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Q.54 Retrograde signaling involves communication of (A) nucleus to the chloroplast (B) endoplasmic reticulum to the nucleus (C) nucleus to the mitochondria (D) chloroplast to the nucleus Retrograde signaling in plants […]

Q.53 The DNA content of a nucleus can be measured by (A) ESR Spectroscopy (B) FTIR Spectroscopy (C) Flow Cytometry (D) X-Ray Crystallography Flow cytometry is the standard technique for measuring […]

Q.52 The transition of water molecule from liquid to glassy state during cryopreservation is termed as (A) Vitrification (B) Hyperhydricity (C) Cryoprotectant (D) Habituation Vitrification prevents ice crystal damage in cryopreservation […]

Q.51 In which one of the following phases of cell cycle the drug colchicine exerts its effect? (A) G1 (B) G2 (C) S (D) M Colchicine disrupts microtubule formation, arresting cells […]

Q.50 One of the defense mechanisms adopted by plants for detoxification of heavy metals is the synthesis of (A) Phytochelatin (B) Calmodulin (C) Tubulin (D) Systemin Plants synthesize phytochelatins to […]

Q.49 During photorespiration the reactive oxygen species, H2O2, is produced in (A) Glyoxysome (B) Lysosome (C) Peroxisome (D) Dictyosome Hydrogen peroxide (H2O2) forms during photorespiration in plant cells under high […]

Q.48 The mutagen ethidium bromide acts as a (A) Deaminating agent (B) Alkylating agent (C) Intercalating agent (D) Base analogue Ethidium bromide is a classic intercalating agent used in molecular biology […]

Q.47 The diploid chromosome number of an organism is 2n = 14. What would be the expected chromosome numbers in a nullisomic? (A) 12 (B) 13 (C) 15 (D) 16 Nullisomy […]

Q.46 The stalk with which the ovule remains attached to the placenta is called (A) Micropyle (B) Chalaza (C) Funiculus (D) Hilum Ovule anatomy questions test fundamental plant reproductive morphology critical […]

Q.45 Scatchard analysis of ligand-receptor interaction yielded the graph shown below. The affinity of the ligand-receptor interaction can be obtained from Bound / Free Bound (molar) (A) Y intercept (B) X […]