Plant Pathology - Study Mode

[#386] Sensitivity of PCR is
Correct Answer

(A) 1-10 pg/l

Explanation

Solution: The sensitivity of PCR is 1-10 pg/l. The polymerase chain reaction (PCR) is a method widely used to rapidly make millions to billions of copies (complete or partial) of a specific DNA sample, allowing scientists to take a very small sample of DNA and amplify it. PCR was invented in 1983 by the American biochemist Kary Mullis at Cetus Corporation.
The high sensitivity of PCR permits virus detection soon after infection and even before the onset of the disease. PCR assays can be performed directly on genomic DNA samples to detect translocation-specific malignant cells at a sensitivity that is at least 10,000 fold higher than that of other methods.

[#387] Who proposed 'one gene-one enzyme-one chemical reaction' theory?
Correct Answer

(C) Beadle and Tatum

Explanation

Solution: Beadle and Tatum proposed the 'one gene-one enzyme-one chemical reaction' theory. The one gene-one enzyme hypothesis is the idea that genes act through the production of enzymes, with each gene responsible for producing a single enzyme that in turn affects a single step in a metabolic pathway. The concept was proposed by George Beadle and Edward Tatum in an influential 1941 paperon genetic mutations in the mold Neurospora crassa and subsequently was dubbed the "one gene-one enzyme hypothesis" by their collaborator Norman Horowitz.

[#388] Fungi and Disease in Plants' was written in 1918 by
Correct Answer

(C) E. J. Butler

Explanation

Solution: Fungi and Disease in Plants' were written in 1918 by E. J. Butler. Sir Edwin John Butler was an Irish mycologist and plant pathologist. He became the Imperial Mycologist in India and later the first director of the Imperial Bureau of Mycology in England. During his twenty years in India, he began large-scale surveys on fungi and plant pathology and published the landmark book Fungi and Disease in Plants: An Introduction to the Diseases of Field and Plantation Crops, especially those of India and the East (1918) and has been called the Father of Mycology and Plant Pathology in India.

[#389] Mercuric chloride is used as a
Correct Answer

(C) Surface sterilant

Explanation

Solution: Mercuric chloride is used as a Surface sterilant. Mercuric Chloride is an odorless, white crystal or powder. Mercuric chloride is used as a disinfectant to remove surface microorganisms. The result showed that the increasing concentration of mercuric chloride inhibits the growth of bacteria efficiently with increasing contact time.

[#390] Cross pollination is
Correct Answer

(C) Allogamy

Explanation

Solution: Cross pollination is Allogamy. Allogamy or cross-fertilization is the fertilization of an ovum from one individual with the spermatozoa of another. In plants, allogamy is used specifically to mean the use of pollen from one plant to fertilize the flower of another plant and is usually synonymous with the term "cross-fertilization" or "cross-pollination" (outcrossing).