One gene- one enzyme hypothesis of Beadle and Tatum was experimentally proved on

• Saccharomyces 

• Neurospora crassa

• Lathyrus odoratus

• Claviceps

Microbes found to be very useful in genetic engineering are

• Escherichia coli and Agrobacterium tumefaciens

• Vibrio cholerae and a tailed bacteriophage

• Diplococcus sp. and Pseudomonas sp

• Diplococcus sp. and Pseudomonas sp

Genes for cytoplasmic male sterility in plants are generally located in

• mitochondrial genome

• cytosol

• chloroplast genome

• nuclear genome

Some of the characteristics of Bt cotton are 

• long fibre and resistance of aphids

• medium yield, long fibre and resistance to beetle pests

• high yield and production of toxic protein crystals which kill dipteran pests

• high yield and production of toxic protein crystals which kill dipteran pests

 Which of the following is not true for a species?

• Members of a species can interbreed

• Variations occur among members of species

• Each species is reproductively isolated from every other species

• Gene flow does not occur between the populations of a species

Female cone of Pinus is a

• Modified needles

• Modified long shoot

• Modified dwarf shoot

• Modified scale

Which one of the following proved effective for biological control of nematodal diseases in plants?

• Pisolithus tinctorius

• Pseudomonas cepacin

• Gliocladium virens

• Gliocladium virens

Which statement is correct for bacterial transduction?

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

• Transfer of genes from one bacteria to another bacteria by conjugation.

• Bacteria obtain DNA directly

• Bacteria obtain DNA from other external sources

Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

• Frequent irrigation of the crop

• Treatment of the plants with cytokinins alongwith a small dose of nitrogenous fertilizer

• Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5- trichlorophenoxy acetic acid

• Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5- trichlorophenoxy acetic acid

Triticale, the first man-made cereal crop, has been obtained by crossing wheat with

• rye

• pearl millet

• sugarcane

• sugarcane