Answers and bookmarks are saved in this browser, across visits. They do not sync to your account.
300 questions in this collection · Page 1 of 30
Question 1 of 300
📘 CLASS XI
Biological Classification
Which of the following was NOT a criterion used by R.H. Whittaker for his Five Kingdom Classification?
R.H. Whittaker (1969) used cell structure, body organisation, mode of nutrition, reproduction and phylogenetic relationships as the major criteria for classification. Mode of respiration was not one of the criteria.
Question 2 of 300
📘 CLASS XI
Biological Classification
The Two Kingdom system of classification proposed by Linnaeus was considered inadequate because it failed to distinguish between:
The Two Kingdom system did not distinguish between prokaryotes and eukaryotes, unicellular and multicellular organisms, or photosynthetic organisms and fungi.
Question 3 of 300
📘 CLASS XI
Biological Classification
Which of the following statements about Mycoplasma is correct?
Mycoplasma lack a cell wall, are the smallest known living cells and can survive without oxygen.
Question 4 of 300
📘 CLASS XI
Biological Classification
Methanogens, which are responsible for producing biogas from the dung of ruminants, belong to which group of organisms?
Methanogens are archaebacteria found in marshy areas and in the gut of ruminants. They produce methane used as biogas.
Question 5 of 300
📘 CLASS XI
Biological Classification
In some cyanobacteria, specialised cells are present that help in fixing atmospheric nitrogen. These cells are called:
Heterocysts are specialised nitrogen-fixing cells found in cyanobacteria such as Nostoc and Anabaena.
Question 6 of 300
📘 CLASS XI
Biological Classification
The indestructible nature of diatom cell walls is due to the presence of:
Diatom cell walls are impregnated with silica, making them highly resistant and leading to the formation of diatomaceous earth.
Question 7 of 300
📘 CLASS XI
Biological Classification
Which group of protists lacks a cell wall and instead has a protein-rich layer that makes their body flexible?
Euglenoids possess a protein-rich pellicle instead of a cell wall, making their body flexible.
Question 8 of 300
📘 CLASS XI
Biological Classification
Red tides in marine environments are frequently caused by the rapid multiplication of:
The red dinoflagellate Gonyaulax multiplies rapidly to produce red tides and releases toxins harmful to marine animals.
Question 9 of 300
📘 CLASS XI
Biological Classification
Under suitable environmental conditions, slime moulds form an aggregation known as:
Slime moulds aggregate into a multinucleate plasmodium under favourable conditions and later form fruiting bodies.
Question 10 of 300
📘 CLASS XI
Biological Classification
The cell walls of organisms in the Kingdom Fungi are primarily composed of:
Fungal cell walls are made mainly of chitin and polysaccharides, unlike plant cell walls which contain cellulose.