8 12th Biology test-3 1 / 35 Which one in the following crosses shows phenotypic ratio of 3:1 ? AaBb X AaBb Aabb X Aabb AaBb X aabb aabb X AABb 2 / 35 “Gametes are never hybrid”, it is statement of - Law of Dominance Law of Random fertilization Law of Segregation Law of independent assortment 3 / 35 In a lake, phytoplanktons grow abundantly in – Limnetic zone Profundal zone Littoral zone Benthic region 4 / 35 The feature of the xerophytic plant leaves are – Single layer of epidermis Sunken stomata on lower epidermis Heavy cuticle Both (B) and (C) 5 / 35 In genetic engineering, restriction enzymes can be used for – Eukaryotic DNA only Bacterial DNA only Viral DNA only Any DNA fragment 6 / 35 Nif-genes are associated with – Ammonification Nitrification Nitrogen fixation Deammination 7 / 35 Which of the following cannot be detected in a developing foetus byamniocentesis ? Sex of the foetus Klinefelter syndrome Down’s syndrome Jaundice 8 / 35 How oral contraception pills used by females help in birth control Killing ova Inhibiting ovulation Killing sperms Forming barrier between sperm and ovum 9 / 35 HIV attacks on – B-cells Helper T-cells RBCs Blood Platelets 10 / 35 The most famous symbiotic nitrogen fixing bacterium is – Nitrosococcus Rhizobium Nitrosomonas Nitrobacter 11 / 35 BOD level in fresh water should not exceed beyond – 5 ppm 10 ppm 25 ppm 50 ppm 12 / 35 Decolouration of lead and silver paints is caused due to – Ozone (O3) Sulphur dioxide (SO2) Carbon monoxide (CO) Hydrogen sulphide (H2S) 13 / 35 Lohi is a breed of – Goat Geese Sheep Fowl 14 / 35 Which of the following is not a fresh water fish ? Catla Rohu Mrigal Salmon 15 / 35 Toxin produced by tetanus mainly affects – Cardiac muscles Respiratory system Voluntary muscles Both (A) and (B) 16 / 35 Advancement in genetic engineering has been possible due towhom? Exonucleases Transposons Endonucleases Oncogenes 17 / 35 Which of the following enhances or induces fusion of protoplast ?(A) IAA and kinetin(B) IAA and gibberellins(C) Polyethylene glycol and sodium nitrate(D) Sodium chloride and potassium chloride IAA and kinetin IAA and gibberellins Polyethylene glycol and sodium nitrate Sodium chloride and potassium chloride 18 / 35 Golden rice is a GMO plant in which the incorporated gene is meant for biosynthesis of – Vitamin-A Vitamin-B Vitamin-C Omega-3 19 / 35 Which plant is found in mangrove zone ? Acacia Pinus Rhizophora Tectona grandis 20 / 35 Reduction in vascular tissue, mechanical tissue and cuticle ischaracteristic feature of whom ? Hydrophytes Xerophytes Mesophytes Epiphytes 21 / 35 Plants growing on rocks are called as – Lithophytes Halophytes Sciophytes Both (A) and (C) 22 / 35 Parasitic angiosperms are - Decomposers Primary consumers Secondary consumers Tertiary consumers 23 / 35 Antibiotic cephalosporin is obtained from which one in the following? Bacterium Algae Mycoplasma Fungus 24 / 35 Induced abortion is – IUD PID MTP STD 25 / 35 Who discovered the molecular structure of Insulin ? Kornberg Sanger Beadle Nicholson 26 / 35 Characteristic of blue-green algae is – Photosynthesis Nitrogen fixation Fermentation Denitrification 27 / 35 Saffron is obtained from which plant ? Crocus sativus Solanum nigrum Curcuma longa Zingiber officinalis 28 / 35 Heart is developed from – Ectoderm Endoderm Mesoderm Ecto-mesoderm 29 / 35 Which one is analysed by amniocentesis ? Amino acids Amnion Amniotic fluid Both (A) and (B) 30 / 35 During menstrual cycle, the cyclic changes take place in – Corpus luteum Endometrium Perimetrium Myometrium 31 / 35 'Genotype-Phenotype’ concept was first proposed by Bateson Johannsen Punnet Sutton and Boveri 32 / 35 Which transgenic plant is rich in 𝛽–carotene and ferritin in thefollowing ? Golden rice Pomato BT-cotton Flavr savr 33 / 35 Rejection of organ transplant is due to – NK – cells Cytotoxic T-cells B-cells Suppressor T-cells 34 / 35 Archaeopteryx was evolved during which period of era ? Carboniferous Cretaceous Jurassic Triassic 35 / 35 Sunken stomata is found in – Halophytes Hydrophytes Mesophytes Xerophytes Please Enter Your Name, Email and Mobile NumberName is mandatoryEmail and Mobile number is optional NameEmailPhone Number Your score is The average score is 45% 0% Restart quiz