Biological Classification

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