Plant Pathology - Study Mode
[#521] Nitrogen fixing enzyme found in root nodules is
Correct Answer
(B) Nitrogenase
Explanation
Solution: A nitrogen-fixing enzyme found in root nodules is Nitrogenase. Nitrogenases are enzymes that are produced by certain bacteria, such as cyanobacteria (blue-green bacteria) and rhizobacteria. These enzymes are responsible for the reduction of nitrogen (N 2 ) to ammonia (NH 3 ). Nitrogenases are the only family of enzymes known to catalyze this reaction, which is a key step in the process of nitrogen fixation.
[#522] Sink is related to
Correct Answer
(D) Transport of minerals
Explanation
Solution: The sink is related to the transport of minerals. The points of sugar delivery, such as roots, young shoots, and developing seeds, are called sinks. Sinks include areas of active growth (apical and lateral meristems, developing leaves, flowers, seeds, and fruits) or areas of sugar storage (roots, tubers and bulbs).
[#523] Maximum O 2 evolution occurs from
Correct Answer
(B) Marine phytoplankton
Explanation
Solution: Maximum O 2 evolution occurs from Marine phytoplankton. Phytoplankton is the autotrophic component of the plankton community and a key part of ocean and freshwater ecosystems. In a balanced ecosystem, they provide food for a wide range of sea creatures. Phytoplankton, also known as microalgae, are similar to terrestrial plants in that they contain chlorophyll and require sunlight to live and grow. They account for about half of the global photosynthetic activity and at least half of the oxygen production, despite amounting to only about 1% of the global plant biomass.
[#524] The target disease of Blockade is
Correct Answer
(C) Downy mildew
Explanation
Solution: The target disease of Blockade is Downy mildew. Downy mildew refers to any of several types of oomycete microbes that are obligate parasites of plants. Initial symptoms include large, angular or blocky, yellow areas visible on the upper surface. As lesions mature, they expand rapidly and turn brown.
[#525] In photosynthesis, photolysis of water is used in
Correct Answer
(A) Reduction of NADP +
Explanation
Solution: In photosynthesis, photolysis of water is used in the Reduction of NADP + . It acts as the primary electron acceptor for the photosystems. As part of the electron transport chain, it manufactures ATP. As a component of photosystem II, it catalyzes the hydrolysis of water. It is reduced and then carries electrons to the Calvin cycle. The electrons travel through the chloroplast electron transport chain to photosystem I (PSI), which reduces NADP + to NADPH.