CHAPTER-2 : BIOLOGICAL CLASSIFICATION
Multiple Choice Questions
- How is a capsule advantageous to a bacterium?
(a) It protects the bacterium from desiccation.
(b) It provides means of locomotion.
(c) It allows bacterium to “hide” from host’s immune system.
(d) Both (a) and (c)
- The sporozoa are all internal that typically have an
infective cyst stage in their life cycle. An example of sporozoa
is the Genus , which causes malaria.
(a) ciliates, Plasmodium
(b) flagellates, Plasmodium
(c) parasites, Plasmodium
(d) parasites, Trypanosoma
- Identify the parts labelled as A and B in
the given figure of a blue green alga.
(a) A-Vegetative cell, B-Heterocyst
(b) A-Somatic cell, B-Gamete
(c) A-Mucilaginous sheath, B-Heterocyst
(d) A-Heterocyst, B-Mucilaginous sheath
- The chief component of bacterial cell wall is
(a) cellulose and chitin
(b) cellulose and pectin
(c) peptidoglycans
(d) cellulose and carbohydrates.
- Which of the following statements is incorrect?
(a) Pathogenic bacteria cause 90% of human diseases.
(b) A large number of antibiotics are produced by
Actinomycetes (e.g., Streptomyces), which is a Class
of Fungi.
(c) N 2 -fixing bacteria pick up free N 2 from soil atmosphere
and convert it into nitrogenous compounds.
(d) Archaebacteria differ from other bacteria in having
a different cell wall structure and this feature is
responsible for their survival in extreme conditions.
- Dikaryon formation is characteristic of
(a) ascomycetes and basidiomycetes
(b) phycomycetes and basidiomycetes
(c) ascomycetes and phycomycetes
(d) phycomycetes and zygomycetes.
- Read the given statements.
A. Artificial system studies homology in characters viz.
morphology, anatomy, molecular systematics, etc.
B. Natural system gives information about both natural
relationships and phylogeny.
C. Natural system uses habit and habitat as criteria for
classification.
D. Artificial system often results in placing of unrelated
organisms in a group.
Of the above statements,
(a) A and B are correct, C and D are incorrect
(b) B and D are correct, A and C are incorrect
(c) A, B and D are correct, C is incorrect
(d) A, B and C are correct, D is incorrect.
- Select the mismatched pair.
Virus Size
(a) Alfalfa Mosaic Virus - 50 nm
(b) Parrot fever Virus - 400 nm
(c) Beet yellow Virus - 1250 × 40 nm
(d) TMV - 300 × 17.5 nm
- Which of the following statements regarding the Class
Phycomycetes is correct?
(a) These are found in aquatic habitats and on decaying
wood in moist and damp places or as obligate
parasites on plants.
(b) Mycelium in these fungi is aseptate and coenocytic.
(c) Asexual reproduction occurs by motile zoospores or
by non-motile aplanospores.
(d) All of these
- Which of the following is an example of amoeboid
protozoan?
(a) Trypanosoma (b) Paramecium
(c) Plasmodium (d) Entamoeba
- Identify the given figure X and select the correct option.
(a) X is Entamoeba histolytica which capture
X
its prey by putting out pseudopodia.
(b) X is Plasmodium vivax that causes malaria
which has a staggering effect on humans.
(c) X is Giardia intestinalis that causes a
disease known as chagas disease.
(d) X is Trypanosoma gambiense that belongs
to flagellated protozoans and causes
sleeping sickness.
- Read the following statements and select the correct option.
(a) Deuteromycetes reproduce only by asexual spores.
(b) The mycelium is unbranched in basidiomycetes.
(c) Fusion of two nuclei is known as plasmogamy.
(d) Truffles are edible zygomycetes that are often dug out
with trained dogs and pigs.
- Which of the following is not the asexual reproductive
structure in fungi?
(a) Sporangiospore (b) Conidia
(c) Oospore (d) Zoospore
- Select the incorrect statement among the followings.
(a) Viruses posses either DNA or RNA but never both.
(b) Most plant viruses are RNA viruses.
