Biological Classification

More Topic from Biology

Question 1

A genetically engineered micro-organism use successfully in bioremediation of oil spills is a species of

  • Pseudomonas

  • Trichoderma

  • Xanthomonas

  • Bacillus

Solution

A.

Pseudomonas

Genetically engineered micro-organism called Pseudomonas putida is used in bioremediation of oil spills. It is also known as 'Chakarborty's super bug.

Question 2

An example of endomycorrhiza is 

  • Nostoc

  • Glomus

  • Agaricus

  • Rhizobium

Solution

B.

Glomus

Nostoc is a blue-green algae capable of fixing nitrogen. 
Glomus is associated with endomycorrhiza.
Agaricus or mushroom is an edible fungus of class-Basidiomycetes.
Rhizobium is a symbiotic nitrogen -fixing bacterium found in the root nodules of leguminous plants.

Question 3

Archaebacteria differ from eubacteria in

  • cell membrane structure

  • mode of nutrition

  • cell shape

  • mode of reproduction

Solution

A.

cell membrane structure

Archeabacteria different from eubacteria in that eubacteria has two cell membrane composed mainly of glycerol - ester lipids, while archaebacteria have a membrane made up of glycerol - ether lipid. Ether lipids are chemically more resistant then ester lipids. This stability help archaebacteria survive at high temperature and in very acidic or alkaline environment. 

Question 4

Besides paddy fields, cyanobacteria are also found inside vegetative part of

  • Pinus

  • Cycas

  • Equisetum

  • Psilotum

Solution

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 gymnosperm.Equisetum belongs to vascular plants and to horse tail family.Psilotum belongs to division -Pteridophyta and is a fern like a plant.

Question 5

Choose the wrong statement

  • Penicillium is multicellular and produces antibiotics

  • Neurospora is used in the study of biochemical genetics

  • Morels and truffles are poisonous mushrooms

  • Yeast is unicellular and useful in fermentation. 

Solution

C.

Morels and truffles are poisonous mushrooms

All statements are correct, except statement (c), which can be corrected as
Morels and truffles are edible and members of Ascomycetes in fungi.