Statement I: In a test cross, dominant phenotype is crossed with recessive parent. Statement II: Tes — NEET Chemistry Past Papers Chemistry Question

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Statement I: In a test cross, dominant phenotype is crossed with recessive parent. Statement II: Test cross helps in determine genotype. (A) Both correct (B) Both incorrect (C) I correct, II incorrect (D) I incorrect, II correct 100. Match The Column: Column-I Column-II A. Operator (i) Binding site for RNA polymerase B. Promoter (ii) Controls transcription C. Structural gene (iii) Codes enzyme D. Repressor (iv) Blocks transcription (1) A-(ii), B-(i), C-(iii), D-(iv) (2) A-(i), B-(ii), C-(iii), D-(iv) (3) A-(ii), B-(iii), C-(i), D-(iv) (4) A-(iv), B-(i), C-(iii), D-(ii) 101. Number of gametes from AaBbCc: (1) 4 (2) 6 (3) 8 (4) 16 102. Which statements are correct regarding transcription? A. DNA helicase unwinds DNA B. DNA polymerase synthesises 3′→5′ C. Primase synthesises RNA primer D. Ligase joins fragments (1) A, C, D (2) A and B (3) B and C (4) All ALPHA ACHIEVER COURSE_PHASE-1,2 9610WMD802466250009 103. Which statements are correct about codon? A. Codon is triplet B. Code is degenerate C. Code has punctuation D. Code is universal (1) A, B, D (2) A and C (3) B and C (4) All 104. Assertion (A): Linkage leads to deviation from Mendelian ratio. Reason (R): Linked genes are inherited together. (1) Both correct and explanation is also correct (2) Both correct and explanation is not correct (3) A correct, R incorrect (4) A incorrect, R correct 105. A community includes: (1) Only plants (2) Only animals (3) Populations of different species in a defined area (4) Only microorganisms 106. Consider the following statements: 1. Population density is always expressed as number of individuals per unit area. 2. Population density can also be expressed in terms of biomass. 3. Population density can never be measured in terms of percent cover. (1) Only 1 is correct (2) Only 2 is correct (3) 2 and 3 are correct (4) All are correct 107. Assertion (A): Predators help in biological control of pests. Reason (R): Predators reduce prey population naturally. (1) Both true, R explains A (2) Both true, R not explanation (3) A true, R false (4) A false, R true 108. A grassland ecosystem receives abundant sunlight and rainfall. The producers fix 20,000 kcal/m²/year of energy through photosynthesis. Out of this, 8,000 kcal/m²/year is used in respiration. Net Primary Productivity (NPP) is: (1) 20,000 kcal/m²/year (2) 12,000 kcal/m²/year (3) 8,000 kcal/m²/year (4) 28,000 kcal/m²/year 109. Decomposers convert organic matter into ______ substances that can be reused by producers. (1) Complex (2) Toxic (3) Inorganic (4) Protein 110. The amount of organic matter produced per unit area per unit time is called: (1) Biomass (2) Productivity (3) Standing crop (4) Decomposition 111. Assertion: The latitudinal gradient is influenced by solar energy availability. Reason: Higher solar energy increases primary productivity, supporting more species. (1) Both Assertion and reason are true and reason is correctly explained for assertion. (2) Both Assertion and reason are true but reason is not correctly explained for assertion. (3) Assertion is true but reason is false. (4) Assertion is false but reason is true. ALPHA ACHIEVER COURSE_PHASE-1,2 9610WMD802466250009 112. Which of the following is an ex-situ conservation method? (1) National park (2) Wildlife sanctuary (3) Zoological park (4) Biosphere reserve 113. For a DNA to function as a cloning vector the most essential requirement is :- (1) multiple restriction sites (2) several selectable markers (3) circular nature (4) 'ori' sequence 114. Among the following select which is not the tool of rDNA technology> :- (1) Restriction enzymes (2) Vectors (3) Host (4) Promoter 115. In the following figure Which DNA is not digested ? (1) Lane 1 (2) Lane 2 (3) Lane 3 (4) Lane 4 116. Given below are two statements: Statement-I : About 30 recombinant therapeutics have been approved for human use over the world over. Statement-II : In India, 12 of these are presently being marketed. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both Statement-I and Statement-II are incorrect. (2) Statement-I is correct but statement-II is incorrect. (3) Statement-I is incorrect but Statement-II is correct. (4) Both Statement-I and Statement-II are correct. 117. Given below are two statements: Statement-I : The first clinical gene therapy was given in 1990 to a 4 year old girl with Adenosine deaminase (ADA) deficiency. Statement-II : ELISA is based on the principle of antigen antibody interaction. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both Statement-I and Statement-II are incorrect. (2) Statement-I is correct but Statement-II is incorrect. (3) Statement-I is incorrect but Statement-II is correct. (4) Both Statement-I and Statement-II are correct. 118. Biotechnology mainly deals with - (1) Industrial scale production of biopharmaceutical (2) Biological use of genetically modified microbes, fungi, plants and animals (3) Both (1) and (2) (4) None of these 119. Cyclosporin A is produced by– (1) Trichoderma asperellum (2) Trichoderma polysporum (3) Trichoderma amazonicum (4) Trichoderma aggressivum ALPHA ACHIEVER COURSE_PHASE-1,2 9610WMD802466250009 120. Match List-I with List-II : List-I List-II (A) Semilunar valve close (I) During ventricle systole (B) Semilunar valve open (II) Due to closure of semilunar valve (C) I heart sound (Lubb) produced (III) During ventricle diastole (D) II heart sound (Dubb) produced (IV) Due to closure of A.V. valves Choose the correct answer from the options given below- (1) A–IV, B–III, C–II, D–I (2) A–II, B–IV, C–I, D–III (3) A–I, B–II, C–III, D–IV (4) A–III, B–I, C–IV, D–II 121. Which of following statement is incorrect ? (1) The tricuspid and bicuspid valves close due to attempted back flow of blood in atria during ventricular systole (2) Blood moves freely from atrium to the ventricle during joint diastole (3) Increased ventricular pressure causes opening of semilunar valves (4) Atrio-Ventricular node generates action potential to stimulate atrial contraction 122. Assertion : The movement of air into and out of the lungs is carried out by creating a pressure gradient between lungs and atmosphere. Reason : Expiration takes place when the intra pulmonary pressure is higher than atmospheric pressure. (1) Both Assertion & Reason are True & the Reason is a correct explanation of the Assertion. (2) Both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. (3) Assertion is True but the Reason is False. (4) Both Assertion & Reason are False. 123. Match List-I with List-II with respect to transportation of respiratory gases. List-I List-II A. 20-25% CO I. Bicarbonate B. 97% O II. Dissolved state in plasma C. 70% CO III. Carbamino-haemoglobin D. 3% O IV. Oxyhaemoglobin Choose the correct answer from the options given below: (1) A-III, B-IV, C-I, D-II (2) A-I, B-II, C-III, D-IV (3) A-II, B-I, C-IV, D-III (4) A-IV, B-I, C-II, D-III 124. Glucocorticoids stimulates :- (A) Gluconeogenesis (B) Lipolysis (C) Proteolysis (1) Only A and B (2) Only A (3) Only B (4) All A, B and C 125. Hormone which influence - (a) Body temperature (b) Metabolism (c) Menstrual cycle is/are (1) Necessarily a hormone of thyroid gland (2) Necessarily a hormone of adrenal gland (3) Necessarily a hormone of thymus gland (4) May be a hormone of thyroid or pineal gland 126. Which hormone stimulates the secretion of pancreatic enzymes from pancreas ? (1) Gastrin (2) Secretin (3) Cholecystokinin (CCK) (4) GIP st nd 2 2 2 2 ALPHA ACHIEVER COURSE_PHASE-1,2 9610WMD802466250009 127. Statement-I :- Visceral muscles do not exhibit any striation and are smooth in appearance. Statement-II :- Visceral muscles are under control of voluntary nervous system. (1) Both are correct (2) I is correct, II is incorrect (3) I is incorrect, II is correct (4) Both are incorrect 128. Find the mismatched pair among given below options : (1) Cervical vertebrae → 7 (2) First vertebra → Atlas (3) Thoracic vertebra → 5 (4) Sternum → Ventral side 129. Axial skeletal is made up of (1) Vertebral column complete (2) Skull (3) Sternum (4) All of the above 130. Match the column I and II ; Choose the correct option : Column I Column II (a) Unipolar neuron