Plant Pathology - Study Mode

[#611] In 1943, Bengal had faced a serious famine which cause a great loss in rice yield, caused by
Correct Answer

(A) Helminthosporium oryzae

Explanation

Solution: In 1943, Bengal faced a serious famine which cause a great loss in rice yield, caused by Helminthosporium oryzae. The Bengal famine of 1943 was a famine in the Bengal province of British India during World War II. It was attributed to the Helminthosporium oryzae rice brown spot disease in India. Bengal famine of 1943, where the crop yield dropped by 40% to 90% and the death of 2 million people were recorded. It is a possible agroterrorism weapon. Brown spot of rice is a plant fungal disease that usually occurs on the host leaves and glume, as well as seedlings, sheaths, stems and grains of adult host plants.

[#612] Protein content of a virus is
Correct Answer

(C) 60 - 95%

Explanation

Solution: The protein content of a virus is 60 - 95%. A viral protein is both a component and a product of a virus. Viral proteins are grouped according to their functions, and groups of viral proteins include structural proteins, nonstructural proteins, regulatory proteins, and accessory proteins. Most viral structural proteins are components of the capsid and the envelope of the virus.

[#613] Largest amount of phosphate bond energy is produced in the process of respiration during
Correct Answer

(B) Krebs cycle

Explanation

Solution: The largest amount of phosphate bond energy is produced in the process of respiration during the Krebs cycle. The tricarboxylic acid (TCA) cycle, also known as the Krebs or citric acid cycle, is the main source of energy for cells and an important part of aerobic respiration. The Krebs cycle is used by organisms that respire (as opposed to organisms that ferment) to generate energy, either by anaerobic respiration or aerobic respiration. The cycle harnesses the available chemical energy of acetyl coenzyme A (acetyl CoA) into the reducing power of nicotinamide adenine dinucleotide (NADH).

[#614] Potato spindle tuber disease is transmitted
Correct Answer

(A) Mechanically

Explanation

Solution: Potato spindle tuber disease is transmitted mechanically. The disease is mechanically transmitted by contact between healthy and diseased plants, tractor wheels, tools, etc. Within potato plants, it is found most readily in the upper leaves and tubers. Transmission in the true seed of potato depends upon the cultivar. This disease can pass through both the pollen and ovule.

[#615] Chlorophyllous cells fewer in number, unique in shape with inner walls thicker are
Correct Answer

(A) Guard cells

Explanation

Solution: Chlorophyllous cells are fewer in number, and unique in shape with inner walls thicker are Guard cells. Guard cells are specialized plant cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore. Guard cells have low chlorophyll content and, low activity levels of RUBISCO and Calvin-Benson cycle enzymes.