Plant Pathology - Study Mode
[#151] Which ones are primarily absorbed b carotenoids?
Correct Answer
(D) Voilet and blue
Explanation
Solution: Violet and blue are primarily absorbed b carotenoids. Carotenoids are essential compounds along with chlorophylls in photosynthetic bacteria, algae, and plants and are involved in photosynthesis and photoprotection. Carotenoids harvest light energy and transfer this energy to chlorophylls through singlet-singlet excitation transfer. Carotenoids also called tetraterpenoids, are yellow, orange, and red organic pigments that are produced by plants and algae, as well as several bacteria, and fungi.
[#152] The micronutrient needed in smallest amount
Correct Answer
(D) Mo
Explanation
Solution: The micronutrient needed in the smallest amount is Molybdenum. Mo is the least abundant essential micronutrient found in most plant tissues and is often set as the base from which all other nutrients are compared and measured. Molybdenum is utilized by selected enzymes to carry out redox reactions. Molybdenum is required at very low levels where it is known to participate in various redox reactions in plants as part of the pterin complex Moco.
[#153] Meiosis is best seen in
Correct Answer
(A) Gamete
Explanation
Solution: Meiosis is best seen in Gamete. Meiosis means, 'lessening' since it is a reductional division is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells. The organism's diploid germ-line stem cells undergo meiosis to create haploid gametes, which fertilize to form the zygote. As a result, the production of gametes with half the number of chromosomes as the parent cell is the same.
[#154] The attack of sheath blight of rice (caused by Rhizoctonia solani) is more during
Correct Answer
(B) Active tillering stage
Explanation
Solution: The attack of sheath blight of rice (caused by Rhizoctonia solani) is more during the Active tillering stage. Rice sheath blight disease, caused by the basidiomycetous necrotroph Rhizoctonia solani, became one of the major threats to rice cultivation worldwide, especially after the adoption of highâyielding varieties. In rice, R. solani can infect the plant at any growth stage (Dath, 1990). The incidence of sheath blight is more severe in early maturing, semi-dwarf, highly tillering, and compact cultivars. The disease severity and incidence increase with plant age.
[#155] In the two light reactions of photosynthesis
Correct Answer
(B) PS I produces strong reductant NADPH while PS II a strong oxidant
Explanation
Solution: In the two light reactions of photosynthesis PS I produces the strong reductant NADPH while PS II is a strong oxidant. Photosystem I is an integral membrane protein complex that uses light energy to catalyze the transfer of electrons across the thylakoid membrane from plastocyanin to ferredoxin. The enzyme transfers the electron from reduced ferredoxin to NADP + to complete the reduction to NADPH in PS I. Photosystem II provides the electrons for all of photosynthesis to occur. The hydrogen ions (protons) generated by the oxidation of water help to create a proton gradient that is used by ATP synthase to generate ATP.