Biological Classification

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

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.

In which kingdom would you classify the archaea and nitrogen-fixing organisms, if the five-kingdom system of classification is used?

1. Plantae
2. Fungi
3. Protista
4. Monera

The chief advantage of encystment of an Amoeba is

1. the ability to survive during adverse physical conditions
2. the ability to live for some time without ingesting food
3. protection from parasites and predators
4. the chance to get rid of accumulated waste products.

In five kingdom system, the main basis of classification is

1. structure of nucleus
2. mode of nutrition
3. structure of cell wall
4. asexual reproduction.

Which statement is correct for bacterial transduction?

1. Transfer of some genes from one bacterium to another bacterium through virus.
2. Transfer of genes from one bacterium to another bacterium by conjugation.
3. Bacterium obtained its DNA directly from mother cell.
4. Bacterium obtained DNA from other external source.

Which fungal disease spreads by seed and flowers?

1. Loose smut of wheat
2. Corn smut
3. Covered smut of barley
4. Soft rot of potato

Which of the following secretes toxins during storage conditions of crop plants?

1. Aspergillus
2. Penicillium
3. Fusarium
4. Colletotrichum

In which of the following animals dimorphic nucleus is found?

1. Amoeba proteus
2. Trypanosoma gambiense
3. Plasmodium vivax
4. Paramecium caudatum

In protozoa like Amoeba and Paramecium, the organ for osmoregulation is

1. contractile vacuole
2. mitochondria
3. nucleus
4. food vacuole.

Organisms which obtain energy by the oxidation of reduced inorganic compounds are called

1. photoautotrophs
2. chemoautotrophs
3. saprozoic
4. coproheterotrophs

Cauliflower mosaic virus contains

1. ss RNA
2. ds RNA
3. ds DNA
4. ss DNA

What is true for cyanobacteria?

1. Oxygenic with nitrogenase
2. Oxygenic without nitrogenase
3. Non-oxygenic with nitrogenase
4. Non-oxygenic without nitrogenase

What is true for archaebacteria?

1. All halophiles
2. All photosynthetics
3. All fossils
4. Oldest living beings

Adhesive pad of fungi penetrates the host with the help of

1. mechanical pressure and enzymes
2. hooks and suckers
3. softening by enzymes
4. only by mechanical pressure

What is true for photolithotrophs?

1. Obtain energy from radiations and hydrogen from organic compounds
2. Obtain energy from radiations and hydrogen from inorganic compounds
3. Obtain energy from organic compounds
4. Obtain energy from inorganic compounds

Black rust of wheat is caused by

1. Puccinia
2. Ustilago
3. Albugo
4. Phytophthora.

Enzymes are not found in

1. fungi
2. algae
3. virus
4. cyanobacteria.

Which disease of man is similar to cattle's bovine spongiform encephalopathy?

1. Spongiocitis of cerebrum
2. Encephalitis
3. Spondylitis
4. Jakob–Creutzfeldt disease