Plant Pathology - Study Mode
[#936] Loading of phloem means
Correct Answer
(D) Pouring of sugar into phloem
Explanation
Solution: Loading of phloem means pouring sugar into phloem. Phloem is the living tissue in vascular plants that transports the soluble organic compounds made during photosynthesis and is known as photosynthates, in particular the sugar sucrose, to the rest of the plant. This transport process is called translocation. The phloem is composed of still-living cells that transport sap. The sap is a water-based solution, but rich in sugars made by photosynthesis. These sugars are transported to non-photosynthetic parts of the plant, such as the roots, or into storage structures, such as tubers or bulbs.
[#937] During dark reaction the three carbon atoms of 3-PGA are derived from
Correct Answer
(C) RuBP + CO 2
Explanation
Solution: During the dark reaction, the three carbon atoms of 3-PGA are derived from RuBP + CO 2 . Dark reactions of photosynthesis are a series of chemical reactions that convert carbon dioxide and hydrogen-carrier compounds into glucose. This is because the process requires NADPH, which is short-lived and comes from light-dependent reactions. The CO 2 that is captured by enediol produces an unstable six-carbon compound called 2-carboxy 3-keto 1,5-biphosphoribotol that immediately splits into 2 molecules of 3-phosphoglycerate , a 3-carbon compound. Two 3-PGAs are produced for every CO 2 that enters the cycle, so this step utilizes two ATP per CO 2 fixed.
[#938] The term "Virus" means
Correct Answer
(B) Poison
Explanation
Solution: The term "Virus" means Poison. The word Virus is from the Latin neuter virus referring to poison and other noxious liquids, from the same Indo-European base as Sanskrit viṣa, Avestan visa, and ancient Greek all meaning 'poison'. A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea.
[#939] The green ear or downey mildew of pearlmillet was first time reported in India by
Correct Answer
(B) E. J. Butler
Explanation
Solution: The green ear or downey mildew of pearl millet was first time reported in India by E. J. Butler in 1907. Sir Edwin John Butler was an Irish mycologist and plant pathologist. He became the Imperial Mycologist in India. He has been called the Father of Mycology and Plant Pathology in India. The downy mildew disease in pearl millet was first reported in India as the disease of ill-drained lands where it developed into severe epidemics. In this disease, the leaf streaks turn brown and the leaves become shredded longitudinally.
[#940] Bacterial photosynthesis differs from that of higher plants in
Correct Answer
(A) Not liberating oxygen
Explanation
Solution: Bacterial photosynthesis differs from that of higher plants in not liberating oxygen. In plants, the proteins are held inside organelles called chloroplasts, which are most abundant in leaf cells, while in bacteria they are embedded in the plasma membrane. Apart from this, the main difference between bacterial and plant photosynthesis is plant liberates oxygen whereas bacterias do not generate oxygen.