Plant Pathology - Study Mode

[#511] First experiments in hydroponics were performed by
Correct Answer

(D) Sachs

Explanation

Solution: First experiments in hydroponics were performed by Sachs. It was Sachs who first showed that plants do not need soil but the minerals derived from it. This has been the starting point of the use of hydroponics for growing plants. Hydroponics is the technique of growing plants using a water-based nutrient solution rather than soil and can include an aggregate substrate, or growing media, such as vermiculite, coconut coir, or perlite.

[#512] Town compost contains merely
Correct Answer

(A) 1.4% N and 1.0% P 2 O 5

Explanation

Solution: Town compost contains merely 1.4% N and 1.0% P2O5. A mass of rotted organic matter made from waste is called compost. The compost made from town refuses like night soil, street sweepings, and dustbin refuse is called town compost. It contains 1.4% N, 1.00% P 2 O 5 and 1.4% K 2 O. Town Compost is a biodegradable organic fertilizer that is made from plant material. The fertilizer provides major nutrients like Nitrogen, Phosphorus, Potassium, Manganese, Calcium, Magnesium and others. It also enriches the soil with micronutrients like Boron, Zinc, Molybdenum, Iron, etc.

[#513] Sandal spike disease of sandal (Santalum album) is caused by
Correct Answer

(C) MLO

Explanation

Solution: Sandal spike disease of sandal (Santalum album) is caused by MLO. Spike disease caused by MLO (phytoplasma type) is the major disease of sandalwood. This disease is characterized by an extreme reduction in leaf size accompanied by stiffening and reduction of internode length. Sandal spike causal agent is a pleomorphic microorganism and is the smallest organism capable of independent replication.

[#514] Rhizobium of alfalfa group is
Correct Answer

(D) Melilolti

Explanation

Solution: Rhizobium of alfalfa group is Melilolti. The soil bacterium Sinorhizobium meliloti is capable of entering into a nitrogen-fixing symbiosis with Medicago sativa (alfalfa). Alfalfa is a widely cultivated forage crop of substantial economic value that possesses excellent agricultural traits, in that its roots can fix atmospheric nitrogen molecules with the help of symbiotic rhizobia. Particular low-molecular-weight forms of certain polysaccharides produced by S. meliloti are crucial for establishing this symbiosis.

[#515] Fruiting body of Fusarium is
Correct Answer

(A) Acervulus

Explanation

Solution: Fusarium is a type of fungus that can cause diseases in plants. It produces structures called fruiting bodies , which are involved in reproduction. These fruiting bodies release spores, helping the fungus spread and infect new plants. The question asks about the type of fruiting body produced by Fusarium . Acervulus, Sporodochia, and Pycnidium are all types of fungal fruiting bodies. Fusarium can actually produce all three of these types of fruiting bodies, depending on the specific species and environmental conditions. Therefore, the correct answer is D: All of these .