BSc Third Year (Sem 5 & 6) Zoology – Daily Revision MCQ (English Medium)
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Who proposed the theory of 'inheritance of acquired characters' (use and disuse of organs)?
Chapter 2: Evolution
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Answer: B. Jean-Baptiste Lamarck
Lamarck's theory (Philosophie Zoologique, 1809) said characters acquired by use and disuse are passed to offspring; Weismann later opposed it.The fossil bird Archaeopteryx is regarded as a connecting link between which two groups?
Chapter 4: Fossils and the Geological Time Scale
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Answer: C. Reptiles and birds
Archaeopteryx had feathers and wings like birds, but also teeth, clawed fingers and a long bony tail like reptiles.In oogenesis, how many functional ova are finally formed from one primary oocyte?
Chapter 5: Gametogenesis and Fertilization
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Answer: A. 1
Meiosis of one primary oocyte gives one large ovum; the other products are small polar bodies that degenerate (one primary spermatocyte, by contrast, gives 4 sperms).The three primary germ layers (ectoderm, mesoderm and endoderm) are formed during:
Chapter 6: Early Embryonic Development
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Answer: D. Gastrulation
Gastrulation rearranges the cells of the blastula into the three germ layers; organs form later from these layers.Which visual pigment is present in the rod cells of the retina, helping vision in dim light?
Chapter 10: Sense Organs: Eye and Ear
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Answer: A. Rhodopsin
Rods contain rhodopsin (visual purple), which is very sensitive to dim light; cones contain iodopsin for colour vision in bright light.Which ecological pyramid is ALWAYS upright in every ecosystem?
Chapter 11: Ecology and Ecosystem
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Answer: C. Pyramid of energy
Energy is lost at every trophic level (about 10% passes on), so the energy pyramid can never be inverted; pyramids of numbers and biomass can be inverted.Which enzyme joins the Okazaki fragments on the lagging strand during DNA replication?
Chapter 12: DNA Replication
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Answer: D. DNA ligase
DNA ligase seals the gaps between Okazaki fragments by forming phosphodiester bonds; helicase unwinds, primase makes RNA primers.Dolly, the first mammal cloned from an adult body cell, was produced by which technique?
Chapter 15: Animal Biotechnology
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Answer: B. Somatic cell nuclear transfer
The nucleus of an adult udder (somatic) cell was put into an enucleated egg cell; no sperm or fertilisation was involved.In a honey bee colony, which member develops from an unfertilised egg?
Chapter 18: Apiculture
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Answer: A. Drone
Drones are haploid males developing from unfertilised eggs (parthenogenesis); queens and workers come from fertilised eggs.Which of the following is NOT an Indian major carp?
Chapter 20: Aquaculture
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Answer: D. Common carp (Cyprinus carpio)
The Indian major carps are catla, rohu and mrigal; the common carp is an exotic carp brought into India.
BSc Third Year (Sem 5 & 6): MCQ in other subjects
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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.