NEET Biology Previous year MCQ Bank With Answer Key - 08

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

(1) Fusarium

(2) Aspergillus

(3) Colletotrichum

(4) Penicillium

 

142. Which statement is correct for bacterial transduction?

(1) Bacteria obtained its DNA directly

(2) Transfer of some genes from one bacteria to another bacteria through virus

(3) Bacteria obtained DNA from other external source

(4) Transfer of genes from one bacteria to another bacteria by conjugation

 

143. In bacteria, plasmid is

(1) non-functional DNA

(2) extra – chromosomal material

(3) repetitive gene

(4) main DNA

 

144. Which bacteria is utilized in gober gas plant?

(1) Ammonifying bacteria

(2) Methanogens

(3) Denitrifying bacteria

(4) Nitrifying bacteria

 

145. Some bacteria are able to grow in Streptomycin containing medium due to

(1) reproductive isolation

(2) natural selection

(3) genetic drift

(4) Induced mutation

 

146. Chromosomes in a bacterial cell can be 1 – 3 in number and

(1) are always linear

(2) can be circular as well as linear within the same cell

(3) can be either circular or linear, but never both with in the same cell

(4) are always circular

 

147. Viruses are no more “alive” than isolated chromosomes because

(1) they both need food molecules

(2) both require the environment of a cell to replicate

(3) they both require oxygen for respiration

(4) they require both RNA and DNA

 

148. The chief advantage of encystment to an Amoeba is

(1) the ability to live for sometime without ingesting food

(2) the chance to get rid of accumulated waste products

(3) protection from parasites and predators

(4) the ability to survive during adverse physical conditions

 

149. During the formation of bread it becomes porous due to release of CO2 by the action of

(1) Virus

(2) Yeast

(3) Protozoans

(4) Bacteria

 

150. Which fungal disease spreads by seed and flowers?

(1) Covered smut of barley

(2) Loose smut of wheat

(3) Soft rot of potato

(4) Corn stunt

 

151. Which of the following statements is not true for retroviruses?

(1) The genetic material in mature retroviruses is RNA

(2) DNA is not present at any stage in the life cycle of retroviruses

(3) Retroviruses are causative agents for certain kinds of cancer in man

(4) Retroviruses carry gene for RNAdependent DNA polymerase

152. Which one of the following pairs is not correctly matched?

(1) Spirulina - Single cell protein

(2) Streptomyces - Antibiotic

(3) Rhizobium - Biofertilizer

(4) Serratia - Drug addiction

 

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

(1) a parasitic relationship with the alga

(2) a saprophytic relationship with the alga

(3) a symbiotic relationship with the alga

(4) an epiphytic relationship with the alga

 

154. Tobacco mosaic virus is a tubular filament of size

(1) 300 × 5 nm

(2) 700 × 30 nm

(3) 300 × 20 nm

(4) 300 × 10 nm

 

155. Which one of the following statements about viruses is correct?

(1) All viruses contain both RNA and DNA

(2) Nucleic acid of viruses is known as capsid

(3) Viruses are obligate parasites

(4) Viruses possess their own metabolic system

 

156. For retting of jute the fermenting microbe used is

(1) Helicobactor pylori

(2) Methophilic bacteria

(3) Streptococcus lactin

(4) Butyric acid bacteria

 

157. All of the following statements concerning the Actinomycetes filamentous soil bacterium Frankia are correct except that Frankia:

(1) Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids

(2) Can induce root nodules on many plant species

(3) Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host’s cortex

(4) Cannot fix nitrogen in the free-living state.

 

158. Auxopores and hormocysts are formed, respectively, by:

(1) Several cyanobacteria and several diatoms

(2) Some diatoms and several cyanobacteria

(3) Several diatoms and a few cyanobacteria.

(4) Some cyanobacteria and diatoms

 

159. Viruses that infect bacteria, multiply and cause their lysis, are called

(1) lytic

(2) lysozymes

(3) lysogenic

(4) lipolytic

160. The most thoroughly studied fact of the known bacteriaplant interactions is the

(1) nodulation of Sesbania stems by nitrogen fixing bacteria

(2) cyanobacterial symbiosis with some aquatic ferns

(3) plant growth stimulation by phosphatesolubilising bacteria

(4) gall formation on certain angiosperms by Agrobacterium