#neet
- Given below are two statements:Statement I: RNA mutates at a faster rate.Statement II: Viruses having RNA genome and shorter life span mutate and evolve faster.In the light of the above statements, choose the correct answer from the options given bel… Answer: 2. Both Statement I and Statement II are true. Key idea: RNA genomes mutate faster than DNA genomes. Statement I is true: RNA is les... 1
- Which one of the following symbols represents mating between relatives in human pedigree analysis? Answer: 3. [pedigree symbol: square joined to circle by double line] Key idea: In a human pedigree, a double horizontal line between the mal... 1
- The parts of human brain that helps in regulation of sexual behaviour, expression of excitement, pleasure, rage, fear etc. are : Answer: 2. Limbic system & hypothalamus Key idea: The limbic system together with the hypothalamus controls emotions and behaviour. It regul... 1
- Match List I with List II.List I: A. Logistic growth; B. Exponential growth; C. Expanding age pyramid; D. Stable age pyramidList II: I. Unlimited resource availability condition; II. Limited resource availability condition; III. The percent individua… Answer: 2. A-II, B-I, C-III, D-IV Key idea: Link each growth form or pyramid to its condition. Logistic growth: limited resources (II). Expo... 1
- Which of the following statements are correct?A. An excessive loss of body fluid from the body switches off osmoreceptors.B. ADH facilitates water reabsorption to prevent diuresis.C. ANF causes vasodilation.D. ADH causes increase in blood pressure.E.… Answer: 3. B, C and D only Key idea: Know the effects of ADH and ANF. A is wrong: excessive loss of fluid activates the osmoreceptors, which... 1
- How many different proteins does the ribosome consist of? Answer: 2. 80 Key idea: A ribosome is made of rRNA and about 80 different proteins. This is the figure used in NCERT, so the answer is 80. O... 1
- Which one of the following statements is NOT correct? Answer: 3. Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries. Key idea: Algal blooms caus... 1
- Which of the following statements are correct about Klinefelter's Syndrome?A. This disorder was first described by Langdon Down (1866).B. Such an individual has overall masculine development. However, the feminine development is also expressed.C. The… Answer: 4. B and E only Key idea: Klinefelter's syndrome has the karyotype 47, XXY. A is wrong: Langdon Down described Down syndrome. B is c... 1
- Match List I with List II :List I (Interaction) | List II (Species A and B)A. Mutualism | I. +(A), O(B)B. Commensalism | II. -(A), O(B)C. Amensalism | III. +(A), -(B)D. Parasitism | IV. +(A), +(B)Choose the correct answer from the options given below… Answer: 3. A-IV, B-I, C-II, D-III Key idea: Use the signs for effect on species A and B. Mutualism: +, + (IV). Commensalism: + for A, 0 for... 1
- Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :Assertion A : A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.Reason R : Internode of the shoot… Answer: 2. Both A and R are true and R is the correct explanation of A. Key idea: A flower is a modified shoot in which the shoot apical mer... 1
- Match List I with List II :List I | List IIA. Cohesion | I. More attraction in liquid phaseB. Adhesion | II. Mutual attraction among water moleculesC. Surface tension | III. Water loss in liquid phaseD. Guttation | IV. Attraction towards polar surfac… Answer: 2. A-II, B-IV, C-I, D-III Key idea: Match each term with its meaning. Cohesion: mutual attraction among water molecules (II). Adhesi... 1
- Match List I with List II :List I | List IIA. Oxidative decarboxylation | I. Citrate synthaseB. Glycolysis | II. Pyruvate dehydrogenaseC. Oxidative phosphorylation | III. Electron transport systemD. Tricarboxylic acid cycle | IV. EMP pathwayChoose th… Answer: 1. A-II, B-IV, C-III, D-I Key idea: Match the process with its enzyme or pathway. Oxidative decarboxylation: pyruvate dehydrogenase... 1
- Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of Answer: 2. Succinic dehydrogenase Key idea: Malonate (written "melonate" in the question) is a competitive inhibitor of succinic dehydrogena... 1
- Given below are two statements :Statement I : Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually… Answer: 4. Statement I is correct but Statement II is false. Key idea: Statement I is Gause's principle, which is correct. Statement II is f... 1
- Match List I with List II.List I: A. Gene 'a'; B. Gene 'y'; C. Gene 'i'; D. Gene 'z'List II: I. β-galactosidase; II. Transacetylase; III. Permease; IV. Repressor proteinChoose the correct answer from the options given below: Answer: 3. A-II, B-III, C-IV, D-I Key idea: In the lac operon, each gene codes for a specific protein. Gene i codes for the repressor protei... 1
- Given below are two statements:Statement I: Ligaments are dense irregular tissue.Statement II: Cartilage is dense regular tissue.In the light of the above statements, choose the correct answer from the options given below: Answer: 3. Both Statement I and Statement II are false. Key idea: Check the type of tissue for each structure. Statement I is false: ligamen... 1
- Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.Assertion A: Amniocentesis for sex determination is one of the strategies of Reproductive and Child Health Care Programme.Reason R: Ban on amniocente… Answer: 1. A is false but R is true. Key idea: Amniocentesis is misused to find the sex of the foetus, so it is banned for that purpose. Ass... 1
- Match List I with List II.List I (Type of Joint): A. Cartilaginous Joint; B. Ball and Socket Joint; C. Fibrous Joint; D. Saddle JointList II (Found between): I. Between flat skull bones; II. Between adjacent vertebrae in vertebral column; III. Betwee… Answer: 3. A-II, B-IV, C-I, D-III Key idea: Match each joint with its location. Cartilaginous joint: between adjacent vertebrae (II). Ball a... 1
- Given below are two statements:Statement I: Vas deferens receives a duct from seminal vesicle and opens into urethra as the ejaculatory duct.Statement II: The cavity of the cervix is called cervical canal which along with vagina forms birth canal.In… Answer: 2. Both Statement I and Statement II are true. Key idea: Check each statement against male and female reproductive anatomy. Statemen... 1
- Which one of the following techniques does not serve the purpose of early diagnosis of a disease for its early treatment? Answer: 3. Serum and Urine analysis Key idea: Early diagnosis needs methods that detect a pathogen or a gene before symptoms appear. PCR amp... 1
- Which one of the following common sexually transmitted diseases is completely curable when detected early and treated properly? Answer: 3. Gonorrhoea Key idea: Bacterial STDs can be cured with antibiotics, but viral STDs cannot. HIV, genital herpes and hepatitis-B are... 1
- Which of the following is not a cloning vector? Answer: 1. Probe Key idea: A cloning vector carries foreign DNA into a host and replicates there. BAC (bacterial artificial chromosome), YAC... 1
- Match List I with List II.List I: A. CCK; B. GIP; C. ANF; D. ADHList II: I. Kidney; II. Heart; III. Gastric gland; IV. PancreasChoose the correct answer from the options given below: Answer: 2. A-IV, B-III, C-II, D-I Key idea: Match each hormone with its source. CCK: secreted by the gastrointestinal tract and acts on the... 1
- Which of the following are NOT considered as the part of endomembrane system?A. MitochondriaB. Endoplasmic ReticulumC. ChloroplastsD. Golgi complexE. PeroxisomesChoose the most appropriate answer from the options given below: Answer: 3. A, C and E only Key idea: The endomembrane system includes organelles whose functions are coordinated: ER, Golgi complex, lysosom... 1