Plant Pathology - Study Mode

[#621] Which is most recent widely used fungicide for the control of powdery mildew
Correct Answer

(A) Calaxin

Explanation

Solution: Calaxin is the most recently widely used fungicide for the control of powdery mildew. Powdery mildew is a fungal disease that affects a wide range of plants. Powdery Mildew (Acrosporium tingitaninum) is a Whitish powdery mass that develops on the young leaves and twigs. Affected leaves get distorted. Powdery mildew can be controlled easily by spraying Wettable Sulphur (1.5 kg/200 litres of water). Sulphur dusting (20 kg/hectare) in the morning hours controls the disease effectively. Systemic fungicides like Bayleton (1 g/litre of water) or Calaxin (3 - 4 ml/10 litres of water) or Benomyl (5 g/10 litres of water) offer better and prolonged control of the disease.

[#622] Systema Naturae is published by
Correct Answer

(A) Carl Linnaeus

Explanation

Solution: Systema Naturae is published by Carl Linnaeus. Systema Naturae is one of the major works of the Swedish botanist, zoologist and physician Carl Linnaeus (1707 - 1778) and introduced the Linnaean taxonomy. Linnaeus published the first edition of Systema Naturae in the year 1735, during his stay in the Netherlands. The book was published in Latin. In it, he outlined his ideas for the hierarchical classification of the natural world, dividing it into the animal kingdom (regnum animale), the plant kingdom (regnum vegetabile), and the "mineral kingdom" (regnum lapideum).

[#623] Tick out the pair which is not correctly matched
Correct Answer

(B) Phorate - Nemachur

Explanation

Solution: A. Dazomet - Mylone Dazomet is a common soil fumigant that acts as an herbicide, fungicide, slimicide, and nematicide. It is also known as Mylone. It is a chemical used to kill pests that inhibit plant growth through gaseous degradation. B. Phorate - Nemachur is not correctly matched. Phorate is an organophosphate used as an insecticide and acaricide. It is relatively stable and hydrolyses only at very acidic or basic conditions. It is very toxic both for target organisms and for mammals including humans. C. Aldicarb - Temik Aldicarb is a carbamate insecticide which is the active substance in the pesticide Temik. It is effective against thrips, aphids, spider mites, lygus, fleahoppers and leafminers. D. Carbofuran - Furadan Carbofuran is a carbamate pesticide, widely used around the world to control insects on a wide variety of field crops, including potatoes, corn and soybeans. It is marketed under the trade name Furadan, by FMC Corporation.

[#624] Core metal of chlorophyll is
Correct Answer

(B) Mg

Explanation

Solution: Core metal of chlorophyll is Mg. Chlorophyll is any of several related green pigments found in cyanobacteria and in the chloroplasts of algae and plants. The presence of magnesium in chlorophyll was discovered in 1906, and was that element's first detection in living tissue. A molecular formula of C 55 H 70 O 6 N 4 Mg and a structure of (2-formyl)-chlorophyll were deduced based on NMR.

[#625] Which of the following fungi is known as aquatic mould?
Correct Answer

(A) Saproleginia

Explanation

Solution: Saproleginia is fungi that is known as aquatic mould. Saprolegnia is a genus of water moulds often called cotton moulds because of the characteristic white or grey fibrous patches they form. Saprolegnia filaments (hyphae) are long with rounded ends, containing the zoospores. Saprolegnia generally travels in colonies consisting of one or more species.