- [Medium]The phenomenon in which the growing apical bud suppresses the growth of the lateral buds below it is governed mainly by which hormone produced at the ...
- [Medium]If a maize plant grows in height from twenty centimetres to fifty centimetres over a span of three days, what is its average absolute growth rate per ...
- [Hard]Short-day plants are induced to flower only when the duration of continuous darkness exceeds a critical length, a response perceived by which pigment ...
- [Easy]The dramatic elongation of internodes in genetically dwarf pea plants can be artificially induced by external application of which class of plant grow...
- [Easy]Glycolysis, the first stage in the breakdown of glucose during cellular respiration, takes place in which specific compartment of the plant cell?...
- [Medium]Considering the complete aerobic oxidation of one molecule of glucose, the net number of ATP molecules generated is conventionally calculated to be wh...
- [Easy]In the terminal oxidation step of aerobic respiration within mitochondria, which molecule serves as the final acceptor of electrons passing along the ...
- [Medium]A germinating seed rich in carbohydrates is respiring aerobically, so the respiratory quotient measured for this substrate is expected to be closest t...
- [Easy]A farmer notices that the older leaves of a crop turn yellow first while younger leaves stay green, suggesting a deficiency of which highly mobile mac...
- [Hard]The enzyme RuBisCO can bind both carbon dioxide and oxygen at the same active site, and this dual affinity directly explains the occurrence of which p...
- [Medium]In C4 plants such as maize, the primary carbon dioxide acceptor in the mesophyll cells differs from that of C3 plants and is correctly identified as w...
- [Medium]In the symbiotic nitrogen fixation occurring within root nodules of legumes, which oxygen-scavenging pigment protects the enzyme nitrogenase from inac...
- [Easy]During the light reactions of photosynthesis, the splitting of water that releases molecular oxygen and supplies electrons to photosystem II is most a...
- [Easy]During the ascent of sap in a tall tree, which cohesive and adhesive property based mechanism is primarily responsible for pulling water upward throug...
- [Easy]While classifying essential elements by quantity, an element required by plants in concentrations greater than ten millimoles per kilogram of dry matt...
- [Medium]Guard cells regulate stomatal opening such that when potassium ions accumulate inside them, the resulting change in their water relations causes which...
- [Hard]When light intensity is high and carbon dioxide is abundant but the temperature is unusually low, which factor most likely limits the overall rate of ...
- [Medium]When a plant cell is placed in pure water and its protoplast presses firmly against the cell wall, what is the value of its pressure potential and sol...
- [Medium]In the pressure-flow hypothesis of phloem translocation, food moves from a sugar source to a sugar sink driven mainly by which gradient established wi...
- [Medium]To synthesise one molecule of glucose, how many turns of the Calvin cycle are required, given that each turn fixes a single molecule of carbon dioxide...
- [Medium]A plant transpires 27 mL of water over 6 hours through 3 leaves equally. What is the average transpiration per leaf per hour? (mL h^-1)...
- [Easy]Respiratory quotient (RQ) for complete oxidation of glucose is:...
- [Hard]Active phloem loading of sucrose into sieve elements raises osmotic pressure causing:...
- [Hard]Photorespiration predominantly occurs in which plant type under high oxygen?...
- [Medium]Nitrate is reduced to nitrite in plants by which enzyme?...
- [Medium]A cell has solute potential Ψs = -0.7 MPa and pressure potential Ψp = 0.3 MPa. What is its water potential Ψw? (MPa)...
- [Easy]Which factor most immediately reduces transpiration rate on a leaf surface?...
- [Hard]A short-day plant will flower when the night length is:...
- [Medium]Indole-3-acetic acid (IAA) predominantly promotes which process?...
- [Easy]Which element is a component of chlorophyll and thus essential for photosynthesis?...
- [Easy]Which pigment primarily absorbs blue and red light driving photosynthesis in higher plants?...
- [Medium]The cohesion-tension theory explains ascent of sap primarily due to:...