Plant Pathology - Study Mode

[#721] Potassium sulphate has chemical composition
Correct Answer

(B) K 2 SO 4

Explanation

Solution: Potassium sulphate has chemical composition K 2 SO 4 . K 2 SO 4 is an inorganic chemical compound. It is also known as Sulfuric acid dipotassium salt or dipotassium sulfate. Potassium sulfate (K 2 SO 4 ) has been known since early in the 14 th century. It was studied by Glauber, Boyle and Tachenius. In the 17 th century, it was named arcanuni or sal duplicatum, as it was a combination of an acid salt with an alkaline salt. Potassium sulphate, also called sulphate of potash (SOP), arcanite, or archaically potash of sulphur, is the inorganic compound with formula K 2 SO 4 , a white water-soluble solid. It is commonly used in fertilizers, providing both potassium and sulphur.

[#722] In photosynthesis energy for passage of electron is the one that is absorbed by
Correct Answer

(A) Chlorophyll

Explanation

Solution: In photosynthesis energy for passage of electron is the one that is absorbed by Chlorophyll. Chlorophyll is any of several related green pigments found in cyanobacteria and in the chloroplasts of algae and plants. Chlorophyll allow plants to absorb energy from light. Chlorophylls absorb light most strongly in the blue portion of the electromagnetic spectrum as well as the red portion.

[#723] Fertilization involving carrying of male gametes by pollen tube is
Correct Answer

(B) Siphonogamy

Explanation

Solution: Fertilization involving carrying of male gametes by pollen tube is Siphonogamy. Siphonogamy is a condition in plants in which pollen tubes are developed for the transfer of the male cells to the eggs. The seed plants are siphonogamous, while in the lower plants, the male cells usually swim to the eggs. As a consequence, the spermatophytes were sometimes called siphonogams.

[#724] Viroids are
Correct Answer

(C) ss & circular

Explanation

Solution: Viroids are ss & circular. Viroids are small single-stranded, circular RNAs that are infectious pathogens. The first recognized viroid, the pathogenic agent of the potato spindle tuber disease, was discovered, and named by Theodor Otto Diener, a plant pathologist at the U.S. Department of Agriculture's Research Center in Beltsville, Maryland, in 1971. Viroids only infect plants, and infectious viroids can be transmitted to new plant hosts by aphids, by cross-contamination following mechanical damage to plants as a result of horticultural or agricultural practices, or from plant to plant by leaf contact.

[#725] Von Schmeling and Kulka first time demonstrated the systemic activity of fungicides in
Correct Answer

(B) 1966

Explanation

Solution: Von Schmeling and Kulka first time demonstrated the systemic activity of fungicides in 1966. A SYSTEMIC fungicide may be defined as a fungicidal compound that is readily translocated as such in the plant, rendering the tissues penetrated toxic to fungi. In their treatment they treated pinto bean and barley seed with 1,4-oxathiin derivatives gave disease control by systemic fungicidal action of such pathogenic fungi as Uromyces phaseoli and Ustilago nuda.