BSc First Year (Sem 1 & 2) Zoology – Daily Revision MCQ (English Medium)
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The malaria parasite Plasmodium is transmitted to humans by the bite of:
Chapter 2: Protozoa
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Answer: D. female Anopheles mosquito
Only the female Anopheles sucks blood and carries Plasmodium sporozoites in its saliva; males feed on plant juices.In sponges (Porifera), the flagellated cells that line the spongocoel and create the water current are:
Chapter 3: Porifera
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Answer: A. choanocytes (collar cells)
Choanocytes beat their flagella to drive water through the canal system and trap food particles; they are typical of Porifera.The stinging cells used by Cnidaria (e.g. Hydra) for defence and capturing prey are:
Chapter 4: Cnidaria
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Answer: C. cnidoblasts (with nematocysts)
Cnidoblasts contain nematocysts that shoot out a thread to paralyse prey; the phylum is named after these cells.Flame cells are the excretory (osmoregulatory) structures of which phylum?
Chapter 5: Platyhelminthes and Aschelminthes
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Answer: B. Platyhelminthes
Flatworms such as Planaria and liver fluke use flame cells (protonephridia) for excretion and osmoregulation.According to Lindeman's ten percent law, about how much of the energy at one trophic level passes on to the next level?
Chapter 8: Ecological Pyramids and Energy Flow
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Answer: B. 10%
Only about 10% is stored in the next level's biomass; the rest is lost mainly as heat in respiration.In insects such as the cockroach, the main excretory organs are:
Chapter 12: Arthropoda
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Answer: C. Malpighian tubules
Malpighian tubules open at the junction of mid-gut and hind-gut and remove nitrogenous waste (uric acid) from the haemolymph.A water vascular (ambulacral) system with tube feet is a characteristic feature of:
Chapter 14: Echinodermata
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Answer: D. Echinodermata
Echinoderms like the starfish move, feed and breathe using tube feet worked by the water vascular system.The fluid mosaic model of the plasma membrane was proposed by:
Chapter 17: Plasma Membrane and Cell Transport
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Answer: A. Singer and Nicolson
Singer and Nicolson (1972) described the membrane as a fluid lipid bilayer with proteins floating in it; Danielli–Davson gave the sandwich model and Robertson the unit membrane.In double-stranded DNA, guanine pairs with cytosine through how many hydrogen bonds?
Chapter 18: Nucleus, Chromatin and Nucleic Acids
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Answer: D. 3
G≡C pairs are held by three hydrogen bonds, while A=T pairs are held by two.Crossing over between homologous chromosomes takes place in which substage of prophase I of meiosis?
Chapter 19: Cell Cycle, Mitosis and Meiosis
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Answer: C. Pachytene
Synapsis occurs in zygotene; crossing over (exchange between non-sister chromatids) occurs in pachytene; chiasmata become visible in diplotene.
BSc First Year (Sem 1 & 2): 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.