Zoology

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Which of the following statements is correct ? Answer: 4. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye. Key idea: The cornea is made of dense c... Neural control: neuron, nervous system, nerve impulse 1 answer
Use of an artificial kidney during hemodialysis may result in :(a) Nitrogenous waste build-up in the body(b) Non-elimination of excess potassium ions(c) Reduced absorption of calcium ions from gastro-intestinal tract(d) Reduced RBC productionWhich of… Answer: 3. (c) and (d) are correct Key idea: Dialysis removes wastes, but cannot replace endocrine functions of the kidney. (a) and (b) are... Regulation of kidney function, disorders, dialysis 1 answer
Select the hormone-releasing Intra-Uterine Devices. Answer: 3. Progestasert, LNG-20 Key idea: Hormone-releasing IUDs are progestogen releasing. Progestasert and LNG-20 release progestogen (lev... Birth control, contraception and MTP 1 answer
Extrusion of second polar body from egg nucleus occurs : Answer: 1. after entry of sperm but before fertilization Key idea: Sperm entry stimulates completion of meiosis II. The secondary oocyte is... Gametogenesis: spermatogenesis and oogenesis 1 answer
Which of the following sexually transmitted diseases is not completely curable ? Answer: 3. Genital herpes Key idea: Bacterial STDs are curable with antibiotics; viral ones are not completely curable. Gonorrhoea and chlam... Reproductive health and STDs 1 answer
Identify the cells whose secretion protects the lining of gastro-intestinal tract from various enzymes. Answer: 2. Goblet Cells Key idea: Mucus protects the gut lining, and goblet cells secrete mucus. Chief cells secrete pepsinogen, oxyntic (pa... Animal tissues: epithelial, connective, muscular, neural 1 answer
Drug called 'Heroin' is synthesized by : Answer: 2. acetylation of morphine Key idea: Heroin (diacetylmorphine, smack) is made by acetylation of morphine. Morphine is extracted from... Adolescence, drug, alcohol and tobacco abuse 1 answer
DNA precipitation out of a mixture of biomolecules can be achieved by treatment with : Answer: 2. Chilled ethanol DNA is precipitated by adding chilled ethanol, and it then appears as fine threads that can be spooled out. Optio... Processes of recombinant DNA technology 1 answer
Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement. Answer: 2. The enzyme binds DNA at specific sites and cuts only one of the two strands. Key idea: Restriction endonucleases cut both strands... Tools: restriction enzymes, vectors, host 1 answer
Select the incorrect statement. Answer: 3. Inbreeding selects harmful recessive genes that reduce fertility and productivity. Inbreeding increases homozygosity, helps make... Mechanism: variation, mutation, recombination, natural selection 1 answer
Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL ? Answer: 1. 1500 mL Key idea: Expiratory capacity (EC) = tidal volume + expiratory reserve volume. EC = TV + ERV = 500 + 1000 = 1500\ mL . Th... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL ? Answer: 3. 100 beats per minute Cardiac output = stroke volume × heart rate. Stroke volume =100-50=50 mL. Heart rate=5000 mL/min/50 mL/beat=... Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders 1 answer
Which of the following factors is responsible for the formation of concentrated urine ? Answer: 2. Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys. Concentrated urine needs a steep osmotic gradien... Regulation of kidney function, disorders, dialysis 1 answer
Which of the following contraceptive methods do involve a role of hormone ? Answer: 1. Lactational amenorrhea, Pills, Emergency contraceptives Key idea: Only methods that change hormone levels involve a hormone. Oral... Birth control, contraception and MTP 1 answer
Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes ? Answer: 4. Bioreactor Large-scale culture of microbes for products such as enzymes needs a bioreactor, which gives controlled temperature, p... Processes of recombinant DNA technology 1 answer
Consider following features :(a) Organ system level of organisation(b) Bilateral symmetry(c) True coelomates with segmentation of bodySelect the correct option of animal groups which possess all the above characteristics. Answer: 1. Annelida, Arthropoda and Chordata We need a group with organ-system organisation, bilateral symmetry and a true coelom with segme... Non-chordates up to phyla 1 answer
In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taki… Answer: 2. Stabilizing Selection Here the average-weight babies survive and both extremes (very light and very heavy) die. Selection favours... Darwin and modern synthetic theory 1 answer
Variations caused by mutation, as proposed by Hugo de Vries, are : Answer: 2. random and directionless Hugo de Vries proposed mutation theory. Mutations are large, sudden changes that are random and directio... Darwin and modern synthetic theory 1 answer
Match the hominids with their correct brain size :(a) *Homo habilis* (i) 900 cc(b) *Homo neanderthalensis* (ii) 1350 cc(c) *Homo erectus* (iii) 650 - 800 cc(d) *Homo sapiens* (iv) 1400 ccSelect the correct option. Answer: 3. (a) (iii) (b) (iv) (c) (i) (d) (ii) Brain sizes: Homo habilis 650-800 cc, Homo erectus about 900 cc, Homo sapiens about 1350 cc,... Human evolution 1 answer
Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to : Answer: 2. inflammation of bronchi and bronchioles. Wheezing is typical of asthma, which is inflammation of the bronchi and bronchioles caus... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
Match the Column - I with Column - II :Column - I | Column - II(a) P - wave | (i) Depolarisation of ventricles(b) QRS complex | (ii) Repolarisation of ventricles(c) T - wave | (iii) Coronary ischemia(d) Reduction in the size of T - wave | (iv) Depola… Answer: 1. (a) (iv) (b) (i) (c) (ii) (d) (iii) Link each ECG part to the cardiac event. P-wave: depolarisation of the atria, so (iv). QRS co... Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders 1 answer
How does steroid hormone influence the cellular activities ? Answer: 2. Binding to DNA and forming a gene-hormone complex. Steroid hormones are lipid-soluble, so they enter the cell and bind to intrace... Endocrine glands and hormones, mechanism of action 1 answer
Which of the following muscular disorders is inherited ? Answer: 2. Muscular dystrophy Muscular dystrophy is a genetic (X-linked) disorder causing progressive degeneration of skeletal muscle. Tetan... Locomotion: movement types, muscle contraction 1 answer
Which part of the brain is responsible for thermoregulation ? Answer: 2. Hypothalamus The hypothalamus contains the thermoregulatory centre. It also controls hunger, thirst and hormone release. The cere... Neural control: neuron, nervous system, nerve impulse 1 answer

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