Plant Pathology - Study Mode

[#776] Which of the following bacteria generally used in genetic engineering for transfer of character from one organism to another
Correct Answer

(D) Agrobacterium tumefaciens

Explanation

Solution: Agrobacterium tumefacien bacteria are generally used in genetic engineering for the transfer of character from one organism to another. Agrobacterium tumefaciens is a soil bacterium, which is used to transfer a small segment of DNA into the plant genome by the process known as transformation. The T-DNA that Agrobacterium inserts into the plant genome contains instructions that will be copied into every cell that develops from this first genetically modified cell.

[#777] Polygonum type of embryo sac/female gametophyte of angiosperms is
Correct Answer

(B) 7-celled, 8-nucleate

Explanation

Solution: Polygonum type of embryo sac/female gametophyte of angiosperms is 7-celled, 8-nucleate. The mitotic division (reduction division) of the mother megaspore gives rise to female gametophytes. The megaspore divides mitotically thrice to form firstly 2 then 4 and out of these 4 forms 8 nucleate embryo sacs. The process of formation of the 7-celled, 8-nucleate nature of female gametophyte.

[#778] Activated sludge contains
Correct Answer

(B) 3 - 6% N, 2% P 2 O 5 and 1.0% K 2 O

Explanation

Solution: Activated sludge contains 3 - 6% N, 2% P 2 O 5 and 1.0% K 2 O. The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewater using aeration and a biological floc composed of bacteria and protozoa. It uses air (or oxygen) and microorganisms to biologically oxidize organic pollutants, producing a waste sludge (or floc) containing the oxidized material.

[#779] The scientific name of potato blackleg pathogen is
Correct Answer

(B) Erwinia carotovora

Explanation

Solution: The scientific name of potato blackleg pathogen is Erwinia carotovora. Blackleg is a plant disease of potatoes caused by pectolytic bacteria that can result in stunting, wilting, chlorosis of leaves, necrosis of several tissues, a decline in yield, and at times the death of the potato plant. Blackleg in potatoes is most commonly caused by Pectobacterium atrosepticum (older synonym: Erwinia carotovora subsp. astroseptica), a gram-negative, nonsporulating, facultative anaerobe that is also associated with soft rot of potatoes.

[#780] Virus capsid is made up of
Correct Answer

(A) Protein

Explanation

Solution: A virus capsid is made up of Protein. A capsid is the protein shell of a virus, enclosing its genetic material. It consists of several oligomeric structural subunits made of proteins called protomers. The majority of the viruses have capsids with helical or icosahedral structure. Once the virus has infected a cell and begins replicating itself, new capsid subunits are synthesized using the protein biosynthesis mechanism of the cell. In some viruses, including those with helical capsids and especially those with RNA genomes, the capsid proteins co-assemble with their genomes.