Biological Classification — Page 4 | NEET Biology

Q31

Which bacteria is utilized in gober gas plant?

A Methanogens

B Nitrifying bacteria

C Ammonifying bacteria

D Denitrifying bacteria

Correct Answer

Option A

Solution

(a) Methanobacillus (methanogen) produces CH4 gas under anaerobic condition and is utilized in gobar gas plant.

Q32

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

A Paramoecium and Plasmodium belong to the same kingdom as that of Penicillium

B Lichen is a composite organism formed from the symbiotic association of an algae and a protozoan

C Yeast used in making bread and beer is a fungus

D Nostoc and Anabaena are examples of protista

Correct Answer

Option C

Solution

(c) Saccharomyces cervisiae is yeast used in making bread and commercial production of ethanol.

Q33

Which are most suitable indicators of SO2 pollution in the environment?

A Conifers

B Algae

C Fungi

D Lichens

Correct Answer

Option D

Solution

(d) Lichens can grow in places where sulphur dioxide is present in the environment.

Q34

In prokaryotes, the genetic material is

A linear DNA with histones

B circular DNA with histones

C linear DNA without histones

D circular DNA without histones

Correct Answer

Option D

Solution

(d) In prokaryotes nucleoid consists of double stranded circular DNA without histone protein.

Q35

The hereditary material present in the bacterium Escherichia coli is

A single stranded DNA

B deoxyribose sugar

C double stranded DNA

D single stranded RNA

Correct Answer

Option C

Solution

(c) In E. coli double stranded DNA is present.

Q36

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

A Cyanobacteria

B Archaebacteria

C Chemosynthetic autotrophs

D Heterotrophic bacteria

Correct Answer

Option D

Solution

(d) Lactobacillus bacteria convert milk into curd.

Q37

Transfer of genetic information from one bacterium to another in the transduction process is through

A Conjugation

B Bacteriophages released from the donor bacterial strain

C Another bacterium

D Physical contact between donor and recipient strain

Correct Answer

Option B

Solution

(b) Transfer of genetic information by virus is called transduction.

Q38

Lichens are a well known combination of an alga and a fungus where fungus has

A a saprophytic relationship with the alga

B an epiphytic relationship with the alga

C a parasitic relationship with the alga

D a symbiotic relationship with the alga

Correct Answer

Option D

Solution

(d) Lichens are composite organisms formed by symbiotic association between a fungus and alga.

Q39

Which statement is correct for bacterial transduction?

A Transfer of some genes from one bacteria to another bacteria through virus

B Transfer of genes from one bacteria to another bacteria by conjugation

C Bacteria obtains its DNA directly

D Bacteria obtains its DNA from other external source

Correct Answer

Option A

Solution

(a) Transduction is virus mediated gene transfer in bacteria.

Q40

Lichens indicate SO2 pollution because they

A show association between algae and fungi

B grow faster than others

C are sensitive to SO2

D flourish in SO2 rich environment

Correct Answer

Option C

Solution

(c) Lichens are sensitive to manufactured pollutants and used as pollution indicator organisms.