class:
  • Phycomycetes and Ascomycetes
  • Ascomycytes and Basidiomycetes
  • Basidiomycetes and Deuteromycetes
  • Phycomycetes and Deuteromycetes
Abnormally folded infectious proteins can, in humans, cause:
 
  • Mad cow disease
  • Scrapie
  • Creutzfeldt-Jacob disease
  • MERS
Methanogens, present in the gut of several ruminants, are:
  • Archaebacteria
  • Photosynthetic autotrophic bacteria
  • Chemoheterotroph eubacteria
  • Chemosynthetic eubacteria
Hyphae, that are continuous tubes filled with multinucleated cytoplasm, are seen in the members of:
  • Ascomycetes
  • Phycomycetes
  • Deuteromycetes
  • Basidiomycetes
Viruses:
  • contain both DNA and RNA as genetic material
  • are facultative parasites
  • cannot be crystallized
  • are nucleoproteins
Generally, the shape not seen in a bacterial cell is:
  • Rod like
  • Comma shaped
  • Spherical
  • Icosahedral
All the following statements regarding diatoms are true except:
  • The two overlapping shells of cell wall fit together as in a soap box.
  • They are the chief ‘producers’ in the oceans.
  • Their cell walls are embedded with silica.
  • Diatoms behave like heterotrophs when deprived of sunlight.
Kingdom Protista has brought together Chlamydomonas, Chlorella with Paramoecium and Amoeba. On what basis were these organisms separated under previous classification systems?
  • Cell wall
  • Cell type
  • Body organisation
  • Mode of nutrition
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