Q. No.
What is true for Archaebacteria?
1. All are Halophiles.
2. All are photosynthetic.
3. All are fossils.
4. They are oldest living beings.
What is true for cyanobacteria:
1. Oxygenic with nitrogenase
2. Oxygenic without nitrogenase
3. Non-oxygenic with nitrogenase
4. Non-oxygenic without nitrogenase
An adhesive pad of fungi penetrates the host with the help of:
1. Mechanical pressure and enzymes
2. Hooke and suckers
3. Softening by enzymes
4. Only by mechanical pressure
Which of the following statements is correct?
| 1. | Organisms that depend on living plants are called saprophytes. |
| 2. | Some of the organisms can fix atmospheric nitrogen in specialized cells called sheath cells. |
| 3. | The fusion of two cells is called Karyogamy. |
| 4. | Fusion of protoplasms between two motile or non-motile gametes is called plasmogamy. |
Which one of the following statements about viruses is correct:
1. Viruses possess their own metabolic system
2. All viruses contain both RNA and DNA
3. Viruses are obligate parasites
4. Nucleic acid of viruses is known as capsid
Tobacco mosaic virus is a tubular filament of size:
1. 300 × 10 nm
2. 300 × 5 nm
3. 300 × 20 nm
4. 700 × 30 nm
In which kingdom would you classify the archaea and nitrogen-fixing organism, if the five-kingdom system of classification is used?
| 1. | Plantae | 2. | Fungi |
| 3. | Protista | 4. | Monera |
Viruses are no more "alive" than isolated chromosomes because:
| 1. | They require both RNA and DNA |
| 2. | They both need food molecules |
| 3. | They both require oxygen for respiration |
| 4. | Both require the environment of a cell to replicate |
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