Plant Pathology - Study Mode

[#421] The availability of P 2 O 5 is maximum at
Correct Answer

(C) Neutral

Explanation

Solution: The availability of P 2 O 5 is maximum at Neutral. Phosphorus pentoxide is a chemical compound with the molecular formula P 2 O 5 . This white crystalline solid is the anhydride of phosphoric acid. It is a powerful desiccant and dehydrating agent. The soil pH for optimum phosphorus availability is 6.5. At high or neutral pH, phosphate reacts with calcium to form minerals, such as apatite. At low pH, under acidic conditions, phosphorus may react with aluminum and iron to form minerals, such as strengite and varescite.

[#422] 'Fungi and Plant Diseases' was written by
Correct Answer

(A) B. B. Mundakur

Explanation

Solution: 'Fungi and Plant Diseases' was written by B. B. Mundakur. Balchandra Bhavanishankar Mundkur was an Indian mycologist and plant pathologist. He worked at the Indian Agricultural Research Institute and later as a professor of botany at the University of Poona. He published Fungi and Plant Diseases in 1949 and a monograph on the Ustilaginales of India in 1952 apart from research papers. He was elected Fellow of the Indian National Science Academy in 1946.

[#423] Serological tests can't be used for detection of which of the following?
Correct Answer

(A) Viroids

Explanation

Solution: Serological tests can't be used for the detection of Viroids. CDC's serologic test is an enzyme-linked immunosorbent assay (ELISA)-based test to detect SARS-CoV-2 antibodies in serum or plasma components of blood. Virus antigens are investigated by antigen detection assays. Serological diagnosis is based on either the demonstration of the presence of virus-specific IgM antibodies or a significant increase in the levels of specific IgG antibodies.

[#424] All plant viruses (except cauliflower mosaic virus) contain
Correct Answer

(B) RNA

Explanation

Solution: All plant viruses (except cauliflower mosaic virus) contain RNA. Plant viruses are obligate intracellular parasites that do not have the molecular machinery to replicate without a host. The great majority have an RNA genome, which is usually small and single stranded (ss), but some viruses have double-stranded (ds) RNA, ssDNA or dsDNA genomes. Cauliflower mosaic virus (CaMV) is a member of the genus Caulimovirus, one of the six genera in the family Caulimoviridae, which are pararetroviruses that infect plants. The viral particles contain DNA instead of RNA.

[#425] Single super phosphate is
Correct Answer

(A) Water soluble fertilisers

Explanation

Solution: Single super phosphate is a water soluble fertilizer. Single superphosphate (SSP) was the first commercial mineral fertilizer, and it led to the development of the modern plant nutrient industry. This material was once the most commonly used fertilizer, but other phosphorus (P) fertilizers have largely replaced SSP because of its relatively low P content. SSP is the only Sulphur providing fertilizer in India which contains water soluble phosphorus easily taken up by plants.