Q21
Viruses that infect bacteria, multiply and cause their lysis, are called
Correct Answer
Option C
Solution
(c) Viruses that cause breakdown of bacterial cell wall are called lytic virus.
Biological Classification
Q22
Which one of the following statements is wrong?
Correct Answer
Option C
Solution
(c) Eubacteria are the true bacteria, not false bacteria.
Q23
In which of the animals dimorphic nucleus is found?
Correct Answer
Option D
Solution
(d) Paramecium has two types of nucleus, a larger macronucleus and a smaller micronucleus.
Q24
There exists a close association between the alga and the fungus within a lichen. The fungus
Correct Answer
Option A
Solution
(a) Fungus forms the body of lichen as well as its attaching and absorbing structures.
Algae performs photosynthesis and provides food to the fungus.
Q25
The chief advantage of encystment to an Amoeba is
Correct Answer
Option B
Solution
(b) Encystment enables the zygote to survive under adverse conditions.
Q26
The most thoroughly studied fact of the known bacteria-plant interactions is the
Correct Answer
Option B
Solution
(b) Gall formation by Agrobacterium has been successfully used in genetic engineering.
Q27
Bacterial leaf blight of rice is caused by a species of
Correct Answer
Option A
Solution
(a) Bacterial leaf blight of rice is caused by Xanthomonas.
Q28
Organisms called methanogens are most abundant in a
Correct Answer
Option B
Solution
(b) Methanogens are archaebacteria, abundant in cattle yard and paddy fields.
Q29
The cyanobacteria are also referred to as
Correct Answer
Option D
Solution
(d) Cyanobacteria are also referred to as blue green algae.
Q30
Photosynthetic bacteria have pigments in
Correct Answer
Option D
Solution
(d) Chromatophores are internal membrane systems present in photosynthetic prokaryotes containing photosynthetic pigments.
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