NEET UG
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- 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... 1
- Sugar 'X'A. is found in honey.B. is a keto sugar.C. exists in α and β - anomeric forms.D. is laevorotatory.'X' is : Answer: 2. D-Fructose Key idea: match each property. D-Fructose is present in honey, is a keto sugar (ketohexose), exists as α and β anomers... 1
- Match List I with List II.List I (Name of Vitamin): A. Vitamin B_12 B. Vitamin D C. Vitamin B_2 D. Vitamin B_6List II (Deficiency disease): I. Cheilosis II. Convulsions III. Rickets IV. Pernicious anaemiaChoose the correct answer from the options giv… Answer: 2. A-IV, B-III, C-I, D-II Vitamin mathrmB₁₂ : pernicious anaemia (IV). Vitamin D: rickets (III). Vitamin B₂ (riboflavin): cheilosis... 1
- Identify the correct orders against the property mentioned :A. H_2O > NH_3 > CHCl_3 - dipole momentB. XeF_4 > XeO_3 > XeF_2 - number of lone pairs on central atomC. O-H > C-H > N-O - bond lengthD. N_2 > O_2 > H_2 - bond enthalpyChoose the correct ans… Answer: 1. A, D only A true: H₂O (1.85 D) > NH₃ (1.47 D) > CHCl₃ (1.04 D). B false: lone pairs on Xe are XeF₄ = 2, XeO₃ = 1, XeF₂ = 3, so th... 1