Q. No.Identify the incorrect statement regarding viroids:
1.
Viroids are the smallest infectious pathogens known.
2.
They are composed solely of a short strand of circular, single-stranded RNA that has no protein coating.
3.
The first recognized viroid, the pathogenic agent of the potato spindle tuber disease, was discovered by Theodor Otto Diener.
4.
The nucleic acid of viroids codes for only a few proteins.
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Bacteria that obtain energy from light and carbon from the fixation of carbon dioxide, using reducing equivalents from inorganic compounds are called as:
| 1. | chemolithoautotrophs | 2. | photolithoautotrophs |
| 3. | photoorganoheterotrophs | 4. | chemolithoheterotrophs |
Which of the following metabolism is unique to archaebacteria?
1. Methanogenesis
2. Diazotrophy
3. Photosynthesis
4. Methylotrophy
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Ascomycetes and Basidiomycetes have many homologies. All the following will be true but:
| 1. | Binucleate ascogenous hyphae of ascomyctes and binucleate secondary hyphae of basidiomycetes |
| 2. | Ascospore and basidiospore |
| 3. | Hook and crosier method in ascomycetes and clamp connection in basidiomycetes |
| 4. | Conidia in ascomycetes and basidiomycetes |
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The stages shown in the diagram given below can be seen during sexual reproduction in:
1. Rhizopus
2. Alternaria
3. Neurospora
4. Agaricus
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Identify the incorrect statement regarding Euglena:
1. Euglena's chloroplasts are surrounded by three membranes and contain pyrenoids
2. Euglena has two flagella rooted in basal bodies, one flagellum is very short, and does not protrude from the cell, while the other is relatively long
3. A photosensitive red spot is present towards the anterior end
4. When feeding as a heterotroph, Euglena takes in nutrients by osmotrophy
The structure shown in the given diagram is related to:
1. Slime moulds
2. Sporozoans
3. Cyanobacteria
4. Mycoplasma
The given diagram shows the life cycle of:
1. Puccinia graminis tritici with A part representing the stages in wheat plant and B part representing the stages in Barberry plant
2. Puccinia graminis tritici with A part representing the stages in Barberry plant and B part representing the stages in wheat plant
3. Ustilago tritici with A part representing the stages in wheat plant and B part representing the stages in Barberry plant
4. Ustilago tritici with A part representing the stages in Barberry plant and B part representing the stages in wheat plant
Identify the pair where the fungal pathogen is not correctly matched with the disease it causes in the concerned plant:
|
1. |
Cystopus candidus |
White rust of crucifers |
|
2. |
Uncinula necator |
Powdery mildew of grape-vine |
|
3. |
Erysiphe graminis |
Powdery mildew of cereals |
|
4. |
Phytophthora infestans |
Early blight of potato |
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