Besides paddy fields, cyanobacteria are also found inside vegetative part of
Pinus
Cycas
Equisetum
Psilotum
B.
Cycas
Cyanobacteria within the coralloid roots of Cycas are chemoheterotrophic and specifically adapted to life in symbiosis. Only a few species of cyanobacteria form associations with Cycas.
Pinus is a gymnosperm.
Equisetum belongs to vascular plants and to horse tail family.
Psilotum belongs to division- Pteridophyta and is a fern like plant.
Which one of the following cocci appears like grapes under microscope?
Streptococci
Diplococci
Staphylococci
Pneumococci
Pigment-containing memberanous extensions in some cyanobacteria are
heterocysts
basal bodies
pneumatophores
chromatophores
Which of the following statements is/are correct for transduction?
It is observed in Gram positive and Gram negative bacteria.
Bacteria should be in state of competence
Transfer of DNA by a bacteriophage takes place.
Packaging of both host and phage DNA takes place
Which of the following are likely to be present in deep sea water?
Archaebacteria
Eubacteria
Blue-green algae
Saprophytic fungi
Which of the following bacteria is observed as chain-like formation?
Escherichia coli
Bacillus subtilis
Streptococcus pyogenes
Micrococcus flavus
Study the following Coloumns and match correctly.
| Column I | Column II |
| A. Siphonogamy and zooidogamy | 1. Amphibians of plant kingdom |
| B. Living fossil | 2. Arachis |
| C. Liverworts | 3. Ginkgo |
| D. Double fertilisation |
4. Cycas 5. Laminaria |
The correct answer is
A - 4; B - 5; C - 2; D - 1
A - 2; B - 4; C - 1; D - 3
A - 4; B - 3; C - 2; D - 1
A - 4; B - 3; C - 1; D - 2
The metrics described by whittaker which takes into account the number of species and their eveness is
Shannon index
Beta diversity
Species richness
Simpson index
The heterocysts in the cyanobacterium are
site of photosynthesis
reserve food storage
enactive enzymes
nitrogen-fixation
Which of these components is/are not present in Gram negative bacteria?
Teichoic acid
Pseudomurein
Lipopolysaccharide
Mycolic acid
