Plant Pathology - Study Mode

[#556] A diploid male angiospermic plant is crossed with tetraploid female plant. Endosperm of seed will be
Correct Answer

(D) Pentaploid

Explanation

Solution: A diploid male angiospermic plant is crossed with tetraploid female plant. Endosperm of seed will be Pentaploid. The endosperm is a tissue produced inside the seeds of most flowering plants following the fertilization of male and female gametes. If 2n male is crossed with 4n female, then endosperm will be 5n as female gamete after meiosis form 2n gametes + n male gamete + 2n polar nuclei, therefore 5n ploidy for endosperm. The endosperm plays an important role in supporting embryonic growth by supplying nutrients, protecting the embryo and controlling embryo growth by acting as a mechanical barrier during seed development and germination.

[#557] Nucleic acid content of virus is
Correct Answer

(A) 5 - 40%

Explanation

Solution: The nucleic acid content of the virus is 5 - 40%. Viruses are smaller and simpler in construction than unicellular microorganisms, and they contain only one type of nucleic acid either DNA or RNA surrounded by a protein coat. Genomes of DNA viruses that infect animals range in size from less than 2 kb of single-stranded DNA to over 375 kb of double-stranded DNA.

[#558] Ammonium produced by urea can be absorbed by roots or it can
Correct Answer

(A) Change to nitrate

Explanation

Solution: Ammonium produced by urea can be absorbed by roots or it can Change to nitrate. Urea is a stable colourless and odorless solid at room temperature that will melt at 135°C. It is highly water-soluble, and will slowly hydrolyze in the presence of water, to give ammonium carbamate which slowly decomposes to ammonia and carbon dioxide. Ammonium is converted to nitrate (NO 3 - ) via nitrification. Nitrate is the form that can be moved out of the soil profile by leaching or lost by denitrification. The conversion of ammonium to nitrate and the conversion of nitrate to N gases are both microbial processes.

[#559] Most widely used biocontrol agent is
Correct Answer

(A) Pseudomonas florescence

Explanation

Solution: The most widely used biocontrol agent is Pseudomonas florescence. P. fluorescens is a potential agent for biocontrol which suppress plant diseases by protecting the seeds and roots from fungal infection. They are known to enhance plant growth promotion and reduce the severity of many fungal diseases. Pseudomonas spp. have been reported to have the potential to improve plant biomass, relative water content, leaf water potential, and root adhering soil/root tissue ratio.

[#560] The Central Fertiliser Quality Control Institute is located at
Correct Answer

(D) Faridabad

Explanation

Solution: The Central Fertilizer Quality Control Institute is located in Faridabad. Given the increasing importance of fertilizer quality control and thrust on training to State Enforcement Officers, the laboratory was upgraded as an Institute and was renamed as Central Fertilizer Quality Control & Training Institute (CFQC&TI) in 1982 - 83. Its main objective is to undertake inspection and analysis of indigenous and imported fertilizers, standardization of methods of analysis, and provide technical guidance.