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Q.61 The cell surface expands differently in different plant cells. Two common modes of expansion are shown below ( X and Y ). Each rectangular box represents a cell marked […]

Q.60 An RFLP marker shows sequence polymorphism in two ecotypes ( X and Y ) of a plant. In ecotype X, the marker contains one GAATTC site in its sequence, […]

Q.59 PIN proteins are plasma membrane-localized carrier proteins required for polar auxin transport in plants. Four different carrier proteins are shown in the diagram below labeled P1-P4. Arrow indicates the […]

Q.58 The three plots 𝐏, 𝐐 and R (in different units) in the graph below represent the dependence of photosynthesis rate (PR), leaf expansion rate (LER) and translocation rate of […]

Q.57 Consider the following pathway controlling time to flowering in wheat: If batch 𝑃 of wheat seed is vernalized before sowing and batch 𝑄 is not vernalized, then which of […]

Q.56 An inbred line of a plant with red flower and tall stem was crossed to another inbred line with white flower and short stem. The 𝐅𝟏 plants, which all […]

Q.55 When a plant is infected by a pathogen at one site, the distal parts of the plant and neighboring plants develop increased resistance to subsequent pathogen attack. Which of […]

Q.54 Which of the following is a neutral phenomenon? (A) Natural selection (B) Sexual selection (C) Genetic drift (D) Population bottleneck Genetic drift stands out as the neutral evolutionary force […]

Q.53 Which of the following is NOT involved in plant immune response? (A) Antimicrobial proteins (B) Hypersensitive response (C) Pattern recognition receptors (D) Interleukins Interleukins are signaling molecules exclusive to […]

Q.52 Atropine is a drug used in the management of pesticide poisoning. Which of the following plants can serve as a commercial source of this anticholinergic drug? (A) Datura metel […]