Plant Pathology - Study Mode
[#796] Single super phosphate contains
Correct Answer
(A) 16 - 20% P 2 O 5
Explanation
Solution: Single super phosphate contains 16 - 20% P 2 O 5 . It contains 3 major plant nutrients namely Phosphorus, Sulphur and Calcium along with traces of many micro-nutrients. Traditional routes for extraction of phosphate rock using sulfuric acid give single superphosphate, an approximate 1 : 1 mixture of Ca(H 2 PO 4 ) 2 and CaSO 4 phosphogypsum). It consists of approximately 16 - 20% of phosphorus and 11% of sulphur.
[#797] Who is regarded as the Father of virology?
Correct Answer
(A) M. W. Beijetnick
Explanation
Solution: M. W. Beijetnick is regarded as the Father of virology. Martinus Willem Beijerinck was a Dutch microbiologist and botanist who was one of the founders of virology and environmental microbiology. He is credited with the discovery of viruses, which he called " contagium vivum fluidum ". In 1898, he published results on the filtration experiments demonstrating that tobacco mosaic disease is caused by an infectious agent smaller than a bacterium.
[#798] Which can readily respire without oxygen?
Correct Answer
(B) Saccharomyces
Explanation
Solution: Saccharomyces can readily respire without oxygen. Saccharomyces is a genus of fungi that includes many species of yeasts. They are unicellular and saprotrophic fungi. Colonies of Saccharomyces grow rapidly and mature in three days. They are flat, smooth, moist, glistening or dull, and cream in colour. It is widely used in making bread, wine, and beer, through the process of fermentation that does not require oxygen.
[#799] What is the function of Vir C gene of Agrobacterium tumefaciens?
Correct Answer
(C) Transfer of T-DNA
Explanation
Solution: Transfer of T-DNA is the function of the Vir C gene of Agrobacterium tumefaciens. Agrobacterium tumefaciens induces tumors in plants by transferring a piece of single-stranded DNA, T-DNA, from its tumor-inducing (Ti) plasmid into plant cells. The subsequent integration and expression of T-DNA in the plant genome leads to the formation of crown gall tumors. Vir genes are directly involved in T-DNA cleavage from the Ti plasmid, T-DNA processing, transferring and integration into plant nuclei.
[#800] Phosphorus is drilled in upland crops to
Correct Answer
(A) Put it near roots
Explanation
Solution: Phosphorus is drilled in upland crops to Put it near roots. Phosphorus is important in cell division and the development of new tissue. Adding phosphorus to soil low in available phosphorus promotes root growth and winter hardiness, stimulates tillering and often hastens maturity.