Zoology
- Which of the following are not the effects of Parathyroid hormone ?(a) Stimulates the process of bone resorption(b) Decreases Ca^2+ level in blood(c) Reabsorption of Ca^2+ by renal tubules(d) Decreases the absorption of Ca^2+ from digested food(e) In… Answer: 3. (b), (d) and (e) only Key idea: PTH raises blood mathrmCa²⁺ . (a) Stimulates bone resorption: true effect. (b) Decreases blood ma... 1
- Select the incorrect statement regarding synapses : Answer: 1. Impulse transmission across a chemical synapse is always faster than that across an electrical synapse. Key idea: Electrical syna... 1
- Match List - I with List - II with respect to methods of Contraception and their respective actions.List - I: (a) Diaphragms (b) Contraceptive Pills (c) Intra Uterine Devices (d) Lactational AmenorrheaList - II: (i) Inhibit ovulation and Implantation… Answer: 3. (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii) Key idea: Match each method to its action. (a) Diaphragms cover the cervix and blo... 1
- Match List - I with List - II.List - I: (a) Bronchioles (b) Goblet cell (c) Tendons (d) Adipose TissueList - II: (i) Dense Regular Connective Tissue (ii) Loose Connective Tissue (iii) Glandular Tissue (iv) Ciliated EpitheliumChoose the correct answer… Answer: 2. (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii) Key idea: Match each structure with its tissue. (a) Bronchioles: ciliated epitheli... 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
- In the following palindromic base sequences of DNA, which one can be cut easily by particular restriction enzyme ? Answer: 3. 5'GAATTC3'; 3'CTTAAG5' A palindromic site reads the same 5' to 3' on both strands. 5'GAATTC3' with complementary 3'CTTAAG5' is a... 1
- Transposons can be used during which one of the following ? Answer: 3. Gene silencing As per the official key, the answer is gene silencing: transposons (jumping genes) can insert in or near a gene an... 1
- Given below are two statements :Statement I :Restriction endonucleases recognise specific sequence to cut DNA known as palindromic nucleotide sequence.Statement II :Restriction endonucleases cut the DNA strand a little away from the centre of the pal… Answer: 2. Both Statement I and Statement II are correct Key idea: Restriction enzymes recognise palindromic sequences and cut each strand s... 1
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) :All vertebrates are chordates but all chordates are not vertebrates.Reason (R) :Notochord is replaced by vertebral column in the… Answer: 2. Both (A) and (R) are correct and (R) is the correct explanation of (A) Key idea: Chordates have a notochord. In vertebrates it is... 1
- Given below are two statements :Statement I :The coagulum is formed of network of threads called thrombins.Statement II :Spleen is the graveyard of erythrocytes.In the light of the above statements, choose the most appropriate answer from the options… Answer: 1. Statement I is incorrect but Statement II is correct Key idea: The clot is made of fibrin, not thrombin. Statement I: the coagulu... 1
- Nitrogenous waste is excreted in the form of pellet or paste by : Answer: 1. Pavo Key idea: Birds are uricotelic. Their uric acid leaves as a semi-solid pellet or paste, which saves water. Pavo (peacock) is... 1