9
MCQ (Single Correct Answer)
Difference between virus and viroid is
A
absence of protein coat in viroid, but present in virus.
B
presence of low molecular weight RNA in virus, but absent in viroid,
C
Both (a) and (b)
D
None of the above
10
MCQ (Single Correct Answer)
With respect to fungal sexual cycle, choose the correct sequence of events.
A
Karyogamy, Plasmogamy and Meiosis
B
Meiosis, Plasmogamy and Karyogamy
C
Plasmogamy, Karyogamy and Meiosis
D
Meiosis, Karyogamy and Plasmogamy
11
MCQ (Single Correct Answer)
Viruses are non-cellular organisms, but replicate themselves once they infect the host cell. To which of the following kingdom do viruses belong to?
A
Monera
B
Protista
C
Fungi
D
None of these
12
MCQ (Single Correct Answer)
Members of phycomycetes are found in
(i) Aquatic habitats
(ii) On decaying wood
(iii) Moist and damp places
(iv) As obligate parasites on plants
Choose from the following options.
A
(i) and (iv)
B
(ii) and (iii)
C
All of these
D
None of these
13
What is the principle underlying the use of cyanobacteria in agricultural fields for crop improvement?
Explanation
Cyanobacteria are used in agricultural crop improvement because of their adicity to fix atmospheric nitrogen and make it available to the plants. This improves the yield of the crops and also reduces the cost of application of nitrogen fertilisers. e.g., Anabena and Nostoc.