Plant Pathology - Study Mode

[#716] On culturing the young anther of a plant a botanist got a few diploid plants alongwith haploid plants. Which of the following might have given the diploid plants
Correct Answer

(C) Cells of anther wall

Explanation

Solution: On culturing the young anther of a plant a botanist got a few diploid plants along with haploid plants. Cells of anther wall might have given the diploid plants. The anther wall contains four layers called the epidermis, endothecium, middle layer, and tapetum, and all of them are diploid and produce diploid plants when cultured on artificial media. Inside anther locules, pollen mother cells undergo meiosis to form microspores enclosed in the tetrad. After release, microspores further develop into mature pollen.

[#717] Post harvest decay of apple is caused by
Correct Answer

(B) Candida saitoana

Explanation

Solution: Post-harvest decay of apple is caused by Candida saitoana. The ability of Candida saitoana to induce systemic resistance in apple fruit against Botrytis cinerea was investigated. To separate the antagonistic activity of C. saitoana from its ability to induce resistance, the antagonist and the pathogen were applied in spatially separated wounds. In addition to inducing systemic resistance, C. saitoana increased chitinase and beta-1,3-glucanase activities with a higher accumulation in fresh than in stored apples.

[#718] Calcium and magnesium can be deficient in
Correct Answer

(A) Acidic soils

Explanation

Solution: Calcium and magnesium can be deficient in Acidic soils. Soil acidity can restrict crop growth due to differences in nutrient availability, such as lower Ca and magnesium levels, and higher exchangeable aluminium levels. This is because the high concentration of hydrogen ions displaced Ca and magnesium (Mg), which can then leach on sandy soils.

[#719] One baule unit is
Correct Answer

(A) 223 kg N, 45 kg P, 76 kg K

Explanation

Solution: One baule unit is 223 kg N, 45 kg P, 76 kg K. Baule unit is defined as the amount of nutrient when added results in moving 'Y' (yield) halfway closer to A (maximum potential yield). One Baule unit will give 50% yield, the second Baule will give 50% of 50 i.e. 25% yield as such 2 baules will give 75% yield. One Baule unit is 223 kg N, 45 kg P, 76 kg K.

[#720] Which one of the following can not be detected by ELISA technique
Correct Answer

(C) Viroid

Explanation

Solution: Viroid cannot be detected by ELISA technique. The enzyme-linked immunosorbent assay is a commonly used analytical biochemistry assay, first described by Eva Engvall and Peter Perlmann in 1971. The assay uses a solid-phase type of enzyme immunoassay (EIA) to detect the presence of a ligand (commonly a protein) in a liquid sample using antibodies directed against the protein to be measured. ELISA has been used as a diagnostic tool in medicine, plant pathology, and biotechnology, as well as a quality control check in various industries, but it cannot detect Viroid.