#neet

3 questions

What is the pattern of inheritance for polygenic trait? Answer: 2. Non-mendelian inheritance pattern Key idea: Polygenic traits are controlled by many genes, each with a small additive effect, and... Deviations: incomplete dominance, co-dominance, multiple alleles, blood groups, pleiotropy, polygenic inheritance 1 answer
Which one of the following enzymes contains 'Haem' as the prosthetic group? Answer: 4. Catalase Key idea: Catalase contains a haem group as its prosthetic group. RuBisCO has none, carbonic anhydrase uses zinc, and su... Enzymes: types, properties, action, classification 1 answer
Which chromosome in the human genome has the highest number of genes? Answer: 3. Chromosome 1 Key idea: According to the Human Genome Project, chromosome 1 has the most genes (2968), while the Y chromosome has... Human genome project and DNA fingerprinting 1 answer
Higher yield of NO in N_2(g) + O_2(g) ⇌ 2NO(g) can be obtained at[Δ H of the reaction = + 180.7 kJ mol^-1]A. higher temperatureB. lower temperatureC. higher concentration of N_2D. higher concentration of O_2Choose the correct answer from the options… Answer: 4. A, C, D only Key idea: Le Chatelier's principle. Δ H>0 (endothermic): higher temperature favours NO, so A is right and B is wrong... Delta G and equilibrium, factors affecting equilibrium, Le Chatelier's principle 1 answer
If the rate constant of a reaction is 0.03 s^-1, how much time does it take for 7.2 mol L^-1 concentration of the reactant to get reduced to 0.9 mol L^-1?(Given: log 2 = 0.301) Answer: 1. 69.3 s Key idea: the unit mathrms⁻¹ means first order: t=2.303/klog[A]₀/[A] . 7.2/0.9=8 , log8=3×0.301=0.903 . t=2.303×0.903/0.03... Integrated rate equations and half-life (zero and first order) 1 answer
Which one of the following reactions does NOT belong to "Lassaigne's test"? Answer: 4. mathrm2CuO + C xrightarrowΔ 2Cu + CO₂ Key idea: Lassaigne's test fuses the organic compound with sodium to convert N, S and halog... Qualitative analysis: detection of N, S, P, halogens 1 answer
The complex II of mitochondrial electron transport chain is also known as Answer: 2. Succinate dehydrogenase Key idea: Complex II of the electron transport chain is succinate dehydrogenase. It is the Krebs cycle en... TCA cycle and electron transport system, ATP yield 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
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
Which one of the following statements refers to Reductionist Biology? Answer: 1. Physico-chemical approach to study and understand living organisms. Key idea: Reductionist biology explains living organisms by s... What is living, biodiversity, need for classification 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
Epiphytes that are growing on a mango branch is an example of which of the following? Answer: 1. Commensalism Key idea: Commensalism is an interaction where one species benefits and the other is neither harmed nor helped. An e... Population interactions: mutualism, competition, predation, parasitism 1 answer
From the statements given below choose the correct option :A. The eukaryotic ribosomes are 80S and prokaryotic ribosomes are 70S.B. Each ribosome has two sub-units.C. The two sub-units of 80S ribosome are 60S and 40S while that of 70S are 50S and 30S… Answer: 1. A, B, C are true Key idea: Eukaryotic ribosomes are 80S, made of 60S and 40S subunits. Prokaryotic ribosomes are 70S, made of 50S... Mitochondria, ribosomes, plastids, microbodies 1 answer
Which one of the following is an example of ex-situ conservation? Answer: 3. Zoos and botanical gardens Key idea: Ex-situ conservation means protecting species outside their natural habitat. Zoos and botani... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Given below are two statements :Statement I : The primary source of energy in an ecosystem is solar energy.Statement II : The rate of production of organic matter during photosynthesis in an ecosystem is called net primary productivity (NPP).In the l… Answer: 3. Statement I is correct but statement II is incorrect Key idea: Statement II defines the wrong term. Statement I is correct: solar... Productivity and decomposition 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
Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Both wind and water pollinated flowers are not very colourful and do not produce nectar.Reason (R) : The flowers produce enormou… Answer: 2. Both A and R are true but R is NOT the correct explanation of A Key idea: Both A and R are true, but R does not explain A. Wind a... Pollination: types, agencies, examples 1 answer
Which of the following is an example of non-distilled alcoholic beverage produced by yeast? Answer: 3. Beer Key idea: Beer and wine are made by fermentation without distillation. Whisky, brandy and rum are made by fermentation follo... Microbes in industrial production 1 answer
Given below are two statements :Statement I : In a floral formula ⊕ stands for zygomorphic nature of the flower, and G (underlined) stands for inferior ovary.Statement II : In a floral formula ⊕ stands for actinomorphic nature of the flower and G (un… Answer: 4. Statement I is incorrect but statement II is correct Key idea: In floral formulae the symbol oplus means actinomorphic (radial sy... Flower, fruit and seed 1 answer
Streptokinase produced by bacterium Streptococcus is used for Answer: 4. Removing clots from blood vessels Key idea: Streptokinase is a clot buster. It is produced by Streptococcus and is used as a medi... Microbes in industrial production 1 answer
Match List - I with List - IIList-I: A. XeO_3 B. XeF_2 C. XeOF_4 D. XeF_6List-II: I. sp^3d; linear II. sp^3; pyramidal III. sp^3d^3; distorted octahedral IV. sp^3d^2; square pyramidalChoose the correct answer from the options given below : Answer: 1. A-II, B-I, C-IV, D-III Key idea: count bond pairs and lone pairs on Xe. XeO₃ : 3 bonds + 1 lone pair, sp³ , pyramidal (II). XeF₂... VSEPR theory and shapes of molecules 1 answer
C(s) + 2H_2(g) → CH_4(g); Δ H = -74.8 kJ mol^-1Which of the following diagrams gives an accurate representation of the above reaction? [R → reactants; P → products] Answer: 1. Energy diagram (1) Key idea: Δ H=-74.8 kJ/mol means an exothermic reaction: products lie 74.8 kJ below the reactants. Diagram (1)... Hess's law and enthalpies of reactions (bond dissociation, combustion, formation etc.) 1 answer
Match List - I with List - IIList-I (Example): A. Humidity B. Alloys C. Amalgams D. SmokeList-II (Type of Solution): I. Solid in solid II. Liquid in gas III. Solid in gas IV. Liquid in solidChoose the correct answer from the options given below : Answer: 2. A-II, B-I, C-IV, D-III Key idea: name the dispersed substance and the medium for each example. Humidity: water droplets/vapour in... Concentration terms: molality, molarity, mole fraction, percentage 1 answer

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