Zoology

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Match the following columns and select the correct option.Column - I | Column - II(a) Eosinophils | (i) Immune response(b) Basophils | (ii) Phagocytosis(c) Neutrophils | (iii) Release histaminase, destructive enzymes(d) Lymphocytes | (iv) Release gra… Answer: 1. (a) (iii), (b) (iv), (c) (ii), (d) (i) Eosinophils: release histaminase and destructive enzymes, (a) - (iii). Basophils: release... Body fluids: blood, blood groups, coagulation, lymph 1 answer
The QRS complex in a standard ECG represents : Answer: 3. Depolarisation of ventricles In an ECG, the P wave is atrial depolarisation, the QRS complex is ventricular depolarisation (the s... Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders 1 answer
Select the correct statement. Answer: 1. Glucocorticoids stimulate gluconeogenesis. Glucocorticoids (cortisol) stimulate gluconeogenesis, so option 1 is correct. Glucagon... Endocrine glands and hormones, mechanism of action 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Pituitary gland | (i) Grave's disease(b) Thyroid gland | (ii) Diabetes mellitus(c) Adrenal gland | (iii) Diabetes insipidus(d) Pancreas | (iv) Addison's disease Answer: 3. (a) (iii), (b) (i), (c) (iv), (d) (ii) Pituitary: diabetes insipidus (lack of ADH), (a) - (iii). Thyroid: Graves' disease (hypert... Hormonal disorders 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Floating Ribs | (i) Located between second and seventh ribs(b) Acromion | (ii) Head of the Humerus(c) Scapula | (iii) Clavicle(d) Glenoid cavity | (iv) Do not conne… Answer: 4. (a) (iv), (b) (iii), (c) (i), (d) (ii) Floating ribs (11th and 12th) do not connect with the sternum: (a) - (iv). Acromion is a p... Skeletal system, joints and disorders 1 answer
Goblet cells of alimentary canal are modified from : Answer: 2. Columnar epithelial cells Goblet cells, the mucus-secreting unicellular glands in the lining of the alimentary canal, are modifie... Animal tissues: epithelial, connective, muscular, neural 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Bt cotton | (i) Gene therapy(b) Adenosine deaminase deficiency | (ii) Cellular defence(c) RNAi | (iii) Detection of HIV infection(d) PCR | (iv) Bacillus thuringiens… Answer: 1. (a) (iv), (b) (i), (c) (ii), (d) (iii) Bt cotton uses a gene from Bacillus thuringiensis for pest resistance: (a) - (iv). Adenosi... Applications in health: human insulin, vaccines, gene therapy 1 answer
Flippers of Penguins and Dolphins are examples of : Answer: 2. Convergent evolution Penguin and dolphin flippers have similar function and shape but evolved in unrelated groups (a bird and a m... Adaptive radiation 1 answer
Identify the correct statement with reference to human digestive system. Answer: 3. Ileum is a highly coiled part. The ileum is the long, highly coiled part of the small intestine. Option 1 is wrong: the ileum ope... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
The enzyme enterokinase helps in conversion of : Answer: 2. trypsinogen into trypsin Enterokinase, secreted by the intestinal mucosa, activates trypsinogen into trypsin. Trypsin then activa... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
Presence of which of the following conditions in urine are indicative of Diabetes Mellitus ? Answer: 3. Ketonuria and Glycosuria Diabetes mellitus shows glycosuria (glucose in urine) and ketonuria (ketone bodies in urine). Because in... Hormonal disorders 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Organ of Corti | (i) Connects middle ear and pharynx(b) Cochlea | (ii) Coiled part of the labyrinth(c) Eustachian tube | (iii) Attached to the oval window(d) Stapes… Answer: 3. (a) (iv), (b) (ii), (c) (i), (d) (iii) Organ of Corti sits on the basilar membrane: (a) - (iv). Cochlea is the coiled part of the... Neural control: neuron, nervous system, nerve impulse 1 answer
Which of the following would help in prevention of diuresis ? Answer: 2. Reabsorption of Na ^+ and water from renal tubules due to aldosterone Diuresis is increased urine output. It is prevented when mo... Regulation of kidney function, disorders, dialysis 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Placenta | (i) Androgens(b) Zona pellucida | (ii) Human Chorionic Gonadotropin (hCG)(c) Bulbo-urethral glands | (iii) Layer of the ovum(d) Leydig cells | (iv) Lubri… Answer: 4. (a) (ii), (b) (iii), (c) (iv), (d) (i) Placenta secretes hCG: (a) - (ii). Zona pellucida is a layer of the ovum: (b) - (iii). Bul... Male and female reproductive systems 1 answer
Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle ? Answer: 1. High concentration of Estrogen Ovulation is triggered by the LH surge in mid-cycle, and that surge is itself caused by a high lev... Menstrual cycle 1 answer
Select the option including all sexually transmitted diseases. Answer: 1. Gonorrhoea, Syphilis, Genital herpes Sexually transmitted diseases include gonorrhoea, syphilis and genital herpes, so option 1 i... Reproductive health and STDs 1 answer
Identify the wrong statement with reference to immunity. Answer: 3. Active immunity is quick and gives full response. Key idea: Active immunity is slow; passive immunity is quick. In active immunit... Immunology basics and vaccines 1 answer
Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to : Answer: 1. Insect pests Key idea: The Bt toxin (Cry protein) kills certain insects. Bt cotton is resistant to insect pests such as cotton bo... Applications in agriculture: GMOs, Bt crops 1 answer
Which of the following statements is not correct ? Answer: 3. The functional insulin has A and B chains linked together by hydrogen bonds. Key idea: Mature insulin chains A and B are joined b... Applications in health: human insulin, vaccines, gene therapy 1 answer
The specific palindromic sequence which is recognized by EcoRI is : Answer: 1. 5' - GAATTC - 3'3' - CTTAAG - 5' Key idea: EcoRI recognises 5'-GAATTC-3' and cuts between G and A. A palindrome reads the same on... Tools: restriction enzymes, vectors, host 1 answer
Identify the wrong statement with regard to Restriction Enzymes. Answer: 4. Sticky ends can be joined by using DNA ligases. Key idea: Judge each statement against the NCERT chapter on restriction enzymes.... Tools: restriction enzymes, vectors, host 1 answer
Match the organism with its use in biotechnology.(a) Bacillus thuringiensis (i) Cloning vector(b) Thermus aquaticus (ii) Construction of first rDNA molecule(c) Agrobacterium tumefaciens (iii) DNA polymerase(d) Salmonella typhimurium (iv) Cry proteins… Answer: 2. (a) (iv), (b) (iii), (c) (i), (d) (ii) Key idea: Match each organism with its biotechnology use. Bacillus thuringiensis: Cry prot... Tools: restriction enzymes, vectors, host 1 answer
Match the following columns and select the correct option.Column - I: (a) 6 - 15 pairs of gill slits (b) Heterocercal caudal fin (c) Air Bladder (d) Poison stingColumn - II: (i) Trygon (ii) Cyclostomes (iii) Chondrichthyes (iv) Osteichthyes Answer: 1. (a) (ii), (b) (iii), (c) (iv), (d) (i) Key idea: Match each feature with its group. 6-15 pairs of gill slits: cyclostomes (ii) He... Chordates up to classes 1 answer
Which of the following statements are true for the phylum-Chordata ?(a) In Urochordata notochord extends from head to tail and it is present throughout their life.(b) In Vertebrata notochord is present during the embryonic period only.(c) Central ner… Answer: 4. (b) and (c) Key idea: Check each statement. (a) False: in Urochordata the notochord is present only in the larval tail. (b) True... Chordates up to classes 1 answer

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