Zoology

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In the above represented plasmid an alien piece of DNA is inserted at EcoRI site. Which of the following strategies will be chosen to select the recombinant colonies? Answer: 3. White color colonies will be selected. Key idea: The figure shows the EcoRI site inside the gene for β -galactosidase. Inserting... Tools: restriction enzymes, vectors, host 1 answer
While trying to find out the characteristic of a newly found animal, a researcher did the histology of adult animal and observed a cavity with presence of mesodermal tissue towards the body wall but no mesodermal tissue was observed towards the alime… Answer: 2. Pseudocoelomate Key idea: A pseudocoelom is a body cavity only partly lined by mesoderm. Here mesoderm is present towards the bod... Basis of animal classification 1 answer
Cardiac activities of the heart are regulated by :A. Nodal tissueB. A special neural centre in the medulla oblongataC. Adrenal medullary hormonesD. Adrenal cortical hormonesChoose the correct answer from the options given below : Answer: 1. A, B and C Only Key idea: The heart is regulated by nodal tissue (autorhythmic), the medullary cardiac centre (neural) and adrena... Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders 1 answer
Which of the following diagrams is correct with regard to the proximal (P) and distal (D) tubule of the Nephron. Answer: 2. Diagram option (2): P: HCO3-, NaCl, H2O out; H+, NH3 in. D: NaCl, H2O, HCO3- out; K+, H+ in Key idea: The proximal tubule reabsor... Excretion: modes, nephron, urine formation, osmoregulation 1 answer
Match List - I with List - II.List - I: A. Head; B. Middle piece; C. Acrosome; D. TailList - II: I. Enzymes; II. Sperm motility; III. Energy; IV. Genetic materialChoose the correct answer from the options given below : Answer: 1. A-IV, B-III, C-I, D-II Head: genetic material (IV) Middle piece: mitochondria give energy (III) Acrosome: enzymes for penetrating... Gametogenesis: spermatogenesis and oogenesis 1 answer
Find the correct statements :A. In human pregnancy, the major organ systems are formed at the end of 12 weeks.B. In human pregnancy the major organ systems are formed at the end of 8 weeks.C. In human pregnancy heart is formed after one month of gest… Answer: 4. A, C, D and E Only Key idea: This follows the NCERT timeline of human pregnancy. Heart forms after about one month (C correct). L... Pregnancy, placenta, parturition, lactation 1 answer
Which of the following statement is correct about location of the male frog copulatory pad ? Answer: 4. First digit of the fore limb Key idea: Male frogs have a copulatory (nuptial) pad on the first digit of each forelimb. It helps t... Frog: morphology and anatomy 1 answer
Polymerase chain reaction (PCR) amplifies DNA following the equation. Answer: 2. 2ⁿ Key idea: In each PCR cycle every DNA molecule is copied once, so the number of copies doubles. Starting from one DNA molecule... Processes of recombinant DNA technology 1 answer
Given below are two statements :Statement I : In the RNA world, RNA is considered the first genetic material evolved to carry out essential life processes. RNA acts as a genetic material and also as a catalyst for some important biochemical reactions… Answer: 1. Both statement I and statement II are correct Key idea: Both statements describe the RNA world idea correctly. Statement I: RNA w... Origin of life 1 answer
Match List - I with List - II.List - I: A. Emphysema; B. Angina Pectoris; C. Glomerulonephritis; D. TetanyList - II: I. Rapid spasms in muscle due to low Ca++ in body fluid; II. Damaged alveolar walls and decreased respiratory surface; III. Acute che… Answer: 4. A-II, B-III, C-IV, D-I Emphysema: damaged alveolar walls, less respiratory surface (II) Angina pectoris: acute chest pain when th... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
What are the potential drawbacks in adoption of the IVF method?A. High fatality risk to motherB. Expensive instruments and reagentsC. Husband/wife necessary for being donorsD. Less adoption of orphansE. Not available in IndiaF. Possibility that the e… Answer: 1. B, D, F only Key idea: Drawbacks of IVF are about cost, embryo survival and its limited social effect, not risk to life. B: corre... Amniocentesis, infertility and ART (IVF, ZIFT, GIFT) 1 answer
What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog ? Answer: 4. Vena cava Key idea: In a frog, veins called the vena cavae (precaval and postcaval) bring deoxygenated blood from the body to the... Frog: digestive, circulatory, respiratory, nervous and reproductive systems 1 answer
Given below are two statements :Statement I : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.Statement II : Both bone marrow and thymus provide micro environments for the development and maturation of… Answer: 2. Both Statement I and Statement II are correct. Key idea: primary lymphoid organs are bone marrow and thymus. Statement I is corre... Immunology basics and vaccines 1 answer
The following are the statements about non-chordates :A. Pharynx is perforated by gill slits.B. Notochord is absent.C. Central nervous system is dorsal.D. Heart is dorsal if present.E. Post anal tail is absent.Choose the most appropriate answer from… Answer: 4. B, D & E only Key idea: compare chordate and non-chordate features. Non-chordates have no notochord (B), the heart, if present, i... Basis of animal classification 1 answer
Match List I with List II :List I:A. Mesozoic EraB. Proterozoic EraC. Cenozoic EraD. Paleozoic EraList II:I. Lower invertebratesII. Fish & AmphibiaIII. Birds & ReptilesIV. MammalsChoose the correct answer from the options given below : Answer: 1. A-III, B-I, C-IV, D-II Mesozoic - age of reptiles; birds appear (A-III). Proterozoic - lower invertebrates (B-I). Cenozoic - age... Evidences of evolution 1 answer
Match List I with List II :List I:A. P waveB. QRS complexC. T waveD. T-P gapList II:I. Heart muscles are electrically silent.II. Depolarisation of ventricles.III. Depolarisation of atria.IV. Repolarisation of ventricles.Choose the correct answer from… Answer: 3. A-III, B-II, C-IV, D-I Key idea: read the ECG waves. P wave - depolarisation of atria (A-III). QRS complex - depolarisation of ve... Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders 1 answer
Choose the correct statement given below regarding juxta medullary nephron. Answer: 4. Loop of Henle of juxta medullary nephron runs deep into medulla. Juxtamedullary nephrons have long loops of Henle that run deep i... Excretion: modes, nephron, urine formation, osmoregulation 1 answer
Match List I with List II :List I:A. Exophthalmic goiterB. AcromegalyC. Cushing's syndromeD. CretinismList II:I. Excess secretion of cortisol, moon face & hyperglycemiaII. Hypo-secretion of thyroid hormone and stunted growth.III. Hyper secretion of t… Answer: 1. A-III, B-IV, C-I, D-II Exophthalmic goitre (Graves') - excess thyroid hormone, protruding eyeballs (A-III). Acromegaly - excess g... Hormonal disorders 1 answer
Given below are two statements :Statement I : The cerebral hemispheres are connected by nerve tract known as corpus callosum.Statement II : The brain stem consists of the medulla oblongata, pons and cerebrum.In the light of the above statements, choo… Answer: 4. Statement I is correct but Statement II is incorrect. Statement I is correct. The corpus callosum is the nerve tract joining the... Neural control: neuron, nervous system, nerve impulse 1 answer
Match List I with List II :List I:A. Non-medicated IUDB. Copper releasing IUDC. Hormone releasing IUDD. ImplantsList II:I. Multiload 375II. ProgestogensIII. Lippes loopIV. LNG-20Choose the correct answer from the options given below : Answer: 1. A-III, B-I, C-IV, D-II Non-medicated IUD - Lippes loop (A-III). Copper releasing IUD - Multiload 375 (B-I). Hormone releasing IUD... Birth control, contraception and MTP 1 answer
Identify the correct option (A), (B), (C), (D) with respect to spermatogenesis.[Flow chart: GnRH -> LH -> (B) -> Androgens -> Formation of spermatids; GnRH -> (A) -> (C) -> Factors -> (D)] Answer: 2. FSH, Leydig cells, Sertoli cells, spermiogenesis. Key idea: in males, LH acts on Leydig cells to make androgens, and FSH acts on... Gametogenesis: spermatogenesis and oogenesis 1 answer
Match List I with List II :List I:A. Unicellular glandular epitheliumB. Compound epitheliumC. Multicellular glandular epitheliumD. Endocrine glandular epitheliumList II:I. Salivary glandsII. PancreasIII. Goblet cells of alimentary canalIV. Moist surf… Answer: 4. A-III, B-IV, C-I, D-II Unicellular glandular epithelium - goblet cells (A-III). Compound epithelium - moist surface of buccal cav... Animal tissues: epithelial, connective, muscular, neural 1 answer
Match List I with List II related to digestive system of cockroach.List I:A. The structures used for storing of food.B. Ring of 6-8 blind tubules at junction of foregut and midgut.C. Ring of 100-150 yellow coloured thin filaments at junction of midgu… Answer: 2. A-IV, B-II, C-III, D-I Crop stores food (A-IV). Gastric caeca: a ring of 6-8 blind tubules at the foregut-midgut junction (B-II).... Frog: morphology and anatomy 1 answer
Which of the following are Autoimmune disorders?A. Myasthenia gravisB. Rheumatoid arthritisC. GoutD. Muscular dystrophyE. Systemic Lupus Erythematosus (SLE)Choose the most appropriate answer from the options given below : Answer: 3. A, B & E only Key idea: in an autoimmune disease the body attacks its own tissue. Myasthenia gravis, rheumatoid arthritis and SLE... Immunology basics and vaccines 1 answer

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