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3 questions

Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively ? Answer: 1. Inflammation of bronchioles; Decreased respiratory surface Key idea: Asthma affects the airways. Emphysema damages the alveoli. A... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
Match the items given in Column I with those in Column II and select the correct option given below :Column I | Column IIa. Tricuspid valve | i. Between left atrium and left ventricleb. Bicuspid valve | ii. Between right ventricle and pulmonary arter… Answer: 1. a-iii b-i c-ii Key idea: Valves keep blood flowing in one direction. Tricuspid valve: between right atrium and right ventricle (i... Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders 1 answer
Match the items given in Column I with those in Column II and select the correct option given below :Column I | Column IIa. Tidal volume | i. 2500 – 3000 mLb. Inspiratory Reserve volume | ii. 1100 – 1200 mLc. Expiratory Reserve volume | iii. 500 – 55… Answer: 3. a-iii b-i c-iv d-ii Key idea: Recall the normal lung volumes of an adult. Tidal volume: about 500 mL (iii). Inspiratory reserve v... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
Match the items given in Column I with those in Column II and select the correct option given below :Column I | Column IIa. Glycosuria | i. Accumulation of uric acid in jointsb. Gout | ii. Mass of crystallised salts within the kidneyc. Renal calculi… Answer: 4. a-iv b-i c-ii d-iii Key idea: Match each disorder with its description. Glycosuria: glucose in urine (iv). Gout: uric acid crysta... Regulation of kidney function, disorders, dialysis 1 answer
Match the items given in Column I with those in Column II and select the correct option given below :Column I (Function) | Column II (Part of Excretory System)a. Ultrafiltration | i. Henle's loopb. Concentration of urine | ii. Ureterc. Transport of u… Answer: 3. a-iv b-i c-ii d-iii Ultrafiltration occurs in the Malpighian corpuscle (iv). Urine is concentrated in Henle's loop (i) by the cou... Excretion: modes, nephron, urine formation, osmoregulation 1 answer
Which of the following events does not occur in rough endoplasmic reticulum ? Answer: 4. Phospholipid synthesis Key idea: The rough ER has ribosomes and handles proteins that enter its lumen. Protein folding, cleavage... Endomembrane system: ER, Golgi, lysosomes, vacuoles 1 answer
Which of these statements is incorrect ? Answer: 4. Oxidative phosphorylation takes place in outer mitochondrial membrane. Key idea: Check where each respiratory step occurs. TCA cy... TCA cycle and electron transport system, ATP yield 1 answer
Which of the following terms describe human dentition ? Answer: 3. Thecodont, Diphyodont, Heterodont Key idea: Human teeth are of three kinds of arrangement. Thecodont: teeth are set in sockets of... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
Select the incorrect match : Answer: 4. Polytene Chromosomes – Oocytes of amphibians Key idea: Check each pair. Lampbrush chromosomes are diplotene bivalents (in amphibi... Cytoskeleton, cilia, flagella, centrioles; nucleus 1 answer
Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as Answer: 1. Polysome Key idea: A string of ribosomes on one mRNA, each making a copy of the polypeptide, is a polysome (polyribosome). A nucl... Transcription, genetic code, translation, protein biosynthesis 1 answer
According to Hugo de Vries, the mechanism of evolution is Answer: 3. Saltation Key idea: Hugo de Vries proposed mutation theory. He said evolution happens through single-step large mutations, called... Mechanism: variation, mutation, recombination, natural selection 1 answer
Match the items given in Column I with those in Column II and select the correct option given below :Column I | Column IIa. Proliferative Phase | i. Breakdown of endometrial liningb. Secretory Phase | ii. Follicular Phasec. Menstruation | iii. Luteal… Answer: 2. a-ii b-iii c-i Key idea: Match the phases of the menstrual cycle in the uterus and the ovary. Proliferative phase (endometrium gr... Menstrual cycle 1 answer
AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA ? Answer: 1. AGGUAUCGCAU The coding strand has the same sequence as the mRNA, with U in place of T (the template strand is the one complementa... Transcription, genetic code, translation, protein biosynthesis 1 answer
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by Answer: 4. Both sons and daughters Key idea: A woman has two X chromosomes and passes one at random to each child. Each child (son or daught... Sex-linked inheritance, Mendelian and chromosomal disorders 1 answer
Which of the following gastric cells indirectly help in erythropoiesis ? Answer: 4. Parietal cells Key idea: Parietal (oxyntic) cells secrete HCl and intrinsic factor. Intrinsic factor is needed to absorb vitamin... Body fluids: blood, blood groups, coagulation, lymph 1 answer
Match the items given in Column I with those in Column II and select the correct option given below :Column I | Column IIa. Fibrinogen | i. Osmotic balanceb. Globulin | ii. Blood clottingc. Albumin | iii. Defence mechanism Answer: 4. a-ii b-iii c-i Key idea: Plasma proteins have different roles. Fibrinogen: blood clotting (ii). Globulins: defence, as antibodies... Body fluids: blood, blood groups, coagulation, lymph 1 answer
Which of the following is an occupational respiratory disorder ? Answer: 3. Silicosis Key idea: Occupational respiratory disorders come from dust at work. Silicosis is caused by silica dust in grinding and... Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders 1 answer
Calcium is important in skeletal muscle contraction because it Answer: 1. binds to troponin to remove the masking of active sites on actin for myosin. Key idea: Ca²⁺ triggers muscle contraction. Calcium... Locomotion: movement types, muscle contraction 1 answer
Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system. Answer: 2. Aves Key idea: Birds (Aves) have a crop to store food and a gizzard to grind it. Their digestive tract is adapted to flight and a... Chordates up to classes 1 answer
Ciliates differ from all other protozoans in Answer: 4. having two types of nuclei Key idea: Ciliated protozoans such as Paramecium have two types of nuclei: a large macronucleus and on... Monera, Protista and Fungi 1 answer
Which of the following features is used to identify a male cockroach from a female cockroach ? Answer: 3. Presence of caudal styles Key idea: Male and female cockroaches differ in the last abdominal segments. Males have a pair of threa... Frog: digestive, circulatory, respiratory, nervous and reproductive systems 1 answer
Which one of these animals is not a homeotherm ? Answer: 3. Chelone Key idea: Homeotherms (warm-blooded) keep constant body temperature: birds and mammals. Macropus (kangaroo) and Camelus (... Chordates up to classes 1 answer
Stomata in grass leaf are Answer: 1. Dumb-bell shaped Grass (monocot) leaves have dumb-bell shaped guard cells. Kidney-shaped guard cells are in dicots. Rectangular a... Plant tissues and anatomy of root, stem, leaf 1 answer
Double fertilization is Answer: 4. Syngamy and triple fusion Double fertilisation is syngamy (one male gamete with the egg) plus triple fusion (the other male gamet... Double fertilization, endosperm and embryo development 1 answer

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