NEET UG
- In an E.coli strain i gene gets mutated and its product can not bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome ? Answer: 4. z, y, a genes will not be translated Key idea: If the repressor (product of the i gene) cannot bind the inducer, it stays bound t... 1
- Given below are two statements :Statement I :Autoimmune disorder is a condition where body defense mechanism recognizes its own cells as foreign bodies.Statement II :Rheumatoid arthritis is a condition where body does not attack self cells.In the lig… Answer: 4. Statement I is correct but Statement II is incorrect Key idea: In autoimmunity the body attacks its own cells; rheumatoid arthrit... 1
- Select the incorrect statement with respect to acquired immunity. Answer: 1. Acquired immunity is non-specific type of defense present at the time of birth. Key idea: Acquired immunity is specific and devel... 1
- In gene therapy of Adenosine Deaminase (ADA) deficiency, the patient requires periodic infusion of genetically engineered lymphocytes because : Answer: 1. Genetically engineered lymphocytes are not immortal cells. Key idea: Lymphocytes are short-lived, so the gene-corrected cells mus... 1
- In which of the following animals, digestive tract has additional chambers like crop and gizzard ? Answer: 1. Pavo, Psittacula, Corvus Key idea: Birds have a crop and a gizzard in the digestive tract. Pavo (peacock), Psittacula (parrot) an... 1
- Natural selection where more individuals acquire specific character value other than the mean character value, leads to : Answer: 3. Directional change Key idea: When more individuals move to one extreme of the trait, away from the mean, the curve shifts one way... 1
- Given below are two statements :Statement I :Fatty acids and glycerols cannot be absorbed into the blood.Statement II :Specialized lymphatic capillaries called lacteals carry chylomicrons into lymphatic vessels and ultimately into the blood.In the li… Answer: 2. Both Statement I and Statement II are correct Key idea: Fatty acids and glycerol are insoluble, so they go into lacteals inside c... 1
- Which of the following is not the function of conducting part of respiratory system ? Answer: 1. Provides surface for diffusion of O₂ and CO₂ Key idea: The conducting part (nose to terminal bronchioles) carries air, but gas ex... 1
- Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver ______ ml of O_2 to the tissues. Answer: 3. 5 ml Key idea: Oxygenated blood has about 20 ml O₂ per 100 ml and deoxygenated blood about 15 ml per 100 ml. Delivered to tissues... 1
- Which of the following is a correct match for disease and its symptoms ? Answer: 2. Arthritis - Inflammed joints Key idea: Check each disease against its true description. Muscular dystrophy is a genetic disorder,... 1
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :Osteoporosis is characterised by decreased bone mass and increased chances of fractures.Reason (R) :Common cause of osteoporosis… Answer: 4. (A) is correct but (R) is not correct Key idea: Osteoporosis is linked to a fall in estrogen, not a rise. (A) is correct: osteopo... 1
- Which of the following statements are true for spermatogenesis but do not hold true for Oogenesis ?(a) It results in the formation of haploid gametes(b) Differentiation of gamete occurs after the completion of meiosis(c) Meiosis occurs continuously i… Answer: 1. (b), (c) and (e) only Key idea: Compare each statement for the two processes. (a) Both give haploid gametes. Not exclusive. (b) I... 1
- Given below are two statements :Statement I :The release of sperms into the seminiferous tubules is called spermiation.Statement II :Spermiogenesis is the process of formation of sperms from spermatogonia.In the light of the above statements, choose… Answer: 4. Statement I is correct but Statement II is incorrect Key idea: Spermiation and spermiogenesis are different steps. Statement I: s... 1
- Which of the following functions is not performed by secretions from salivary glands ? Answer: 1. Digestion of disaccharides Key idea: Salivary amylase digests starch, but no salivary enzyme digests disaccharides. Salivary amyl... 1
- Tegmina in cockroach, arises from : Answer: 3. Mesothorax Key idea: In cockroach, the forewings are tegmina and arise from the mesothorax. The hind wings (membranous) arise fro... 1
- Read the following statements on lipids and find out correct set of statements :(a) Lecithin found in the plasma membrane is a glycolipid(b) Saturated fatty acids possess one or more c=c bonds(c) Gingely oil has lower melting point, hence remains as… Answer: 4. (c), (d) and (e) only (a) Lecithin is a phospholipid, not a glycolipid: false. (b) Saturated fatty acids have no double bonds: fa... 1
- Regarding Meiosis, which of the statements is incorrect ? Answer: 3. DNA replication occurs in S phase of Meiosis-II Key idea: DNA replicates only once in meiosis, in the S phase before meiosis I. M... 1
- Addition of more solutes in a given solution will : Answer: 3. lower its water potential Water potential of pure water is highest (zero). Adding solute lowers the free energy of water, so solu... 1
- Match List - I with List - II.List - I: (a) Metacentric chromosome (b) Acrocentric chromosome (c) Sub-metacentric chromosome (d) Telocentric chromosomeList - II: (i) Centromere situated close to the end forming one extremely short and one very long a… Answer: 2. (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii) Metacentric: centromere in the middle, two equal arms, (iii). Acrocentric: centrom... 1
- Which of the following statements with respect to Endoplasmic Reticulum is incorrect ? Answer: 4. In prokaryotes only RER are present Key idea: Prokaryotes have no endoplasmic reticulum at all, because they lack membrane-bound... 1
- Identify the asexual reproductive structure associated with Penicillium : Answer: 3. Conidia Key idea: Penicillium is a fungus that reproduces asexually by conidia. Conidia are borne on conidiophores, so option 3 i... 1
- Match the plant with the kind of life cycle it exhibits :List - I: (a) Spirogyra (b) Fern (c) Funaria (d) CycasList - II: (i) Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte (ii) Dominant haploid free-living… Answer: 3. (a) - (ii), (b) - (iii), (c) - (iv), (d) - (i) Spirogyra: dominant haploid free-living gametophyte, (ii). Fern: dominant diploid... 1
- The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false ? Answer: 3. The same diesel engine is used in CNG buses making the cost of conversion low The false statement is that the same diesel engine... 1
- Which one of the following will accelerate phosphorus cycle ? Answer: 4. Weathering of rocks Phosphorus comes mainly from rocks, and weathering of rocks releases phosphates into the soil, which speeds u... 1