Oxygenic photosynthesis occurs in
(1) Chromatium
(2) Oscillatoria
(3) Rhodospirillum
(4) Chlorobium
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Which one is the wrong pairing for the disease and its causal organism?
(1) late blight of potato-Alternaria solani
(2) Black rust of wheat-Puccinia graminis
(3) Loose smut of wheat-Ustilago nuda
(4) Root-knot of vegetables-Meloidogyne sp.
Difficulty Level:
T. O. Diener discovered a
(1) free infectious RNA
(2) free infectious DNA
(3) infectious protein
(4) bacteriophage
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Consider the following four measures (A-D) that could be taken to successfully grow chick pea in an area where bacterial blight disease is common
(A) spray with Bordeaux mixture
(B) control of the insect vector of the disease pathogen
(C) use of only disease-free seeds
(D) use of varieties resistant to the disease
Which two of the above measures can control the disease?
(1) B and C
(2) A and B
(3) C and D
(4) B and D
Difficulty Level:
Modern detergents contain enzyme preparations of
(1) acidophiles
(2) alkaliphiles
(3) thermoacidophiles
(4) thermophiles
Difficulty Level:
Bacterial leaf blight of rice is caused by a species of
(1) Xanthomonas
(2) Pseudomonas
(3) Alternaria
(4) Erwinia
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In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statement is true about archaea?
(1) Archaea resemble eukarya in all respects
(2) Archaea have some novel features that are absent in other prokaryotes and eukaryotes
(3) Archaea completely differ from both prokaryotes and eukaryotes
(4) Archaea completely differ from prokaryotes
Difficulty Level:
Thermococcus, Methanococcus and Methanobacterium exemplify
(1) archaebacteria that contain protein homologous to eukarytic core histones
(2) archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
(3) bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria
(4) bacteria that contain a cytoskeleton and ribosomes
Difficulty Level:
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
(1) Casuarina equisetifolia
(2) Crotolaria juncea
(3) Cycas revoluta
(4) Cicer arietinum
Difficulty Level:
Which of the following is a slime mould?
(1) Rhizopus
(2) Physarum
(3) Thiobacillus
(4) Anabaena
Difficulty Level:
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