Plant Pathology - Study Mode

[#616] Northern blotting is used for detection of
Correct Answer

(B) RNA

Explanation

Solution: Northern blotting is used for the detection of RNA. The northern blot, or RNA blot, is a technique used in molecular biology research to study gene expression by detection of RNA (or isolated mRNA) in a sample. The northern blot technique was developed in 1977 by James Alwine, David Kemp, and George Stark at Stanford University. Northern blotting involves the use of electrophoresis to separate RNA samples by size, and detection with a hybridization probe complementary to part of or the entire target sequence.

[#617] Efficient fertilisers use results in
Correct Answer

(A) More crop per kg fertiliser

Explanation

Solution: Efficient fertilizers use results in more crop per kg fertilizer. The term "fertilizer efficiency" is defined as the amount of increase in yield of the harvested portion of the crop per unit of fertilizer nutrient applied where high yields are obtained. The timing and quantity of fertilizer depending on the source of fertilizer, nutrient content combination, and their interactions with land and land use aspects were crucial elements for getting an optimum response to fertilizer.

[#618] Greatest damage to fertiliser is caused by
Correct Answer

(C) Hooks

Explanation

Solution: The greatest damage to fertilizer is caused by Hooks. Plastic bags and burlap sacks are the most popular fertilizers. Burlap sacks have been around for a long time and still going strong. Hooks used to hold and pick bags causes holes in the bag. Granular products absorb moisture from the air, causing them to cake up like cement and thus, causing maximum damage to them.

[#619] Endosperm are
Correct Answer

(C) Triploid

Explanation

Solution: Endosperm is Triploid. The endosperm is a tissue produced inside the seeds of most flowering plants following double fertilization. Endosperm is formed when the two sperm nuclei inside a pollen grain reach the interior of a female gametophyte. One sperm nucleus fertilizes the egg cell, forming a zygote, while the other sperm nucleus usually fuses with the binucleate central cell, forming a primary endosperm cell. That cell created in the process of double fertilization develops into the endosperm.

[#620] Sulphur dioxide is toxic to plant at or above
Correct Answer

(B) 0.3 - 0.5 ppm

Explanation

Solution: Sulphur dioxide is toxic to plants at or above 0.3 - 0.5 ppm. Sulphur dioxide is a colourless gas at ambient temperature and pressure. It can be detected by taste at concentrations of 0.35 - 1.05 ppm and has a pungent, irritating odour with an odour threshold of 0.67 - 4.75 ppm.