Plant Pathology - Study Mode
[#686] Ions are absorbed by plants through
Correct Answer
(A) Carriers and pumps
Explanation
Solution: Ions are absorbed by plants through Carriers and pumps. Pumps energise transport directly through coupling to the hydrolysis of phosphoanhydride bonds. Many carriers are energized by the downhill flow of H + and channels allow the rapid, dissipative transport of cations driven by an electrochemical potential.
[#687] Urin contains only
Correct Answer
(D) 1.0% N
Explanation
Solution: Urine contains only 1.0% N. About 91–96% of urine consists of water. The remainder can be broadly characterized into inorganic salts, urea, organic compounds, and organic ammonium salts. Cellular metabolism generates many by-products that are rich in nitrogen and must be cleared from the bloodstream, such as urea, uric acid, and creatinine. Urine can also be used safely as a source of nitrogen in carbon-rich compost.
[#688] Major role of phosphorus in plant metabolism is
Correct Answer
(D) Generate metabolic energy
Explanation
Solution: Major role of phosphorus in plant metabolism is to Generate metabolic energy. Phosphorus is an essential nutrient both as a part of several key plant structure compounds and as a catalysis in the conversion of numerous key biochemical reactions in plants. Phosphorus is noted especially for its role in capturing and converting the sun's energy into useful plant compounds. Phosphorus promotes early root growth, winter hardiness, and seed formation, stimulates tillering, and increases water use efficiency.
[#689] Powdery mildew include in
Correct Answer
(C) Ascomycotina
Explanation
Solution: Powdery mildew includes in Ascomycotina. Powdery mildew is a fungal disease that affects a wide range of plants. Powdery mildew diseases are caused by many different species of ascomycete fungi in the order Erysiphales. Sexual reproduction is via chasmothecia (formerly cleistothecium), a type of ascocarp where the genetic material recombines. Powdery mildew fungi must be adapted to their hosts to be able to infect them. Within each ascocarp are several asci. Under optimal conditions, ascospores mature and are released to initiate new infections.
[#690] The presence of VAM enhances uptake of nutrients in general but particularly of
Correct Answer
(D) P
Explanation
Solution: The presence of VAM enhances uptake of nutrients in general but particularly of P. The hyphae of VAM penetrate the roots of host plants, and form specialized structures within arbuscles and sometimes vesicles. Mycorrhizae help increase the surface area of the plant root system because hyphae, which are narrow, can spread beyond the nutrient depletion zone. Hyphae are long extensions of the fungus, which can grow into small soil pores that allow access to phosphorus otherwise unavailable to the plant.