#neet
- 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
- In-situ conservation refers to : Answer: 2. Protect and conserve the whole ecosystem Key idea: In-situ conservation protects species in their natural habitat, so the whole e... 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
- Given below are two statements :Statement I :Mycoplasma can pass through less than 1 micron filter size.Statement II :Mycoplasma are bacteria with cell wallIn the light of the above statements, choose the most appropriate answer from the options give… Answer: 4. Statement I is correct but Statement II is incorrect Key idea: Mycoplasma are the smallest bacteria and have no cell wall. Statem... 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
- In the taxonomic categories which hierarchial arrangement in ascending order is correct in case of animals ? Answer: 2. Kingdom, Phylum, Class, Order, Family, Genus, Species Key idea: The standard hierarchy is Kingdom, Phylum, Class, Order, Family,... 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
- 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
- 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
- Select the incorrect statement with reference to mitosis : Answer: 3. Spindle fibres attach to centromere of chromosomes. Key idea: Spindle fibres attach to the kinetochores, which are protein discs... 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
- 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
- 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
- If the length of a DNA molecule is 1.1 metres, what will be the approximate number of base pairs ? Answer: 2. 3.3×10⁹ bp Key idea: Distance between two base pairs is 0.34\ nm = 0.34×10⁻⁹ m. N = dfrac1.10.34×10⁻⁹ ≈ 3.2×10⁹ ≈ 3.3×10⁹ bp, whi... 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
- 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
- Which part of the fruit, labelled in the given figure makes it a false fruit ? Answer: 4. C → Thalamus A false fruit develops from parts other than the ovary, here the thalamus. In the figure (apple), the large outer fl... 1
- The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.(a) It is also called as the earlywood(b) In spring season cambium produces xylem elements with narrow vessels(c) It is lighter in colour(… Answer: 3. (a), (c), (d) and (e) Only (a) Springwood is also called earlywood: true. (b) It has wide vessels, not narrow: false. (c) It is l... 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
- 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
- What is the role of large bundle shealth cells found around the vascular bundles in C_4 plants ? Answer: 3. To increase the number of chloroplast for the operation of Calvin cycle The large bundle sheath cells of C₄ plants hold many chlo... 1
- Which of the following occurs due to the presence of autosome linked dominant trait ? Answer: 3. Myotonic dystrophy Myotonic dystrophy is an autosomal dominant disorder. Thalassemia and sickle cell anaemia are autosomal recess... 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
- If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as : Answer: 2. Sequence annotation In the sequence annotation approach, the whole genome is sequenced blindly and functions are assigned to segm... 1