Q. No.Potato Spindle Tuber Disease is caused by a pathogen that is:
1.
A nucleocapsid
2.
A low molecular weight free RNA
3.
An abnormally folded protein
4.
A protozoan
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Prion is:
1. A nucleocapsid
2. A low molecular weight free RNA
3. An abnormally folded protein
4. A protozoan
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Identify the incorrectly matched pairs:
I. Louis Pasteur: Gave the name virus
II. D. J Ivanowsky: Recognized the causal agents of mosaicism in tobacco to be larger than bacteria
III. M. W. Beijerinek: Contagium vivum fluidum
IV. W. M. Stanley: Discovered HIV
| 1. | I and III | 2. | I and II |
| 3. | III and IV | 4. | II and IV |
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Which of the following is not a characteristic of dinoflagellates?
| 1. | Mostly fresh water and photosynthetic |
| 2. | Cell wall with stiff cellulosic plates |
| 3. | Two flagella |
| 4. | Various colored pigments in the cell |
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The chief producers in the oceans are:
| 1. | Floating hydrophytes | 2. | Blue green algae |
| 3. | Desmids | 4. | Diatoms |
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Deuteromycetes are also called as Fungi imperfecti because:
1. They do not have a thalloid body
2. They can contain chlorophyll
3. There are no parasitic members
4. Sexual phases are not known
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A ‘dikaryon’ stage is seen in the members of:
1. Ascomycetes and Phycomycetes
2. Ascomycetes and Basidiomycetes
3. Basidiomycetes and Phycomycetes
4. Basidiomycetes and Deuteromycetes
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Alternaria, Colletotrichum and Trichoderma belong to the class:
| 1. | Phycomycetes | 2. | Ascomycetes |
| 3. | Basidiomycetes | 4. | Deuteromycetes |
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In general, the viruses that infect plants have:
| 1. | Single stranded RNA | 2. | Single stranded DNA |
| 3. | Double stranded RNA | 4. | Double stranded DNA |
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