Plant Pathology - Study Mode
[#661] Smut of maize caused by
Correct Answer
(B) Ustilago maydis
Explanation
Solution: Smut of maize caused by Ustilago maydis. Corn smut is a plant disease caused by the fungus Ustilago maydis, which attacks corn (maize) and teosinte plants. The fungus infects all parts of the host plant by invading the ovaries of its host. The infection causes the corn kernels to swell up into tumor-like galls, whose tissues, texture, and developmental pattern are mushroom-like. These galls are made up of hypertrophied cells of the infected plant, along with resulting fungal threads, and blue-black spores.
[#662] Which one is wrong in photorespiration?
Correct Answer
(C) It is characteristic of C 4 plants
Explanation
Solution: All the given features about photorespiration are correct except that it is characteristic of C 4 plants. This process does not occur in C 4 plants. Photorespiration refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis.
[#663] Excess of ATP inhibits respiration by inhibiting one of the following enzymes
Correct Answer
(A) Phosphofructokinase
Explanation
Solution: Excess of ATP inhibits respiration by inhibiting one of the following enzymes that are Phosphofructokinase. Low concentrations of ATP inhibited phosphofructokinase activity by decreasing the affinity of the enzyme for the other substrate, fructose 6-phosphate. Citrate, and other intermediates of the tricarboxylic acid cycle, also inhibited the activity of phosphofructokinase.
[#664] Respiration is
Correct Answer
(B) Exothermic process
Explanation
Solution: Respiration is an Exothermic process. Respiration is the movement of oxygen from the outside environment to the cells within tissues and the removal of carbon dioxide in the opposite direction that's to the environment. It refers to a metabolic process by which an organism obtains energy (in the form of ATP and NADPH) by oxidizing nutrients and releasing waste products, as energy is released in this process, thus, it is an exothermic process.
[#665] During monsoon, the rice crop of eastern states of India shows lesser yield due to limiting factor of
Correct Answer
(B) Light
Explanation
Solution: During monsoon, the rice crop of eastern states of India shows lesser yield due to the limiting factor of light. Rice is considered the master crop of coastal India and in some regions of eastern India, where during the summer and monsoon seasons, both high temperature and heavy rainfall provide ideal conditions for the cultivation of rice. At some places in the eastern and southern parts of India, rice crop of short light duration is followed by the rice crop of long light duration. Therefore, light is the limiting factor during monsoon season.