Biological Classification

Nuclear membrane is absent in

1. Penicillium
2. Agaricus
3. Volvox
4. Nostoc

The cyanobacteria are also referred to as

1. protists
2. golden algae
3. slime moulds
4. blue green algae

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as

1. cyanobacteria
2. archaebacteria
3. chemosynthetic autotrophs
4. heterotrophic bacteria

Which one single organism or the pair of organisms is correctly assigned to its or their named taxonomic group?

1. Paramecium and Plasmodium belong to the same kingdom as that of Penicillium.
2. Lichen is a composite organism formed from the symbiotic association of an alga and a protozoan.
3. Yeast used in making bread and beer is a fungus.
4. Nostoc and Anabaena are examples of protista.

The pathogen Microsporum responsible for ringworm disease in humans belongs to the same kingdom of organisms as that of

1. Taenia, a tapeworm
2. Wuchereria, a filarial worm
3. Rhizopus, a mould
4. Ascaris, a round worm.

Which one of the following is incorrectly matched?

1. Root pressure – guttation
2. Puccinia – smut
3. Root – exarch protoxylem
4. Cassia – imbricate aestivation

Select the correct combination of the statements (i – iv) regarding the characteristics of certain organisms. (i) Methanogens are archaebacteria which produce methane in marshy areas. (ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen. (iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose. (iv) Mycoplasma lack a cell wall and can survive without oxygen. The correct statements are

1. (ii) and (iii)
2. (i), (ii) and (iii)
3. (ii), (iii) and (iv)
4. (i), (ii) and (iv)

Black (stem) rust of wheat is caused by

1. Alternaria solani
2. Ustilago nuda
3. Puccinia graminis
4. Xanthomonas oryzae

Given below is the diagram of a bacteriophage. In which one of the options all the four parts A, B, C and D are correct? [Figure]

1. A Collar, B Tail fibres, C Head, D Sheath
2. A Tail fibres, B Head, C Sheath, D Collar
3. A Head, B Sheath, C Collar, D Tail fibres
4. A Sheath, B Collar, C Head, D Tail fibres

Virus envelope is known as

1. capsid
2. virion
3. nucleoprotein
4. core