11 12th Biology test 1 1 / 35 What does operon model represent ? Gene function Gene regulation Gene expression Gene synthesis 2 / 35 Which of the following forms endosperm after fusion with malegamete ? Antipodals Synergids Secondary nucleus Oospores 3 / 35 Fossils are generally found in – Sedimentary rocks Metamorphic rocks Igneous rocks Both (B) and (C) 4 / 35 During which process Okazaki fragments are synthesized ? During continuous replication of DNA In lagging strand of DNA During discontinuous replication of DNA Both (B) and (C) 5 / 35 Human antibodies are made of – Glycoprotein Steroids Lipoprotein Both (B) and (C) 6 / 35 Which one is not a hydrophytic plant ? Acacia Trapa Hydrilla Nelumbo 7 / 35 Which is the number of chromosomes in Turner’s syndrome ? 44 45 46 47 8 / 35 Opium is obtained from – Atropa belladonna Erythroxylum coca Cannabis sativa Papaver somniferum 9 / 35 𝐵-lymphocytes are produced in – Blood Thymus Lymph Bone marrow 10 / 35 Which infective stage of Plasmodium occurs in human ? Sporozoite Cryptozoite Merozoite Meiocyte 11 / 35 Ti-plasmid is obtained from which of the following ? Agrobacterium tumefaciens Bacillus subtilis Agrobacterium rhizogenes E. coli 12 / 35 ‘Cry-gene’ prevents which crop from bollworm ? Wheat Tea Maize Cotton 13 / 35 Termination codon is – AUG GUG UAA AAA 14 / 35 DNA double helix is – Always circular Parallel and Complementary Both (A) and (B) Antiparallel and Complementary 15 / 35 Which organelle is not present in the cytoplasm of ovum ? Ribosome Centrosome Golgi body Mitochondria 16 / 35 Which enzyme is required in the process of transcription ? RNA polymerase DNA polymerase Helicase DNA polymerase III 17 / 35 Wings of insects and birds are called as - Connecting organ Homologous organ Analogous organ Vestigial organ 18 / 35 Relaxin is secreted by – Placenta Thyroid gland Both (A) and (B) Corpus luteum 19 / 35 Which one is pioneer in a xerosere ? Lichen Herbs Mosses Tree 20 / 35 Which of the following is a heavy-metal water pollutants ? Nickel Arsenic Phosphorus Both (A) and (B) 21 / 35 Ovulation takes place in – Placenta Ovary About 14th day Both (B) and (C) 22 / 35 Where is the Ranthambore National Park situated ? Gujarat Uttar Pradesh Rajasthan Madhya Pradesh 23 / 35 Sex chromosome of human beings are – XX AA XY Both (A) and (C) 24 / 35 The mobile genetic element is – Split gene Transposon Prions Intron 25 / 35 Peripatus is connecting link between – Arthropoda and Annelida Mollusca and Echinodermata Porifera and Coelenterata Reptile and Aves 26 / 35 Hugo de Vries proposed – Theory of Natural selection Law of Dominance Theory of Mutation Law of Segregation 27 / 35 Transgenic ‘hirudin’ is obtained from which of the following? Potato Brassica napus Tomato Ocimum sanctum 28 / 35 Entamoeba histolytica is a pathogen of which disease in thefollowing? Amoebiasis Tetanus Typhoid Chicken pox 29 / 35 The two components of an ecosystem are – Energy flow and mineral cycle Plants and animals Abiotic and Biotic Both (B) and (C) 30 / 35 Reproduction which does not involve gametic union is called ? Parasexual reproduction Apomixis Parthenogenesis Double fertilization 31 / 35 Eutrophication is found in – On mountains in agricultural land in saline soil in lakes 32 / 35 The F2 phenotypic ratio in dihybrid cross is – 15 :1 9:6:1 9:3:3:1 1:2:1 33 / 35 Roots of which plant give rise to a new plant ? Goldmohar Neem Dahlia Petunia 34 / 35 Which one is an example of endomycorrhiza ? Glomus Rhizobium Nostoc Agaricus 35 / 35 What causes acid rain ? Air pollution Automobile pollution Water pollution Insecticide pollution Please Enter Your Name, Email and Mobile NumberName is mandatoryEmail and Mobile number is optional NameEmailPhone Number Your score is The average score is 63% 0% Restart quiz