WB SSC LIFE SCIENCE (IX-X) QUESTION PAPER -2025 WITH ANSWER AND EXPLANATION. EXAMINATION HELD ON 7TH SEPTEMBER 2025. SEE THE ANSWER AND EXPLANATION AND CHECK YOUR SCORE. 1.Volume of air that can be inspired by maximum effort above the tidal volume is called(A) Expiratory Reserve Volume (ERV)(B) Inspiratory Reserve Volume (IRV)(C) Functional Residual Capacity (FRC)(D) Residual Volume (RV) Answer: (B) Inspiratory Reserve Volume (IRV)Explanation: Tidal Volume (TV): Normal breath (~500 ml). Inspiratory Reserve Volume (IRV): Extra air inhaled with maximum effort after tidal inspiration (~2500–3000 ml). Expiratory Reserve Volume (ERV):…
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MOCK TEST 21 LIFE SCIENCE WB SLST
1. Identify the correct match: (A) Obelia – Alternation of generations (B) Aurelia – Polymorphism (C) Fasciola – Nephridia (D) Earthworm – Flame cells 2. In starfish, locomotion is brought about by— (A) Spines (B) Tube feet (C) Tentacles (D) Pedicellaria 3. Birds excrete nitrogen mainly as— (A) Ammonia (B) Urea (C) Uric acid (D) Creatinine 4. Which structure in mammalian brain regulates body temperature? (A) Cerebellum (B) Hypothalamus (C) Medulla (D) Corpus callosum 5. Which is a semi-autonomous organelle? (A) Mitochondria (B) Lysosome (C) Peroxisome (D) Ribosome 6.…
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1. Match the following correctly: Column I (Organism) – Column II (Special Feature) Hydra – (a) Nematocysts Ascaris – (b) Pseudocoelom Fasciola – (c) Miracidium larva Earthworm – (d) Nephridia Options: (A) 1-a, 2-b, 3-c, 4-d (B) 1-b, 2-c, 3-d, 4-a (C) 1-c, 2-a, 3-b, 4-d (D) 1-d, 2-b, 3-a, 4-c 2. Assertion (A): Siphonophores exhibit polymorphism. Reason (R): They have division of labour among zooids. (A) Both A & R are true, and R is the correct explanation. (B) Both A & R are true, but R is…
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1. Polymorphism in Siphonophora is primarily related to—(A) Mode of reproduction(B) Division of labour among zooids(C) Alternation of generations(D) Type of larval stages 2. The respiratory pigment in Arthropods like prawns is—(A) Haemoglobin(B) Haemocyanin(C) Myoglobin(D) Haemoerythrin 3. The water vascular system of starfish opens to the exterior through—(A) Madreporite(B) Ambulacral groove(C) Tube feet(D) Ring canal 4. In Amphibians, the heart is—(A) Two chambered(B) Three chambered(C) Four chambered(D) Five chambered 5. Which snake is non-poisonous?(A) Cobra(B) Krait(C) Rat snake(D) Russell’s viper 6. The aortic arch system in amphibians includes—(A) Three arches(B)…
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1. Which of the following is the most abundant protein in the human body? (A) Hemoglobin(B) Albumin(C) Collagen(D) Keratin 2. DNA replication is described as semi-conservative because: (A) Only one strand is newly synthesized(B) Both strands are conserved(C) Each daughter DNA has one old and one new strand(D) DNA is not conserved during replication 3. Which of the following organelles is responsible for photorespiration? (A) Mitochondria, Glyoxysome and Peroxisome(B) Chloroplast, Peroxisome and Mitochondria(C) Ribosome, Nucleus and Golgi body(D) Chloroplast, Lysosome and Peroxisome 4. Which vitamin deficiency causes “pernicious anemia”? (A)…
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1. Which of the following does NOT serve as an evidence of evolution?(a) Comparative biochemistry(b) Natural selection(c) Fossils(d) Comparative anatomy 2. What is the function of Nissl’s granules?(a) It is a site of lipid synthesis.(b) It is a site of myelin synthesis.(c) It is a site of protein synthesis.(d) It speeds up nerve impulses. 3. The chemicals released in the human body during an anaphylactic shock are:(a) Adrenalines(b) Histamines and serotonins(c) Interferons(d) Complement proteins 4. Which of the following is an example of living fossil?(a) Limulus(b) Culex(c) Locusta(d) Laccifer 5.…
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Mitochondrial DNA is generally inherited through: (A) Maternal line (B) Paternal line (C) Both parents (D) Horizontal transfer Which of the following is a non-protein enzyme? (A) Ribozyme (B) Apoenzyme (C) Holoenzyme (D) Isoenzyme Which bond stabilizes the secondary structure of protein? (A) Ionic bond (B) Hydrogen bond (C) Peptide bond (D) Disulfide bond The fluid mosaic model of plasma membrane was proposed by: (A) Robertson (B) Singer and Nicolson (C) Danielli and Davson (D) Watson and Crick Which organelle is rich in hydrolytic enzymes? (A) Mitochondria (B) Lysosome…
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1. The oxygen dissociation curve of hemoglobin is –(A) Linear(B) Sigmoid(C) Exponential(D) Hyperbolic 2. Night blindness is caused due to deficiency of –(A) Vitamin A(B) Vitamin C(C) Vitamin D(D) Vitamin K 3. Which is the pacemaker of the human heart?(A) AV Node(B) SA Node(C) Bundle of His(D) Purkinje Fibers 4. The universal energy currency of the cell is –(A) ATP(B) ADP(C) AMP(D) GTP 5. The functional unit of kidney is –(A) Nephron(B) Glomerulus(C) Loop of Henle(D) Bowman’s Capsule 6. Which enzyme is called ‘suicidal bag of cell’?(A) Ribosome(B) Lysosome(C) Mitochondria(D)…
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