BSc Second Year (Sem 3 & 4) Botany – Daily Revision MCQ (English Medium)
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The binomial system of naming plants was firmly established by:
Chapter 1: Plant Taxonomy
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Answer: B. Carolus Linnaeus
Linnaeus used two-word names (genus + species) consistently in Species Plantarum (1753), the starting point of plant nomenclature.Hypanthodium inflorescence is characteristic of:
Chapter 3: Morphology of Flower and Inflorescence
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Answer: C. Ficus
In Ficus (fig, banyan) the receptacle forms a hollow, flask-like structure with tiny flowers inside: the hypanthodium.The mango fruit, with a stony endocarp, fleshy mesocarp and thin epicarp, is a:
Chapter 4: Fruits, Seeds and Their Dispersal
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Answer: B. Drupe
A single-seeded fleshy fruit with a hard stony endocarp is a drupe; apple is a pome and orange a hesperidium.Syngenesious stamens (anthers fused, filaments free) are characteristic of the family:
Chapter 5: Study of Selected Dicot Families
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Answer: D. Asteraceae
In Asteraceae (Compositae) the five anthers unite into a tube around the style while the filaments stay free.In a typical angiosperm, the endosperm formed after double fertilisation is:
Chapter 9: Embryology of Angiosperms
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Answer: C. Triploid
One male gamete fuses with the two polar nuclei (or the diploid secondary nucleus), so the primary endosperm nucleus is 3n.Estimating the age of a tree by counting its annual rings is called:
Chapter 8: Secondary Growth
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Answer: B. Dendrochronology
Each growth ring (spring wood + autumn wood) usually forms in one year; dating by them is dendrochronology.In C₃ plants, the first stable product of CO₂ fixation in the Calvin cycle is:
Chapter 14: Photosynthesis
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Answer: D. 3-phosphoglyceric acid (3-PGA)
RuBisCO joins CO₂ to RuBP and the product splits into two molecules of 3-PGA, a 3-carbon compound (hence 'C₃'); OAA is the first product in C₄ plants.The respiratory quotient (RQ) when glucose is completely oxidised in aerobic respiration is:
Chapter 16: Respiration in Plants
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Answer: C. 1.0
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O, so RQ = CO₂ released / O₂ used = 6/6 = 1.0.Bolting (sudden elongation of the stem before flowering) in rosette plants such as cabbage is induced by:
Chapter 18: Plant Growth Regulators
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Answer: A. Gibberellin
Applied gibberellins cause internode elongation and bolting in rosette plants.Which mineral element is a component of the enzyme nitrogenase, needed for biological nitrogen fixation?
Chapter 13: Mineral Nutrition
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Answer: A. Molybdenum
Nitrogenase contains an iron–molybdenum cofactor, so molybdenum is essential for nitrogen fixation.
BSc Second Year (Sem 3 & 4): MCQ in other subjects
All questions are written by PadhaiNotes in our own words from the common syllabus of Maharashtra universities (NEP). Your own university's syllabus may differ a little.