7 public questions tagged with this topic.
Trichoderma is a fungal biocontrol agent used to suppress plant pathogens.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biocontrol Agents - Bt Baculovirus Trichoderma
Trichoderma is a fungal biocontrol agent used to control soil-borne plant pathogens.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biocontrol Agents - Bt Baculovirus Trichoderma
Trichoderma is a fungal biocontrol agent used against plant pathogens.
Ref: NCERT Class 12 Biology Chapter 8: Microbes in Human Welfare Microbes as Biocontrol Agents - Bt Baculovirus Trichoderma
Viroids replicate autonomously using host transcriptional machinery despite lack of protein-coding capacity. Most pospiviroids utilize asymmetric rolling circle mechanism where circular RNA is transcribed by host RNA polymerase II into concatemeric complementary strands cleaved by host RNase and ligated to generate new circles. Chloroplast-replicating avsunviroids use symmetric pathway with self-cleavage via hammerhead ribozyme motifs. No DNA intermediate is involved, distinguishing them from retroviruses. Efficiency depends on RNA structure acting as promoter for Pol II, diverting enzyme from
Ref: Flores et al., Annu Rev Phytopathology 2005: Viroids Replicate via Rolling Circle Mechanism
Viroids represent subviral pathogens composed solely of small, non-coding, single-stranded circular RNA without encapsidation or protein synthesis capability. Ranging from 246 to 401 nucleotides, they form highly base-paired rod-like secondary structure conferring resistance to nucleases that hijack host RNA polymerase II for replication via rolling circle mechanism. Infecting higher plants causing diseases like potato spindle tuber, they replicate in nucleus or chloroplast. Absence of capsid distinguishes them from viruses. Small size, circularity and lack of protein coat are diagnostic featu
Ref: Diener TO, Annu Rev Virology: Viroids Characterized by ss Circular RNA Without Protein Coat
“Achatina fulica” for an invasive species that acts as a carrier of plant pathogens is. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Effective control reduces propagule pressure or population growth without causing unacceptable non-target effects. Repeated monitoring is necessary because seed banks, dormant stages, recolonization, and density-dependent compensation can reverse short-term gains. The remaining alternatives—“Nile perch”, “Cane toad”, “Zebra mussel”—refer to different states, proce
Ref: NCERT Biology Class 12, Ch. 15 Biodiversity and Conservation
Answer: C) Cyanide-resistant oxidase. For PSS- Sec G- Sec metabolites, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Low respiration; B) High β-glucosidase; D) Low toxin uptake. Name the process first, then pick the option that describes it — don’t reverse cause and effect.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.
