Viruses:
1. contain both DNA and RNA as genetic material
2. are facultative parasites
3. cannot be crystallized
4. are nucleoproteins
Subtopic: Virus, Viroids & Prions |
74%
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Generally, the shape not seen in a bacterial cell is:
1. Rod like
2. Comma shaped
3. Spherical
4. Icosahedral
1. Rod like
2. Comma shaped
3. Spherical
4. Icosahedral
Subtopic: Kingdom Monera: Introduction |
95%
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All the following statements regarding diatoms are true except:
| 1. | The two overlapping shells of cell wall fit together as in a soap box. |
| 2. | They are the chief ‘producers’ in the oceans. |
| 3. | Their cell walls are embedded with silica. |
| 4. | Diatoms behave like heterotrophs when deprived of sunlight. |
Subtopic: Kingdom Protista: Chrysophytes |
90%
From NCERT
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Kingdom Protista has brought together Chlamydomonas, Chlorella with Paramoecium and Amoeba. On what basis were these organisms separated under previous classification systems?
1. Cell wall
2. Cell type
3. Body organisation
4. Mode of nutrition
1. Cell wall
2. Cell type
3. Body organisation
4. Mode of nutrition
Subtopic: Different Classification Systems |
56%
From NCERT
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Which of the following statements is incorrect regarding Mycoplasma?
1. These organisms are naturally resistant to antibiotics that inhibit protein biosynthesis
2. These organisms are naturally resistant to antibiotics that target the cell wall
3. These organisms are naturally resistant to antibiotics that inhibit DNA replication
4. These organisms are naturally resistant to antibiotics that inhibit folic acid metabolism
1. These organisms are naturally resistant to antibiotics that inhibit protein biosynthesis
2. These organisms are naturally resistant to antibiotics that target the cell wall
3. These organisms are naturally resistant to antibiotics that inhibit DNA replication
4. These organisms are naturally resistant to antibiotics that inhibit folic acid metabolism
Subtopic: Kingdom Monera: Actinomycetes & Mycoplasma |
59%
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What is the correct order of the steps involved in the sexual cycle of organisms belonging to the Kingdom Fungi?
| 1. | Meiosis in zygote — Plasmogamy — Karyogamy |
| 2. | Karyogamy — Meiosis in zygote — Plasmogamy |
| 3. | Plasmogamy — Karyogamy — Meiosis in zygote |
| 4. | Karyogamy — Plasmogamy — Meiosis in zygote |
Subtopic: Kingdom Fungi: Sexual Reproduction in Fungi |
82%
From NCERT
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Which of the following statements is not true regarding the mode of reproduction of organisms belonging to different classes of the Kingdom Fungi?
| 1. | Large number of members of Deuteromycetes are decomposers of litter and help in mineral cycling |
| 2. | Sex organs are absent in Basidiomycetes but plasmogamy is brought about by fusion of the nuclei of the gametes |
| 3. | The asexual spores produced by Ascomycetes are conidia produced exogenously on the special mycelium called conidiophores |
| 4. | In Ascomycetes and Basidiomycetes, an intervening Dikaryon stage exists before the fusion of parental nuclei |
Subtopic: Kingdom Fungi: Basidomycetes |
55%
From NCERT
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Cr-Jacob disease (CJD) in humans is caused by:
| 1. | An agent which consists of abnormally folded protein and is smaller in size to viruses |
| 2. | An agent having DNA |
| 3. | An agent which consists of abnormally folded protein and is similar in size to viruses |
| 4. | The same agent which causes potato spindle tuber disease |
Subtopic: Virus, Viroids & Prions |
55%
From NCERT
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Match the group of Protozoans to a feature these protozoans exhibit:
| Column 1 | Column 2 | ||
| A | Amoeboid | P | They have a cavity (gullet) that opens to the outside of the cell surface into which water laden food is steered |
| B | Flagellated | Q | Marine forms have silica shells on their surface |
| C | Ciliated | R | The parasitic forms cause diseases such as sleeping sickness |
| D | Sporozoans | S | They have an infectious spore-like stage in their life cycles |
| A | B | C | D | |
| 1 | R | Q | P | S |
| 2 | Q | R | P | S |
| 3 | Q | R | S | P |
| 4 | S | Q | R | P |
Subtopic: Protozoa |
87%
From NCERT
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Who showed that viruses could be crystallised and crystals consist largely of proteins?
1. M. W. Beijerinek
2. D. J. Ivanowsky
3. T. O. Diener
4. W. M. Stanley
1. M. W. Beijerinek
2. D. J. Ivanowsky
3. T. O. Diener
4. W. M. Stanley
Subtopic: Virus, Viroids & Prions |
83%
From NCERT
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