Plant Pathology - Study Mode

[#66] The term Parasexuality was given by
Correct Answer

(A) Pontecarvo & Roper

Explanation

Solution: The term Parasexuality was given by Pontecarvo & Roper. Parasexuality is referred to or being reproduction that results in the recombination of genes from different individuals but does not involve meiosis and the formation of a zygote by fertilization as in sexual reproduction. It was first described in 1953 by the Italian geneticist Guido Pontecorvo during studies on Aspergillus nidulans, parasex describes a non-meiotic process of ploidy reduction that produces genetically diverse progeny.

[#67] 'Plant Pathology' written by
Correct Answer

(B) Agrios

Explanation

Solution: 'Plant Pathology' written by Agrios. The classic textbook in plant pathology outlines how to recognize, treat, and prevent plant diseases. It provides extensive coverage of abiotic, fungal, viral, bacterial, nematode, and other plant diseases and their associated epidemiology. It also covers the genetics of resistance and the modern management of plant disease.

[#68] Plasmolysis is due to
Correct Answer

(A) Exosmosis

Explanation

Solution: Plasmolysis is due to Exosmosis. Plasmolysis is a typical response of plant cells exposed to hyperosmotic stress. The loss of turgor causes the violent detachment of the living protoplast from the cell wall. As exosmosis is the movement of water molecules from within the cell to outside through a semipermeable membrane. This process ultimately causes shrinkage or plasmolysis of the cell. The plasmolytic process is mainly driven by the vacuole. Plasmolysis is reversible (deplasmolysis) and characteristic of living plant cells.

[#69] Enzymes connected with opening and closing of stomata is
Correct Answer

(B) PEP carboxylase

Explanation

Solution: Enzymes connected with the opening and closing of stomata are PEP carboxylase. Phosphoenolpyruvate carboxylase is an enzyme in the family of carboxy-lyases found in plants and some bacteria that catalyzes the addition of bicarbonate (HCO 3 - ) to phosphoenolpyruvate (PEP) to form the four-carbon compound oxaloacetate and inorganic phosphate. When water evaporation is minimal, it takes in CO 2 by fixing with PEP to form oxaloacetate through PEP carboxylase and causes the opening of stomata.

[#70] Which of the following is a fungicide with apoplastic movement?
Correct Answer

(A) Carboxin

Explanation

Solution: Carboxin is a fungicide with apoplastic movement. Carboxin was inhibitory to succinic dehydrogenase assayed with phenazine methosulphate plus DCIP when intact mitochondria were used as the enzyme source but not when the solubilized enzyme was used. The main site of action of carboxin, therefore, appears to lie between succinate and coenzyme Q. When water moves from cell to cell through the intercellular spaces or walls of the cells and hence on the outer side of the plasma membrane, is termed apoplastic movement.